Electrochemistry

展望

研究で「時間を思い描く」

村越敬

2015 年 83 巻 7 号 p. 525
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.525

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コミュニケーション

Organic Field-effect Transistors Based on Alkylphenyl-substituted Dinaphtho[2,1-b:2′,1′-f]thieno[3,2-b]thiophenes

Yoshihito KUNUGI, Yuki FUJITA, Masanori TSUTSUI, Kazuo OKAMOTO

2015 年 83 巻 7 号 p. 526-528
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.526

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We investigated the characteristics of organic thin-film transistors based on alkylphenyl-substituted dinaphtho[2,1-b:2′,1′-f]thieno[3,2-b]thiophenes (21DNTT) called 4,4′-nP-21DNTT and 6,6′-nP-21DNTT. We found that field-effect characteristics were strongly influenced by the position of the alkyl substituent on the 21DNTT core. An optimal field-effect mobility of 0.46 cm² V⁻¹ s⁻¹ was obtained for the 6,6′-8P-21DNTT-based transistor.

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Electron Extraction from an Extracellular Electrode by Desulfovibrio ferrophilus Strain IS5 Without Using Hydrogen as an Electron Carrier

Xiao DENG, Ryuhei NAKAMURA, Kazuhito HASHIMOTO, Akihiro OKAMOTO

2015 年 83 巻 7 号 p. 529-531
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.529

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We report that an intensely iron-corroding microbe, Desulfovibrio ferrophilus strain IS5, is capable of extracting electrons from an indium tin-doped oxide electrode without consuming electrochemically generated hydrogen as an electron carrier. When sulfate was presented as a metabolic electron acceptor, significant cathodic current production was observed at an onset potential of −200 mV vs. SHE, which was approximately 750 mV more positive than the onset for hydrogen evolution in our experimental condition. This finding indicates that hydrogen is not required for the cathodic reaction of IS5, suggesting that IS5 accelerates anaerobic iron corrosion through direct electron uptake.

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報文

Evaluation of Apparent Standard Potentials of Curium in LiCl-KCl Eutectic Melt

Hiroki SHIBATA, Hirokazu HAYASHI, Tadafumi KOYAMA

2015 年 83 巻 7 号 p. 532-536
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.532

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Electrochemical properties of curium (Cm-244) dissolved in LiCl-KCl eutectic melt were studied in the temperature range of 718–823 K. A small electrochemical cell used in the present study was designed to measure electrochemical properties of highly radioactive Cm-244, the maximum handling amount of which is 30 mg in our hot cells, dissolved in molten salts. Apparent standard potentials of Cm³⁺/Cm couple obtained in the present study, E^°* (Cm³⁺/Cm) = (−3.236 ± 0.011) + (4.86 ± 0.14) × 10⁻⁴ T, reasonably agree with Osipenko’s data (2011) and are lower than Martinot’s data (1975). The validity of the data obtained in the present study was discussed by comparing with the reported data of other transuranic elements.

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A Novel Aminoalkyldisiloxane Compound as a Film-Forming Electrolyte Additive for Graphite Anode

Jinglun WANG, Xinyue ZHAO, Hao LUO, Jianwen YANG, Yoshioka MAKOTO, Lin ...

2015 年 83 巻 7 号 p. 537-540
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.537

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An aminoalkyldisiloxane compound, (2-(N,N-dimethylamino)ethoxy)propyl pentamethyldisiloxane (DSC3N1), was investigated as a film-forming electrolyte additive for graphite anode. The graphite/Li cells with 1 vol% DSC3N1 addition exhibited superior electrochemical performances compared with those in the base electrolyte (1 M LiPF₆ in EC/DEC; v/v = 1/1). The film-forming capability of DSC3N1 on the surface of graphite was investigated by scanning electron microscope, energy dispersive spectroscope, and FT-IR analysis. A comparative hydrolysis experiment of the electrolyte with/without DSC3N1 additive using ¹⁹F-NMR technique demonstrates that DSC3N1 exhibited acid scavenging property and inhibited the hydrolysis of LiPF₆.

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Study on the Temperature Dependence of Pitting Behaviour of AISI 4135 Steel in Marine Splash Zone

Yu XIUMING, Huang YANLIANG, Amar Prasad YADAV, Qu WENJUAN, Roland DE M ...

2015 年 83 巻 7 号 p. 541-548
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.541

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The corrosive condition at marine splash zone is detrimental to steel structures of offshore applications. The corrosion at splash zone is the most serious not only for uniformed corrosion but also localized corrosion. Practically, marine structures experience cyclic seasonal temperature change. Temperature acts as an important factor affecting corrosion process. In this paper, the effects of temperature on pitting behavior of a low alloy high strength steel (AISI 4135) in marine splash zone have been investigated using electrochemical techniques and morphology observations. The area of hysteresis loop was greater under seawater film at lower temperatures than that at high temperatures, indicating that the pitting corrosion sensitivity is high at lower temperature. AISI 4135 steel has the potential danger of pitting corrosion in marine splash zone after long exposure.

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Microbubble Formation from Ionic Vacancies in Copper Anodic Dissolution under a High Magnetic Field

Yoshinobu OSHIKIRI, Ryoichi AOGAKI, Makoto MIURA, Atsushi SUGIYAMA, Ry ...

2015 年 83 巻 7 号 p. 549-553
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.549

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Ionic vacancies created in copper anodic dissolution has been firstly observed by the conversion to microbubbles using both of cyclotron effect and pinch effect under a vertical magnetic field; in a circulating solution induced by Lorentz force, ionic vacancies collide with each other, changing to nanobubbles. Then, the circulation of the nanobubbles with solution makes further collisions, yielding microbubbles. Based on this result, the lifetimes of ionic vacancy formed in copper electrodeposition were finally determined.

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ノート

ステンレススチールのアーク溶接とレーザービーム加工により生じる変色部位の比較

北折典之, 吉岡里紗, 大西則彦

2015 年 83 巻 7 号 p. 554-556
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.554

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The removal of stainless steel discoloration caused by the laser beam was tried using a scale remover with the arc-welding, but it was not removed. Therefore, comparison analysis about a color change of the stainless steel surface with the laser beam and the arc-welding was investigated. As a result, the main composition of discoloration caused by the arc-welding was Fe₂O₃ and that of the laser beam processing was Fe₃O₄. And the thickness of oxidation layer caused by the laser beam was 17 times of that of the arc-welding.

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受賞特集

電気化学会各章表彰

2015 年 83 巻 7 号 p. 557-565
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.557

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加藤記念講演

水素エネルギー時代に向けた電気化学

太田健一郎

2015 年 83 巻 7 号 p. 566-569
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.566

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チュートリアル電気化学測定法

腐食防食の基礎と測定法(5)　腐食による遅れ破壊と鋼中水素の電気化学測定

坂入正敏, 大塚俊明

2015 年 83 巻 7 号 p. 570-575
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.570

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Salon

電気化学への入口

清野美勝

2015 年 83 巻 7 号 p. 576-577
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.576

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海外留学・滞在記

長谷川丈二

2015 年 83 巻 7 号 p. 578-579
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.578

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会告

2015 年 83 巻 7 号 p. 580-587
発行日: 2015/07/05
公開日: 2015/07/05

DOIhttps://doi.org/10.5796/electrochemistry.83.580

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次号予告

2015 年 83 巻 7 号 p. 588
発行日: 2015/07/05
公開日: 2023/12/27

DOIhttps://doi.org/10.5796/electrochemistry.83.588

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