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Ming-Jay DENG, Pei-Chiung LIN, I-Wen SUN, Po-Yu CHEN, Jeng-Kuei CHANG
2009 年 77 巻 8 号 p.
582-584
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Due to the ligand property of the DCA anion, both CuCl and NiCl
2 are soluble in 1-ethyl-3-methylimidazolium dicyanamide (EMI-DCA) ionic liquid. Cyclic voltammograms of Ni(II), Cu(I), and Ni(II)+Cu(I), respectively, in EMI-DCA were recorded on the glassy carbon electrode at 30°C. It is interesting to note that the thermodynamic deposition potentials of Ni and Cu are very close to each other. This is especially favorable for the electrodeposition of Ni-Cu alloys without any additive. The Ni-Cu alloys were electrodeposited using bulk controlled-potential electrolysis experiments. Energy-dispersive spectroscopy (EDS) data indicates that the composition of the Ni-Cu alloys not only depends on the deposition potential, but also on the Cu(I) and Ni(II) concentrations in the melt.
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Jeng-Kuei CHANG, Su-Yau CHEN, Chien-Hsiung TSENG, Wen-Ta TSAI, Ming-Ja ...
2009 年 77 巻 8 号 p.
585-587
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
A continuous and adhesive Al layer was successfully electrodeposited on a Mg alloy in aluminum chloride/1-ethyl-3-methylimidazolium ionic liquid at room temperature. Surface morphology, crystal structure, and chemical composition of the deposit were examined with a scanning electron microscope, an X-ray diffractometer, and an X-ray energy dispersive spectroscope, respectively. The corrosion resistance of the Al-coated Mg alloy was also evaluated.
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Ming-Jay DENG, Jeng-Kuei CHANG, Tin-Iao LEONG, Szu-Wen FANG, Po-Yu CHE ...
2009 年 77 巻 8 号 p.
588-590
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
This work demonstrates that reticulate Sn film with nano-sized porosity can be obtained simply by direct electrodeposition of Sn nanowires without using any additive and template in a water and air stable ionic liquid, namely 1-ethyl-3-methylimidazolium dicyanamide (EMI-DCA) at 313 K.
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Yufeng YI, Fuchen DING, Wei LI, Minglan GE, Guangzhou JIN, Junbin GAO
2009 年 77 巻 8 号 p.
591-593
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Alkylation reaction of benzene with 1-dodecene was carried out catalyzed by Brønsted acidic ionic liquids. Catalytic ability of different Brønsted acidic ionic liquids was compared. Results showed that sulfonic Brønsted acidic ionic liquids could catalyze the alkylation reaction. Reaction conditions were optimized to get the best conversion.
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Takashi KAMEI, Koshi MITACHI, Yoshio KATO, Kazuo FURUKAWA
2009 年 77 巻 8 号 p.
594-596
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Nuclear energy is reconsidered against global warming but the concerns (nuclear proliferation, radioactive waste, safety etc.) make it difficult to apply widely in the world. To comprehensively solve these difficulties, we have proposed Th-
233U fuel cycle named THORIMS-NES (Thorium molten-salt nuclear energy synergetics). We calculated the mass balance of fissile materials and the production of minor actinide (MA) governing major part of radioactive waste for evaluating the smooth shift to Th-
233U fuel cycle. Th-
233U fuel cycle can generate 3 TWe at around 2050 and 10 TWe at around the end of this century by applying Pu obtained from spent nuclear fuel of conventional nuclear system and
233U produced by Accelerator Molten-Salt Breeders (AMSB).
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Hirohide KOFUJI, Ippei AMAMOTO, Kazuya SASAKI, Masaru YASUMOTO, Yasush ...
2009 年 77 巻 8 号 p.
597-600
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
A phosphate conversion process has been developed to reduce the high-level radioactive waste (HLW) generated in metal-electrorefining. In this study, the results of thermodynamic phosphate conversion reaction calculations are examined experimentally. Rare Earth Element (REE) chlorides were discovered to be easily converted into phosphates. Furthermore, regarding the use of an additive in the phosphate conversion reaction, the high temperature behavior of lithium phosphate was evaluated in elucidating its thermodynamic properties.
