Strengthen metal-oxygen covalency of CoFe-layered double hydroxide for efficient mild oxygen evolution
Strengthen metal-oxygen covalency of CoFe-layered double hydroxide for efficient mild oxygen evolution
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增强CoFe层状双氢氧化物的金属-氧共价，以实现高效的温和析氧
DOI：
10.1007/s12274-021-3451-7
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发表时间：
2021-04
期刊：
影响因子：
9.9
通讯作者：
Li Jinping
中科院分区：
文献类型：
--
作者：
Zhong Dazhong;Li Tan;Wang Dong;Li Lina;Wang Jiancheng;Hao Genyan;Liu Guang;Zhao Qiang;Li Jinping
析氧反应（OER）是制氢和其他储能技术的关键。CoFe-层状双氢氧化物（CoFe-OH）被广泛认为是碱性水溶液中最有效的OER电催化剂之一。然而，它在中性电解质中的活性仍然很低。本文描述了部分氧化的CoFe-OH（PO-CoFe-OH），其M-O键的共价性增强，并且在温和条件下显示出增强的OER性能。机理研究表明，适当提高PO-CoFe-OH的M-O共价性，可使OER机理转变为晶格氧氧化机理，并促进限速去质子化，从而提供上级OER性能。在0.1 M KHCO 3水溶液（pH = 8.3）中，分别需要186和365 mV的过电位来驱动1和10 mA·cm-2的电流密度。这为温和条件下水氧化催化剂的合理设计提供了新的途径。
Oxygen evolution reaction (OER) is crucial for hydrogen production as well as other energy storage technologies. CoFe-layered double hydroxide (CoFe-OH) has been widely considered as one of the most efficient electrocatalysts for OER in basic aqueous solution. However, it still suffers from low activity in neutral electrolyte. This paper describes partially oxidized CoFe-OH (PO-CoFe-OH) with enhanced covalency of M-O bonds and displays enhanced OER performance under mild condition. Mechanism studies reveal the suitably enhanced M-O covalency in PO-CoFe-OH shifts the OER mechanism to lattice oxygen oxidation mechanism and also promotes the rate-limiting deprotonation, providing superior OER performance. It just requires the overpotentials of 186 and 365 mV to drive the current density densities of 1 and 10 mA·cm−2in 0.1 M KHCO3aqueous solution (pH = 8.3), respectively. It provides a new process for rational design of efficient catalysts for water oxidation in mild conditions.
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