Evaluating Electrocatalysts at Relevant Currents in a Half-Cell: The Impact of Pt Loading on Oxygen Reduction Reaction
Evaluating Electrocatalysts at Relevant Currents in a Half-Cell: The Impact of Pt Loading on Oxygen Reduction Reaction
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DOI：
10.1149/2.0911915jes
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发表时间：
2019-11-21
影响因子：
3.9
通讯作者：
Cherevko, Serhiy
中科院分区：
文献类型：
--
作者：
Ehelebe, Konrad;Seeberger, Dominik;Cherevko, Serhiy
在这项工作中，气体扩散电极（GDE）半电池实验被提出作为燃料电池催化剂层评估中的有力工具，因为它可以将基本方法的优点（如薄膜旋转盘电极（TF-RDE））（如结果的良好可比性、专用于消除不期望的参数等）转移到燃料电池应用的相关电位范围而没有质量传输限制。随着开发的设置和电化学协议，不同的Pt/C负载的第一个实验证实了良好的再现性。因此，在0.6 V vs. RHE下实现了高达30 A mg（Pt）（-1）的质量比电流密度。从方法学的角度来看，良好的可比性，单细胞测量后获得的温度和浓度效应的理论校正。与先前使用GDE半电池的研究相比，在宽的电势窗口中记录了没有严重传质限制的极化曲线。所有这些成果表明，所提出的方法可以是一个有效的工具，桥梁之间的差距差距TF-RDE和单电池实验提供快速和专门的见解，催化剂层对氧还原反应性能的影响。这种方法将能够直接和有效地优化催化剂层的组成和结构，特别是对于新型催化剂，从而有助于提高燃料电池的性能与减少Pt负载。(c)作者（S）2019由ECS发布。这是一篇开放获取的文章，根据知识共享署名4.0许可证（CC BY，http：//creativecommons.org/licenses/by/4.0/）的条款分发，该许可证允许在任何媒体上不受限制地重复使用作品，前提是正确引用原始作品。[DOI：10.1149/2.0911915jes]
In this work gas diffusion electrode (GDE) half-cells experiments are proposed as powerful tool in fuel cell catalyst layer evaluation as it is possible to transfer the advantages of fundamental methods like thin-film rotating disk electrode (TF-RDE) such as good comparability of results, dedicated elimination of undesired parameters etc. to relevant potential ranges for fuel cell applications without mass transport limitations. With the developed setup and electrochemical protocol, first experiments on different Pt/C loadings confirm excellent reproducibility. Thereby mass-specific current densities up to 30 A mg(Pt)(-1) at 0.6 V vs. RHE are achieved. From a methodological perspective, good comparability to single cell measurements is obtained after theoretical corrections for temperature and concentration effects. In comparison to previous studies with GDE half-cells, polarization curves without severe mass transport limitations are recorded in a broad potential window. All these achievements indicate that the proposed method can be an efficient tool to bridge the gap between TF-RDE and single cell experiments by providing fast and dedicated insights into the effects of catalyst layers on oxygen reduction reaction performance. This method will enable straightforward and efficient optimization of catalyst layer composition and structure, especially for novel catalysts, thereby contributing to the performance enhancements of fuel cells with reduced Pt loading. (c) The Author(s) 2019. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.0911915jes]