A non-precious metal bifunctional oxygen electrode for alkaline anion exchange membrane cells

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• 作者：Xu Wu ; Keith Scott ; ^{k.scott@ncl.ac.uk}
• 关键词：Bifunctional oxygen electrode ; Oxygen reduction reaction ; Oxygen evolution reaction ; Regenerative fuel cells ; Electrolysis ; Alkaline anion exchange membrane
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 May, 2012
• 卷：206
• 期：Complete
• 页码：14-19
• 文件大小：1121 K

摘要

An initial study of a non-precious metal based bifunctional oxygen electrode for use in regenerative fuel cells with alkaline anion exchange membranes is described. Four nanometer size Cu_xMn_0.9鈭?em>xCo_2.1O₄ samples (x = 0, 0.3, 0.6, and 0.9) were prepared and characterized with XRD, SEM, TEM, and cyclic voltammetry. The Cu_xMn_0.9鈭?em>xCo_2.1O₄ samples exhibited promising ORR and OER catalytic activities. The gap between ORR half wave potentials of Pt/C and Cu_xMn_0.9鈭?em>xCo_2.1O₄ in 1 M KOH achieved only 50 mV. The onset potentials for OER on Cu_xMn_0.9鈭?em>xCo_2.1O₄ catalysts were more than 100 mV more negative than Pt/C in 1 M KOH. MEA with Cu_xMn_0.9鈭?em>xCo_2.1O₄ bifunctional oxygen electrode was prepared with CCM method and applied in a laboratory scale regenerative fuel cell. In fuel cell mode the peak power density was over 80 mW cm^鈭? and in electrolyser mode the onset voltage was about 1.55 V. The fuel cell to electrolyser voltage ration at 100 mA cm^鈭? achieved c.a. 31.87%.