Electrocatalytic Measurement Methodology of Oxide Catalysts Using a Thin-Film Rotating Disk Electrode
Electrocatalytic Measurement Methodology of Oxide Catalysts Using a Thin-Film Rotating Disk Electrode
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DOI：
10.1149/1.3456630
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发表时间：
2010-01-01
影响因子：
3.9
通讯作者：
Shao-Horn, Yang
中科院分区：
文献类型：
--
作者：
Suntivich, Jin;Gasteiger, Hubert A.;Shao-Horn, Yang
过渡金属氧化物可以对反应如碱性介质中的氧还原反应（ORR）表现出高的电催化活性。通常很难测量和比较氧化物催化剂在单位质量或单位表面积基础上的活性，这是因为到几十微米厚的多孔氧化物电极和在其内部的氧传输定义不佳。在这项研究中，开发了一种方法来比较亚微米级过渡金属氧化物的ORR活性。薄膜的LaNiO 3，LaCu0.5Mn0.5O3，和La0.75Ca0.25FeO3氧化物颗粒结合到玻璃碳通过离子交换的Nafion粘合剂，和他们的质量和特定的ORR活动提取旋转圆盘电极测量。发现LaNiO_3的比活度远高于La0.75Ca0.25FeO_3和LaCu0.5Mn0.5O_3。提出了LaNiO 3在实际燃料电池阴极中的投影，其被示出为与当前的铂基阴极竞争。(C)2010年电化学学会。[DOI：10.1149/1.3456630]保留所有权利。
Transition-metal oxides can exhibit high electrocatalytic activity for reactions such as the oxygen reduction reaction (ORR) in alkaline media. It is often difficult to measure and compare the activities of oxide catalysts on either per mass or per surface area basis, because of the poorly defined oxygen transport to and within porous oxide electrodes of several tens of micrometers thickness. In this study, a methodology was developed to compare the ORR activities of submicrometer-sized transition-metal oxides. Thin films of LaNiO3, LaCu0.5Mn0.5O3, and La0.75Ca0.25FeO3 oxide particles were bonded to glassy carbon via an ion-exchanged Nafion binder, and their mass and specific ORR activities were extracted from rotating disk electrode measurements. We found that the specific activity of LaNiO3 was much higher than that of La0.75Ca0.25FeO3 and LaCu0.5Mn0.5O3. The projection of LaNiO3 in the actual fuel cell cathode was presented, which was shown to be competitive with current platinum-based cathodes. (C) 2010 The Electrochemical Society. [DOI:10.1149/1.3456630] All rights reserved.