Advances in cobalt-based catalysts for electrocatalytic water oxidation
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.
water electrolysisoxygen evolution reaction(OER)cobalt-based catalystelectrocatalysis
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