Enhancement of the electroreduction of oxygen on Pt alloys with Fe, Ni, and Co
Enhancement of the electroreduction of oxygen on Pt alloys with Fe, Ni, and Co
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DOI：
10.1149/1.1392544
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发表时间：
1999-10-01
影响因子：
3.9
通讯作者：
Watanabe, M
中科院分区：
文献类型：
--
作者：
Toda, T;Igarashi, H;Watanabe, M
研究了Pr合金与Ni、Co、Fe在高氯酸溶液中的氧还原反应的电催化活性。用旋转电极的流体动力学伏安法测定了其电催化活性。在Ni、Co和Fe含量分别为30%、40%和50%左右时，活性最高，此时的动能电流密度分别是纯铂的10、15和20倍。对反应后表面的X射线光电子能谱分析表明，活性表面被少量的铂单层覆盖。我们提出了一种增强ORR的机制，这种机制是基于底层合金引起的薄铂表面层d电子空位的增加。这项工作在开发新型活性阴极催化剂、燃料电池作为电动汽车的动力源等方面做出了贡献。(C)1999电化学学会。S0013-4651(98)12-072-4。版权所有。
Electrocatalytic activity of Pr alloys with Ni, Co, and Fe, formed by sputtering, was investigated with regard to the oxygen reduction reaction (ORR) in perchloric acid solution. Hydrodynamic voltammograms with rotated electrodes were used to measure the electrocatalytic activity. Maximum activity was observed at ca. 30, 40, and 50% content of Ni, Co, and Fe, respectively, by which 10, 15, and 20 times larger kinetic current densities than that of purr Pt were attained, X-ray photoelectron spectroscopy analysis of the surfaces after the reaction indicated that the active surfaces were covered by a few monolayers of Pt. We present an enhancing mechanism for the ORR based on an increased d-electron vacancy of the thin Pt surface layer caused by underlying alloy. Result!, of this work contribute in development of new active cathode catalysts fur fuel cells used as power sources of electric vehicles, etc. (C) 1999 The Electrochemical Society. S0013-4651(98)12-072-4. All rights reserved.