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Shunsuke KAWAI, Kei NISHIKAWA, Yasuhiro FUKUNAKA, Shigeo KIDA
2009 年 77 巻 8 号 p.
601-603
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
The transient mass transfer rate of Li
+ ion caused by the electrochemical deposition and dissolution of Li metal in propylene carbonate (PC) and ionic liquid (IL) containing a lithium salt is numerically analyzed. The previous mesurements of transport properties such as diffusion coefficient of a lithium salt and electrolyte viscosity are used in the present calculation. The concentration profile of Li
+ ion developed along electrode surface has been
in-situ measured by holographic interferometry. The measurement values are reasonably compared with the calculations except for the apparent incubation period observed in the initial stage of electrochemical deposition and dissolution.
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Meng-Chang LIN, Jun-Yen UAN
2009 年 77 巻 8 号 p.
604-607
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Electrolysis was conducted in a molten salt containing LiCl and KCl at 500°C for bcc Mg-11.9 wt.% Li-8.5 wt.% Al-0.57 wt.% Zn alloy fabrication. As-rolled Mg-11.9 wt.% Li-8.5 wt.% Al-0.57 wt.% Zn and Mg-2.6 wt.% Al-0.72 wt.% Zn foils were assembled into separate Mg/2 mol kg
−1 MgCl
2/Cu cells. Mg-11.9 wt.% Li-8.5 wt.% Al-0.57 wt.% Zn foil as anode exhibited higher discharge voltage and capacity than Mg-2.6 wt.% Al-0.72 wt.% Zn foil did in the cell.
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Shinya HOSOKAWA, Franz DEMMEL, Wolf-Christian PILGRIM, Masanori INUI, ...
2009 年 77 巻 8 号 p.
608-610
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
In order to investigate the phonon dynamics of molten NaI, inelastic X-ray scattering measurements were preformed near the melting point at the beamline BL35XU of the SPring-8. A fast sound mode exceeding the ultrasonic velocity of sound by about 45% was observed as in other molten alkali halides, which is in fairly good agreement with a scaling formula using the effective mass of the salt constituents.
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Sun-woog KIM, Toshiyuki MASUI, Nobuhito IMANAKA
2009 年 77 巻 8 号 p.
611-613
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Red-emitting phosphors based on gadolinium oxysulfate were synthesized in a single phase form by our original flux method using alkaline metal sulfate such as Na
2SO
4 and the 0.6Li
2SO
4--0.4Na
2SO
4 eutectic mixture, and photoluminescence properties were characterized. Addition of the flux is significantly effective to enhance the emission intensity, and the luminescent peak intensity of Gd
2O
2SO
4: 10%Eu
3+ increased double and triples by using Na
2SO
4 and 0.6Li
2SO
4--0.4Na
2SO
4, respectively. The application of the 0.6Li
2SO
4--0.4Na
2SO
4 eutectic mixture works more effectively because the melting point (600°C) is significantly lower than that of Na
2SO
4 (887°C).
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Takayuki NAGAI, Akihiro UEHARA, Toshiyuki FUJII, Osamu SHIRAI, Nobuaki ...
2009 年 77 巻 8 号 p.
614-616
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Formal redox potentials of the U
4+/U
3+ and U
3+/U couples in molten LiCl-RbCl eutectic were determined by cyclic voltammetry. These redox potentials were more negative than those in the LiCl-KCl eutectic but positive comparing to those in the NaCl-CsCl eutectic. This relation would be correlated with the averaged alkali cation radius.
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Shimpei ONO, Kazumoto MIWA, Shiro SEKI, Junichi TAKEYA
2009 年 77 巻 8 号 p.
617-620
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
We report high-mobility rubrene single-crystal field-effect transistors with ionic-liquid electrolytes used for gate dielectric layers. As the result of fast ionic diffusion to form electric double layers, their capacitances remain more than 1.0 µF/cm
2 even at 0.1 MHz. With high carrier mobility of 9.5 cm
2/Vs in the rubrene crystal, pronounced current amplification is achieved at the gate voltage of only 0.2 V, which is two orders of magnitude smaller than that necessary for organic thin-film transistors with dielectric gate insulators. The results demonstrate that the ionic-liquid/organic semiconductor interfaces are suited to realize low-power and fast-switching field-effect transistors without sacrificing carrier mobility in forming the solid/liquid interfaces.
