插层(化学)
析氧
氧气
过渡金属
八面体
化学工程
分子
离子交换
催化作用
无机化学
金属
化学
材料科学
电化学
过电位
离子
有机化学
物理化学
工程类
冶金
电极
作者
Yue Yang,Xingsong Su,Lei Zhang,Peter Kerns,Laura A. Achola,Veronica Hayes,Rebecca C. Quardokus,Steven L. Suib,Jie He
出处
期刊:Chemcatchem
[Wiley]
日期:2019-02-27
卷期号:11 (6): 1689-1700
被引量:50
标识
DOI:10.1002/cctc.201802019
摘要
Abstract The catalytic activity of MnO 2 nanosheets towards oxygen evolution depends highly on their interlayer environment. We present a systematic investigation on fine‐tuning of the interlayer environment of MnO 2 nanosheets by intercalation through a facile cation exchange with inexpensive first‐row transition metal cations, including Ni 2+ , Co 2+ , Cu 2+ , Zn 2+ , and Fe 3+ ions. Among them, the Ni‐intercalated MnO 2 nanosheets show remarkably enhanced OER activity and long‐term stability, compared to pristine MnO 2 nanosheets. The overpotential of 330 mV at a current density of 10 mA cm −2 is observed for the Ni‐intercalated MnO 2 nanosheets. The ehancement mechanism of OER is studied by comparing physiochemical properties, such as the oxidation state of Mn, the interlayer distance, the increase in the disorder/twisting of MnO 6 octahedra, and the interlayer cooperative binding of water molecules. The Ni intercalation, different from other metal cations, strengthens the Mn−O bond perpendicularly to the layer chains to facilitate the interlayer catalysis possibly between two Mn sites, and thus promotes the efficiency of oxygen evolution.
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