A Cobalt-Iron Double-Atom Catalyst for the Oxygen Evolution Reaction
A Cobalt-Iron Double-Atom Catalyst for the Oxygen Evolution Reaction
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DOI：
10.1021/jacs.9b05268
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发表时间：
2019-09-11
影响因子：
15
通讯作者：
Hu, Xile
中科院分区：
文献类型：
--
作者：
Bai, Lichen;Hsu, Chia-Shuo;Hu, Xile
单原子催化剂表现出明确的活性位点和潜在的最大原子效率。然而，它们不适合于受益于氧化促进的反应，例如在碱性介质中的析氧反应（OER）。在这里，我们表明，一个单原子的钴预催化剂可以在原位转化为Co-Fe双原子催化剂的OER。该催化剂在金属氧化物中表现出最高的转换频率之一。电化学，显微镜，和光谱数据，包括那些从操作X-射线吸收光谱，揭示了二聚钴-铁部分作为催化剂的活性位点。这项工作表明，双原子催化作为一种有前途的方法，用于开发定义和高活性的OER催化剂。
Single-atom catalysts exhibit well-defined active sites and potentially maximum atomic efficiency. However, they are unsuitable for reactions that benefit from bimetallic promotion such as the oxygen evolution reaction (OER) in an alkaline medium. Here we show that a single-atom Co precatalyst can be in situ transformed into a Co-Fe double-atom catalyst for the OER. This catalyst exhibits one of the highest turnover frequencies among metal oxides. Electrochemical, microscopic, and spectroscopic data, including those from operando X-ray absorption spectroscopy, reveal a dimeric Co-Fe moiety as the active site of the catalyst. This work demonstrates double-atom catalysis as a promising approach for the development of defined and highly active OER catalysts.