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Koji NITTA, Masatoshi MAJIMA, Shinji INAZAWA, Toshiyuki NOHIRA, Rika H ...
2009 年 77 巻 8 号 p.
621-623
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
We examined a eutectic Li
2WO
4-Na
2WO
4-K
2WO
4 melt and several its derivative melts at 873 K to develop a stable bath which enables electrodeposition of high quality tungsten. Galvanostatic electrolysis at 25 mA cm
−2 in the eutectic Li
2WO
4-Na
2WO
4-K
2WO
4 melt gave a powdery deposit consisting of both tungsten and tungsten oxide. A dendritic deposit of tungsten was obtained from a Li
2WO
4-Na
2WO
4-K
2WO
4-LiCl-NaCl-KCl melt, which has a lower viscosity, in the same electrolysis condition. The dendrite formation was completely suppressed by vibrating the electrode during the electrodeposition. However, the surface was covered with large and angular crystal grains. By addition of KF to the melt, the size of the crystal grains became much smaller and smooth surface was obtained. The XRD analysis and cross-sectional SIM observation revealed that the addition of KF suppressed the preferential growth of α-W crystal and gave the mixture of α-W and β-W resulting in smaller crystal grain size.
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Junya OHTSUKI, Kazuhiko MATSUMOTO, Rika HAGIWARA
2009 年 77 巻 8 号 p.
624-626
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Physical and electrochemical properties of 1-ethyl-3-methylimidazolium ionic liquids of mixed anions, (FH)
2.3F
−, BF
4−, and N(SO
2CF
3)
2−, have been investigated. Molar volume shows almost linear behavior, whereas molar conductivity is decreased by mixing for the systems involving (FH)
2.3F
− due to the enhancement of ion association in spite of the decrease in viscosity. The currents at the anode and cathode limits in the cyclic voltammogram of EMIm(FH)
2.3F decreases with decrease in the molar ratio of (FH)
nF
−, suggesting the involvement of (FH)
nF
− for both electrode reactions. Electrochemical stability of the BF
4-TFSA mixture is unchanged by mixing.
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Saburo KOSHIZAWA, Yasushi KATAYAMA, Takashi MIURA
2009 年 77 巻 8 号 p.
627-629
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Photoelectrochemical behavior of a single crystal n-TiO
2 electrode was investigated in a hydrophobic room temperature ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA). The photoanodic current was observed on the TiO
2 electrode in BMPTFSA under irradiation of UV light. The flat-band potential was estimated from the onset potential of the photocurrent. The flat-band potential in neat BMPTFSA was different from that in BMPTFSA containing ferrocene.
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Nobuyuki SERIZAWA, Naoki TACHIKAWA, Yasushi KATAYAMA, Takashi MIURA
2009 年 77 巻 8 号 p.
630-632
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
EQCM (Electrochemical Quartz Crystal Microbalance) measurement during Sn(II)/Sn electrode reaction in a room-temperature ionic liquid was conducted using an impedance method EQCM, which can measure the resonance resistance and frequency simultaneously. The mass increased during Sn deposition and decreased during Sn dissolution. The viscosity and density of the electrolyte near the electrode, η
Lρ
L, can be estimated by monitoring the resonance resistance. The change of the η
Lρ
L value during Sn(II)/Sn electrode reaction could be accounted for by the concentration profile of Sn(II) near the electrode.
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Toshihide TAKENAKA, Keisuke IWASA, Yoshifumi HASHIGAYA, Masanobu IZAKI
2009 年 77 巻 8 号 p.
633-635
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
The anodic behaviors of Pd, Pt and Au have been investigated in LiCl-KCl eutectic melt at 683 K. Chemical reduction of the dissolved noble metal ions by H
2 and CH
4 has been also carried out. It was shown that Pd and Au could be dissolved anodically with a large dissolution rate, and that the dissolution rate of Pt was limited because of its passivation behavior. Fine particles of these noble metals were obtained by H
2 or CH
4 reduction though they combined together.
