Catalyst or Precatalyst? The Effect of Oxidation on Transition Metal Carbide, Pnictide, and Chalcogenide Oxygen Evolution Catalysts
Catalyst or Precatalyst? The Effect of Oxidation on Transition Metal Carbide, Pnictide, and Chalcogenide Oxygen Evolution Catalysts
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DOI：
10.1021/acsenergylett.8b01774
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发表时间：
2018-11
影响因子：
22
通讯作者：
Bryan R. Wygant;Kenta Kawashima;C. Mullins
中科院分区：
文献类型：
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作者：
Bryan R. Wygant;Kenta Kawashima;C. Mullins
金属硫族化物、磷族化物和碳化物，统称为金属X-IDE，已成为一类令人兴奋的新型水氧化电催化剂，但对于“真正”催化剂的组成缺乏共识。最突出的理论是，X-ides要么完全氧化，要么不氧化，要么在测试后转化为核@壳颗粒。在这里，我们研究了每个猜想的例子，总结了关于催化剂身份的相互矛盾的观点，并为未来更严格的识别提供了指导。大多数研究表明，催化剂表面的至少部分氧化对于高性能至关重要，这可能是由于氧化时催化剂表面积增加或 X-ide 核中电荷转移改善所致。因此，更彻底和统一的长期测试和纳米级化学分析对于确定这些因素与催化剂性能的关系至关重要。
Metal chalcogenides, pnictides, and carbides, labeled collectively as metal X-ides, have become an exciting new class of water oxidation electrocatalysts, but there is a lack of agreement regarding the composition of the “true” catalyst. The most prominent theories are that the X-ides are either completely oxidized, left unoxidized, or transformed into core@shell particles upon testing. Here, we examine examples of each conjecture, summarizing the conflicting viewpoints on catalyst identity and offering guidelines for more rigorous identification in the future. Most studies indicate that at least partial oxidation of the catalyst surface is critical to high performance, likely caused by an increased catalyst surface area upon oxidation or improved charge transfer in the X-ide cores. Therefore, more thorough and uniform long-term testing and nanoscale chemical analysis are essential to determine how these factors relate to catalyst performance.