摘要
电催化裂解水产氢的能量消耗主要源于析氧反应(OER).开发高效、低成本的OER电催化剂加快电解水OER反应具有重要的科学和现实意义.钴基催化剂具有高活性、良好的电化学稳定性和较高的电子传导能力,能够有效促进OER反应的进行,逐渐成为化学和材料领域的研究热点.梳理总结目前关于钴基OER催化剂研究的前沿进展对于设计高效电解水催化剂具有重要的借鉴意义.本文归纳总结了目前报道的钴氧化物、钴氢氧化物、钴硫化物、钴磷化物、钴氮化物和钴硒化物6类钴基OER催化剂用于电解水领域的最新合成策略及其在不同酸碱环境中的适用性.从有望替代商业化IrO2和RuO2催化剂的角度出发,讨论了提高钴基OER催化剂外在活性和内在活性的不同方法,提出了钴基催化剂用于电解水研究的未来发展方向.
Abstract
The energy consumption for hydrogen production via electrocatalytic water splitting primarily originates from the oxygen evolution reaction(OER).Developing efficient and cost-effective OER electrocatalysts to accelerate the OER reaction in water electrolysis holds significant scientific and practical importance.Cobalt-based catalysts,known for their high intrinsic activity,good electrochemical stability,and high electron conductivity,have shown the capability to effectively promote the OER reaction,gradually emerging as a research hotspot in the field of chemistry and materials.Summarizing the current frontier advances in cobalt-based OER catalysts is of crucial reference value for researchers investigating electrocatalytic water splitting.This paper summarizes the latest synthesis strategies of six types of cobalt-based OER catalysts,including cobalt oxides,cobalt hydroxides,cobalt sulfides,cobalt phosphides,cobalt nitrides and cobalt selenides,reported so far for use in the field of water electrolysis,and their applicability in different acid-base environments.From a perspective more likely to replace commercial IrO2 and RuO2,a comprehensive discussion on different methods to enhance the external and internal activities of cobalt-based catalysts is provided,along with proposed future directions for the research of cobalt-based OER catalysts in water electrolysis.
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