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Toshimasa SUZUKI, Ken-ichi OKAZAKI, Tomonori KIYAMA, Susumu KUWABATA, ...
2009 年 77 巻 8 号 p.
636-638
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Sputter deposition of silver (Ag) onto an ionic liquid (IL) produced Ag nanoparticles whose size was varied greatly dependent on the sputtering conditions. Change in discharge current from 10 to 40 mA increased Ag particle size from 5.7 to 11 nm, though prolongation of sputtering time simply caused a higher concentration of Ag nanoparticles in IL without change in their size. Sputter deposition of Ag onto IL solutions containing HAuCl
4 resulted in the appearance of a single surface plasmon resonance peak in the absorption spectra of the resulting solution, and their peak position was red-shifted with an increase in the concentration of HAuCl
4. The obtained results clearly indicated that Ag metal species sputter-deposited in IL can reduce HAuCl
4 to give AuAg alloy nanoparticles and that their chemical composition varies depending on the initial concentration of HAuCl
4.
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Tsubasa MIGITA, Naoki TACHIKAWA, Yasushi KATAYAMA, Takashi MIURA
2009 年 77 巻 8 号 p.
639-641
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Reaction entropies of some metal complex redox couples in an amide-type room-temperature ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA) have been estimated by measuring the thermoelectromotive force at a non-isothermal cell. It is suggested that the reaction entropy is dependent on the difference in the charge densities of the oxidant and reductant of a redox couple, probably related to the coulombic interaction between the redox species and the ions composing the ionic liquid.
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Naoki TACHIKAWA, Yasushi KATAYAMA, Takashi MIURA
2009 年 77 巻 8 号 p.
642-644
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
The electrochemical and spectroscopic properties of divalent and trivalent europium species have been investigated in a hydrophobic room-temperature ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA). The diffusion coefficients of Eu(II) and Eu(III) estimated by chronoamperometry were (3.9±0.4)×10
−8 and (4.2±0.7)×10
−8 cm
2 s
−1, respectively. The diffusion of Eu(II) is affected by the coordination between Eu(II) and TFSA
−. The TFSA
− ligand seems to act as a weaker ligand than CH
3OH according to the splitting of the 5d levels observed from the absorption spectrum for Eu(II). The emission spectra of Eu(II) and Eu(III) were also obtained in BMPTFSA.
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Tomomi MURAKAMI, Yoshihisa KOGO, Kiminori WAKU, Hidetaka HAYASHI, Akir ...
2009 年 77 巻 8 号 p.
645-646
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
The electrodeposition of silver was investigated with 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] amide containing Ag-TFSI at 150°C. The influence of current density on the morphology of the silver deposit was studied by cyclic voltammetry and scanning electron microscopy. The size of the silver crystallite became smaller and dendrite-like growth was suppressed with increasing current density.
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Yasushi KUNIHIRO, Yasushi KATAYAMA, Takashi MIURA
2009 年 77 巻 8 号 p.
647-648
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Anodic oxidation of methanol was investigated at a Pt electrode in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA) room temperature ionic liquid. It was found that methanol can be oxidized electrochemically in the ionic liquid without water. The oxidation products were identified as dimethoxymethane and proton by gas chromatography and electrochemical measurements. The further oxidation of dimethoxymethane was also suggested by cyclic voltammetry.
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Taro TODA, Takehiro MARUYAMA, Kimikazu MORITANI, Hirotake MORIYAMA, Hi ...
2009 年 77 巻 8 号 p.
649-651
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
The distribution coefficients of Am and Ce were measured in the eutectic LiCl-KCl/liquid Ga system at 773K. By using ZrCl
4 as the oxide ion scavenger in order to avoid the formation of such oxychlorides as MO
(n−2)+, the effect of oxide ion concentration was well controlled on the distribution coefficients of Am and Ce. The separation factor between Am and Ce was then obtained to be about 100. By comparing the present value with the other experimental and the predicted ones, it was confirmed that the Ga system was more selective than the Bi and Cd system.
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Minato EGASHIRA, Nobuko YOSHIMOTO, Masayuki MORITA
2009 年 77 巻 8 号 p.
