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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Charge transfer coefficient ： ウィキペディア英語版 Charge transfer coefficient Charge transfer coefficient, and symmetry factor (symbols ''α'' and ''β'', respectively) are two related parameters used in description of the kinetics of electrochemical reactions. They appear in the Butler-Volmer equation and related expressions. The symmetry factor and the charge transfer coefficient are dimensionless.〔IUPAC. "Quantities, Units and Symbols in Physical Chemistry" ("The Green Book"), 2nd edition, Blackwell Science, 1993. ((on line) )〕 According to an IUPAC definition,〔IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. . (Entry: "Cathodic transfer coefficient". )〕 for a reaction with a single rate-determining step, the charge transfer coefficient for a cathodic reaction (the cathodic transfer coefficient, ''αc'') is defined as: :$\backslash frac\; =\; -\; \backslash left(\backslash frac\; \backslash right)\; \backslash left(\; \backslash frac\; \backslash right)\_\; =\; \backslash left(\; \backslash frac\; \backslash right)\; \backslash left(\; \backslash frac\; \backslash right)\_\{T,p,c\_\{i,interface\}\}$ where: *$\backslash nu$: stoichiometric number, i.e., the number of activated complexes formed and destroyed in the overall reaction (with n electrons) * $R$: universal gas constant * $T$: absolute temperature * $n$: number of electrons involved in the electrode reaction * $F$: Faraday constant * $E$: electrode potential * $I$: partial cathodic (anodic) current〔http://goldbook.iupac.org/P04407.html〕〔IUPAC. ''ELECTRODE REACTION ORDERS, TRANSFER COEFFICIENTS AND RATE CONSTANTS. APPLICATION OF DEFINITIONS AND RECOMMENDATIONS FOR PUBLICATION OF PARAMETERS.'' Pure & Appi. Chern., Vol. 52, pp.233—240, 1979. ((pdf) )〕 ==Significance== The charge transfer coefficient signifies the fraction of the interfacial potential at an electrode-electrolyte interface that helps in lowering the free energy barrier for the electrochemical reaction. The electroactive ion present in the interfacial region experiences the interfacial potential and electrostatic work is done on the ion by ''a part'' of the interfacial electric field. It is charge transfer coefficient that signifies ''this part'' that is utilized in activating the ion to the top of the free energy barrier. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Charge transfer coefficient」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.