Oxide Electrocatalysts Based on Earth-Abundant Metals for Both Hydrogen- and Oxygen-Evolution Reactions
Oxide Electrocatalysts Based on Earth-Abundant Metals for Both Hydrogen- and Oxygen-Evolution Reactions
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DOI：
10.1021/acssuschemeng.0c02498
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发表时间：
2020-08-10
影响因子：
8.4
通讯作者：
Ramezanipour, Farshid
中科院分区：
文献类型：
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作者：
Hona, Ram Krishna;Karki, Surendra B.;Ramezanipour, Farshid
报道了一种独特的双功能氧化物电催化剂，它能够催化分解水的两个半反应，即析氧反应(OER)和析氢反应(HER)，并具有在酸性和碱性介质中催化HER的能力，这是分解水催化剂中的罕见特性。除了具有双功能电催化性能外，CaSrFeMnO6-Delta还表现出OER活性，甚至优于已报道的贵金属电催化剂IrO2和RuO2的活性。证明了Ca2FeMnO6-Delta、CaSrFeMnO6-Delta和Sr2FeMnO6-Delta的电催化性能与电荷输运性质之间的相关性。考虑到电荷输运依赖于结构和缺陷，这项工作揭示了结构三角形、电荷输运和电催化分解水活性之间有趣的关联。
A unique bifunctional oxide electrocatalyst capable of catalyzing both half-reactions of water splitting, namely, oxygen-evolution reaction (OER) and hydrogen-evolution reaction (HER), with the added capability of catalyzing HER in both acidic and basic media, a rare property in water-splitting catalysts, is reported. In addition to the bifunctional electrocatalytic properties, CaSrFeMnO6-delta shows OER activity, which is even superior to the reported activities of precious-metal electrocatalysts, IrO2 and RuO2. The correlation of electrocatalysis with the charge-transport properties in the series Ca2FeMnO6-delta, CaSrFeMnO6-delta, and Sr2FeMnO6-delta is demonstrated. Given the dependence of charge transport on structure and defects, this work unravels the interesting correlations between the triangle of structure, charge transport, and electrocatalytic activity for water splitting.