652-655
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
The influence of ethylene carbonate (EC) addition in the lithium salt solution of the ionic liquids based on 1-ethyl-3-methyl imidazolium (EMI) and hexyltrimethyl ammonium (HTMA) cations on the electrochemical properties of the gel polymer electrolyte containing the solutions and a polymer matrix with poly(ethylene oxide) side chain has been investigated. The addition of EC improves the conductivity of the gel electrolyte regardless the kind of ionic liquid component. In contrast, the contribution of EC on the interface behavior toward lithium negative electrode is different by the kind of the ionic liquid. The EC addition in the gel electrolyte containing HTMA-based ionic liquid modifies the rate for reversible deposition-dissolution of lithium, while the effect of EC addition in the gel electrolyte containing EMI-based ionic liquid is distinct for the reaction of negative electrode.
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Zhongning SHI, Junli XU, Zhaowen WANG, Bingliang GAO
2009 年 77 巻 8 号 p.
656-658
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
In this paper, electrolysis tests were carried out for analyzing the gas purities evolving from the cup-shaped Fe-Ni-Al
2O
3 anodes, which were made by slip casting. The oxygen purity of the collecting anodic gas detected by Orsat apparatus was in an interval of 98–100%. SEM and XRD results showed that Fe-Ni-Al
2O
3 anode surface formed a layer that consisted of FeAl
2O
4, NiO, and Al
2O
3 mainly, as well as small amounts of metal phase Ni
3Al.
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Mikito UEDA, Shoh TSUCHIYA, Toshiaki OHTSUKA
2009 年 77 巻 8 号 p.
659-662
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
The electrodeposition of Sb-Bi-Te alloy in AlCl
3-NaCl-KCl molten salt containing SbCl
3, BiCl
3, and TeCl
4 at 423 K was carried out under constant potential control and potential pulse control in the melt. The electrodeposition results show that the SbCl
3 concentration is effective to control the composition of Bi-Sb-Te ternary alloy. The electrodeposited Bi
0.5Sb
1.5Te
3 by pulse electrolysis with frequency=100 Hz and D. R. (Duty Ratio)=75%, had good crystallinity and the preferential orientation of the electrodeposit was the (110) plane in this electrodeposition experiments. The electrodeposit had homogeneous disk-like granules. The power factor of the electrodeposit was calculated as 3×10
−5 Wm
−1 K
−2 from the Seebeck coefficient and the electrical conductivity.
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Xue KANG, Qian XU, Sujuan MA, Lina ZHAO, Qiushi SONG
2009 年 77 巻 8 号 p.
663-666
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
LaNi
5 alloy powders were prepared by electro-deoxidation of the oxide precursors in a eutectic CaCl
2-NaCl melt at 850°C. The reduction pathway from the mixture of La
3Ni
2O
7 and NiO to LaNi
5 was studied by examination of partially reduced samples using XRD, SEM and EDX analysis, which were obtained by interrupting the reduction process after different reduction times. The first stage of the reaction involved the rapid formation of Ni and of LaOCl, then LaOCl and La
2O
3 were electrochemically reduced and alloyed with Ni particles nearby along with their surface. The morphology of LaNi
5 particles reduced for the different durations of reduction can be changeable.
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Toshiyuki FUJII, Akihiro UEHARA, Takayuki NAGAI, Tack-Jin KIM, Nobuaki ...
2009 年 77 巻 8 号 p.
667-669
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Electronic absorption spectra of tetravalent uranium in LiCl and CsCl were measured. Redox potentials of U
4+/U
3+ and U
3+/U
0 couples were estimated by cyclic voltammetry. By adding SrCl
2 into the melts, changes in absorption spectra and cyclic voltammograms were seen. The effect of the coexisted Sr
2+ on the coordination circumstance of uranium ions was discussed.
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Hee-Jung IM, Yong-Kwang JEONG, Young-Hwan CHO, Jun-Gill KANG, Kyuseok ...
2009 年 77 巻 8 号 p.
