Testing fuel cell catalysts under more realistic reaction conditions: accelerated stress tests in a gas diffusion electrode setup
Testing fuel cell catalysts under more realistic reaction conditions: accelerated stress tests in a gas diffusion electrode setup
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DOI：
10.1088/2515-7655/ab67e2
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发表时间：
2020-04-01
影响因子：
6.9
通讯作者：
Arenz, Matthias
中科院分区：
文献类型：
--
作者：
Alinejad, Shima;Inaba, Masanori;Arenz, Matthias
气体扩散电极（GDE）装置作为在更真实的反应条件下测试表面积质子交换膜燃料电池（PEMFC）催化剂的氧还原反应（ORR）活性的快速和直接的工具最近受到越来越多的关注。在这里介绍的工作中，我们证明，我们最近推出的GDE设置是适合的基准以及PEMFC催化剂的稳定性。基于所获得的结果，有人认为，GDE设置提供了固有的优势，加速降解试验（ADT）超过经典的三电极设置使用液体电解质。代替经典电化学电池中的固-液电解质界面，在GDE设置中形成（加湿的）反应物气体、质子交换聚合物（例如，Nafion）和电催化剂的现实三相边界。因此，GDE设置不仅允许精确的电位控制，而且允许对反应物气氛、湿度和温度的独立控制。此外，相同位置的透射电子显微镜（IL-TEM）技术可以很容易地被采用到设置中，使基准与机制研究相结合。
Gas diffusion electrode (GDE) setups have very recently received increasing attention as a fast and straightforward tool for testing the oxygen reduction reaction (ORR) activity of surface area proton exchange membrane fuel cell (PEMFC) catalysts under more realistic reaction conditions. In the work presented here, we demonstrate that our recently introduced GDE setup is suitable for benchmarking the stability of PEMFC catalysts as well. Based on the obtained results, it is argued that the GDE setup offers inherent advantages for accelerated degradation tests (ADT) over classical three-electrode setups using liquid electrolytes. Instead of the solid-liquid electrolyte interface in classical electrochemical cells, in the GDE setup a realistic three-phase boundary of (humidified) reactant gas, proton exchange polymer (e.g. Nafion) and the electrocatalyst is formed. Therefore, the GDE setup not only allows accurate potential control but also independent control over the reactant atmosphere, humidity and temperature. In addition, the identical location transmission electronmicroscopy (IL-TEM) technique can easily be adopted into the setup, enabling a combination of benchmarking with mechanistic studies.