Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
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74 巻 , 12 号
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  • Takashi KAKIUCHI, Naoya NISHI
    74 巻 (2006) 12 号 p. 942-948
    公開日: 2012/03/20
    ジャーナル オープンアクセス
    A room-temperature ionic liquid (RTIL) consisting of hydrophobic cations and anions forms a two-phase system with water (W). The interface between the RTIL and W is inevitably electrified because of the dissolution of cations and anions constituting the RTIL into the W phase and the two-phase system should, hence, be considered as a new electrochemical system where the phase-boundary potential across the RTIL|W interface plays a key role in determining physicochemical properties of the two-phase system, notably the interfacial charge transfer and the structure of the electrical double layers at the interface. When the solubility of the RTIL in W is on the order of a few mmol dm−3 or higher, the RTIL|W interface behaves as an electrochemically nonpolarized interface; the phase-boundary potential is determined by the composition of the two phases. At the opposite extreme where the solubility is a few tens µmol dm−3 or lower, the interface can be taken as an electrochemically polarized interface, since the phase-boundary potential can be controlled by externally applying a voltage across the two terminals of the cell that comprises the RTIL|W interface. This electrochemical polarizability allows us to employ a variety of electrochemical techniques for studying the RTIL|W interface. Electrochemical view points as well as electrochemical techniques are powerful in clarifying the unique properties of this new electrified interface. Conversely, this two-phase system poses us intriguing problems, which can in turn widen the scope of electrochemistry.
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  • Junichiro MIZUSAKI, Hiroyuki OHAMA, Keiji YASHIRO, Tatsuya KAWADA
    74 巻 (2006) 12 号 p. 949-955
    公開日: 2012/03/20
    ジャーナル オープンアクセス
    A concept of chemical potential pumping effect was introduced to describe the NOx sensing mechanism of oxide catalysts with high electronic conductivity and large carrier density. When NOx gas in a gas-stream decomposed on the surface of the catalyst oxides continuously, the high oxygen potential released by the decomposition of NOx stationarily covered the whole surface of the oxide. Then, the bulk oxide was equilibrated with the steady-state high oxygen potential of the surface, which was much larger than that determined by the oxygen pressure of the surrounding gas-phase. This effect was confirmed by the conductivity enhancement of La2CuO4 and La0.5Sr0.5FeO3 with NO2 as well as nonstoichiometry variation of La0.5Sr0.5CoO3 and EMF of galvanic cell with La0.6Sr0.4CoO3−d. It was shown that the chemical potential pumping effect appears essentially on dense materials while the effect is hardly observed on porous material with large surface relative. On La0.5Sr0.5FeO3 as well as on La2CuO4, NO2 was found to decompose into NO and O2, while NO was almost inactive on these oxides.
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電気化学:測定と解析のてびき
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