670-672
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Laser-induced fluorescence was applied for the detection of lanthanide ions such as Tb
3+ and Sm
3+ in a pyrochemical processing. The fluorescence signals of Tb
3+ and Sm
3+ in LiCl-KCl molten salts were successfully observed at room temperature. Moreover, the fluorescence method was identified to be sensitive enough to detect a trace of Eu
2+, originated from a reduction of Eu
3+ contained in a LiCl-KCl eutectic reagent at a given high temperature molten salt condition. The non-destructive and direct fluorescence measurement can be an alternative method in on-line and
in situ determination of the species and concentrations of lanthanides in a molten salt along with absorption measurement.
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Hirokazu HAYASHI, Hiroki SHIBATA, Mitsuo AKABORI, Yasuo ARAI, Kazuo MI ...
2009 年 77 巻 8 号 p.
673-676
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
R&D of the nitride fuel cycle technology is underway at Japan Atomic Energy Agency (JAEA). Behavior of americium (Am) in the pyrochemical process, which includes anodic dissolution of AmN and recovery of Am into a liquid cadmium (Cd) cathode by electrolysis in LiCl-KCl eutectic melts, and nitride formation of Am recovered in liquid Cd, is presented.
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Akira ITO, Kuniaki MURASE, Takashi ICHII, Hiroyuki SUGIMURA
2009 年 77 巻 8 号 p.
677-679
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Cu-Sn speculum alloy metallization of a non-conductive epoxy substrate was demonstrated through successive electrochemical processes: (
i) electroless Cu deposition on the substrate and (
ii) electrochemical alloying of the resulting Cu layer with Sn through a reduction-diffusion method using an ionic liquid bath at 150°C. The resulting Cu-Sn alloy layer, composed of Cu
6Sn
5 and/or Cu
3Sn phases, was compact, smooth, and adhesive. Dependence of the intermetallic phases on alloying potential and time was examined to discuss the alloy formation mechanism, demonstrating that Cu-Sn alloy layers composed of desired phases could easily be prepared by controlling these parameters.
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Nobumitsu HIRAI, Tomohiko YOKOGAWA, Toshihiro TANAKA
2009 年 77 巻 8 号 p.
680-682
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Au(100) single crystal surfaces were investigated using in-situ electrochemical atomic force microscopy (EC-AFM) in 1-butyl-3-methyl-imidazolium tetrafluoroborate (BMImBF
4) and 1-butyl-3-methyl-imidazolium bis (trifluoromethanesulfonyl) imide (BMImTFSI). The protrusions with four-fold symmetry and interatomic distances of 0.3 nm were observed in the potential range from −0.42 to +0.68 V (vs. Fc/Fc
+ electrode) in BMImBF
4 and from −0.35 to +1.06 V in BMImTFSI. These observations corresponded to a bare and unreconstructed Au(100)-(1×1) structure. The top layer of the multi-layered island on Au(100) collapsed at a constant decay rate in both BMImBF
4 and BMImTFSI and is consistent with previously reported for EMImBF
4, EMImTFSI, and a sulfuric acid aqueous solution.
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Yusaku NISHIMURA, Toshiyuki NOHIRA, Takayuki MORIOKA, Rika HAGIWARA
2009 年 77 巻 8 号 p.
683-686
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Electrochemical reduction of silicon tetrachloride has been investigated in an equimolar
N-ethyl-
N-methylpyrrolidinium chloride-zinc chloride melt at 423 K for low-cost production of silicon thin films. A dark-brown substance was formed preferentially on the Ni substrate near the electrode-gas-melt three-phase interface by potentiostatic electrolysis at 0 V vs Zn(II)/Zn. Both energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy suggested that some SiCl
4 was electrochemically reduced to amorphous Si in the present system. Cross-sectional observation of electrodeposited films by scanning electron microscopy suggested that the deposition rate in the present system is about 100-fold higher than that in the room-temperature system investigated in our previous study. Contrivances of the electrode configuration and the SiCl
4-supplying method enabled electrodepositing the Si-containing film on almost the whole Ni substrate.
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Toshiyuki NOHIRA, Kan KITAGAWA, Rika HAGIWARA, Koji NITTA, Masatoshi M ...
2009 年 77 巻 8 号 p.
