Multi-scale study on bifunctional Co/Fe–N–C cathode catalyst layers with high active site density for the oxygen reduction reaction
Multi-scale study on bifunctional Co/Fe–N–C cathode catalyst layers with high active site density for the oxygen reduction reaction
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氧还原反应高活性位点密度双功能Co/Fe-N-C阴极催化剂层的多尺度研究
DOI：
10.1016/j.apcatb.2021.120656
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发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Guiver Michael D
中科院分区：
文献类型：
--
作者：
Zhu Weikang;Pei Yabiao;Douglin John C;Zhang Junfeng;Zhao Haoyang;Xue Ji;ang;Wang Qingfa;Li Ran;Qin Yanzhou;Yin Yan;Dekel Dario R;Guiver Michael D
近年来，人们致力于设计具有高孔隙率和高活性中心的催化剂。尽管基于旋转盘电极（RDE）测试使用Co/Fe-N-C催化剂实现了非常有希望的结果，但实际燃料电池性能低于预期，这可能是由于对催化剂层（CL）的理解不足。因此，催化剂的设计应该从整体上考虑CL性能，而不仅仅是固有活性。在此，通过仔细设计Co/Fe-ZIF前体，获得了在碳网络中具有高度分散的CoFe纳米合金的Co/Fe-N-C，导致具有良好稳定性的高氧还原反应（ORR）位点密度。针对动力学区RDE试验和影响因素复杂的单电池试验（SCT），引入半电池试验（HCT），以更准确地评价Co/Fe-CL的质量。在不同电流密度范围内进行多尺度测量（RDE、HCT和SCT），可以针对燃料电池性能的关键CL影响因素。
Recently, much work has been devoted to designing catalysts with high porosity and efficient active sites. Although very promising results are achieved using Co/Fe–N–C catalysts based on rotating disk electrode (RDE) tests, actual fuel cell performance is below expectations, probably due to insufficient understanding of the catalyst layer (CL). Therefore, catalyst design should be considered holistically by taking into account CL performance, not only intrinsic activity. Here, Co/Fe–N–C with highly dispersed CoFe nanoalloy in the carbon network is obtained by careful design of Co/Fe-ZIF precursor, resulting in a high oxygen reduction reaction (ORR) site density with good stability. Concerning RDE test in the kinetic region and single cell test (SCT) with complex influence factors, the half-cell test (HCT) is introduced to more accurately evaluate the quality of the Co/Fe–CL. Multi-scale measurements (RDE, HCT and SCT) in different current density ranges allows targeting the key CL influence factors for fuel cell performance.
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