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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 Palladium-hydrogen electrode ： ウィキペディア英語版 Palladium-hydrogen electrode The palladium-hydrogen electrode (abbreviation: Pd/H2) is one of the common reference electrodes used in electrochemical study.〔(Operation principle of Pd/H2 reference electrode )〕 Most of its characteristics are similar to the standard hydrogen electrode (with platinum). But palladium has one significant feature—the capability to absorb (dissolve into itself) molecular hydrogen.〔(A palladium-hydrogen probe electrode for use as a microreference electrode )〕〔(Palladium-hydrogen electrodes for coulometric titration )〕 ==Electrode operation== Two phases can coexist in palladium when hydrogen is absorbed: *alpha-phase at hydrogen concentration less than 0.025 atoms per atom of palladium *beta-phase at hydrogen concentration corresponding to the non-stoichiometric formula PdH0.6 The electrochemical behaviour of a palladium electrode in equilibrium with H3O+ ions in solution parallels the behaviour of palladium with molecular hydrogen :$\backslash tfrac\; \backslash mathrm\_2\; =\; \backslash mathrm\_\; =\; \backslash mathrm\_$ Thus the equilibrium is controlled in one case by the partial pressure or fugacity of molecular hydrogen and in other case—by activity of H+-ions in solution. :$E=E^0\; +\; \backslash ln\; \backslash over\; (\backslash frac\})^\}$ When palladium is electrochemically charged by hydrogen, the existence of two phases is manifested by a constant potential of approximately +50 mV compared to the reversible hydrogen electrode. This potential is independent of the amount of hydrogen absorbed over a wide range. This property has been utilized in the construction of a palladium/hydrogen reference electrode. The main feature of such electrode is an absence of non-stop bubbling of molecular hydrogen through the solution as it is absolutely necessary for the standard hydrogen electrode. 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「Palladium-hydrogen electrode」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.