687-689
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
A new molten salt system,
N-ethyl-
N-methylpyrrolidinium chloride (EMPyrCl)-ZnCl
2, was investigated for the electrodeposition of molybdenum at intermediate temperature. A phase diagram was constructed for the EMPyrCl-ZnCl
2 system, which shows the lowest melting point of 45°C at an equimolar composition. A thermal gravimetry indicated that thermal decomposition starts from 230°C for the equimolar melt. The viscosity and conductivity of the equimolar melt were 75 cP and 22 mS cm
−1, respectively, at 150°C. The cathode limit of the equimolar melt was confirmed to be the deposition of metallic zinc by XRD analysis. A smooth metallic molybdenum film was electrodeposited on a nickel substrate by potentiostatic electrolysis at 0.01 V vs. Zn(II)/Zn in an equimolar melt containing MoCl
5 (0.9 mol%) and KF (3.0 mol%) at 150°C.
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Shiro SEKI, Nobuo KIHIRA, Takeshi KOBAYASHI, Yo KOBAYASHI, Yuichi MITA ...
2009 年 77 巻 8 号 p.
690-692
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Vinyl group-substituted room-temperature ionic liquids (RTILs) were used for aiming at fabrication of high-safety batteries. The imidazolium-based ionic liquids used in this study had a vinylmetylene group and another alkyl group on an imidazolium cation. The charge-discharge profiles of batteries composed of a LiCoO
2 cathode were compared between the different RTILs to know the factors of RTIL influencing the battery performances. The charge/discharge efficiency of a graphite anode was also investigated for total evaluation of the battery performances.
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Tetsuya TSUDA, Takasuke KURIHARA, Yasunori HOSHINO, Tomonori KIYAMA, K ...
2009 年 77 巻 8 号 p.
693-695
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
Platinum (Pt) nanoparticles were synthesized with room-temperature ionic liquid (RTIL)-sputtering method under dry N
2 or Ar atmosphere. The resulting Pt nanoparticles were well-dispersed in trimethyl-
n-propylammonium bis((trifluoromethyl)sulfonyl)amide RTIL without any additive like dispersant. Electrocatalytic activity of the Pt nanoparticles embedded on a glassy carbon electrode (GCE) toward oxygen reduction reaction was examined. It was then found that the catalytic activity increases with increment of heat temperature for embedding the Pt nanoparticles onto GCE if the nanoparticles are synthesized under Ar atmosphere.
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Toshinori SUGIMOTO, Yosuke ATSUMI, Norihisa HANDA, Masaki YAMAGATA, Mi ...
2009 年 77 巻 8 号 p.
696-698
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
The electrochemical behavior of a graphitized electrode was investigated in a room-temperature ionic liquid based on bis(fluorosulfonyl)imide (FSI
−) with the addition of propylene carbonate (PC) or vinylene carbonate (VC). The reversible, significant lithium-ion (Li
+) insertion/extraction was observed in the additive-free FSI-based ionic liquid, while the additive systems showed weak, reversible responses (VC) and degraded responses (PC). AC impedance measurements suggested that the presence of FSI
− extremely reduces the electrode/electrolyte interface impedance, which allows Li
+ to intercalate into a graphitized electrode reversibly. By contrast, the addition of VC inhibits the reversible Li
+ intercalation in spite of FSI
− existence.
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Mi Lin ZHANG, Yong De YAN, Wei HAN, Yun XUE, Xiao Yan JING, Xiu Ling L ...
2009 年 77 巻 8 号 p.
699-701
発行日: 2009/08/05
公開日: 2012/03/22
ジャーナル
フリー
This work presents an electrochemical preparation routine of Mg-Li-Y alloys by codeposition of Mg, Li, and Y on a molybdenum electrode in LiCl-KCl-MgCl
2-YCl
3 melts at 943 K. Cyclic voltammograms (CVs) showed that the underpotential deposition (UPD) of yttrium on pre-deposited magnesium leads to the formation of a liquid Mg-Y solution. Chronopotentiometric measurements indicated that the codeposition of Mg, Li, and Y occurs at current density more negative −0.47 A cm
−2. Mg-Li-Y alloys with different lithium contents were obtained via galvanostatic electrolysis.
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