Theoretical Basis, Research Status and Development Trends of Transition Metal Based Self-supporting Materials for Electrocatalytic Oxygen Evolution Reaction in Alkaline Water Electrolysis
PENG Weiliang, YUAN Bin*
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
Abstract: It is an inevitable choice for human beings to achieve sustainable development by developing clean renewable energy, such as solar energy, wind energy and so on. Oxygen evolution reaction (OER) plays an indispensable role among various advanced new energy technologies, especially in the field of alkaline water electrolysis. However, OER is a four electron-proton coupled reaction. The sluggish kinetics are considered to be a hindrance to efficient water splitting. Therefore, highly efficient catalysts are required to lower the OER overpotential to enhance the energy conversion efficiency. Over the past decade, great progresses have been made in the mechanism of OER and efficient catalysts. Noble metal-based catalysts, such as IrO2 and RuO2, show high OER activity. Nevertheless, they suffer from high prices and limited reserves on the earth, limiting their widespread industrial applications. Therefore, it is highly attractive to develop alternative OER catalysts based on transition metals because of their relative abundance, low cost and considerable catalytic activity. Currently, most of the transition metal based OER catalysts are powders, which must be coated onto conductive substrates with the aid of binders. And the utilization of binders will adversely affect the exposure of active sites, conducti-vity, and stability of the catalysts. Therefore, it is important to develop a highly efficient, stable and economical transition metal-based self-supporting OER catalyst. However, the common transition metal-based self-supporting OER catalysts have poor intrinsic catalytic activity, low specific surface area which provides few catalytic active sites, resulting in low overall catalytic activity. Besides, the poor chemical stability of them causes corrosion easily and further decreases catalytic activity under high concentration alkaline electrolyte and polarization potential. In order to solve these problems, researchers have proposed some strategies to improve the activity of transition metal-based self-supporting OER catalysts, including preparing porous or nano-scale catalysts, strengthening synergic effects and electronic effects, synthesizing heterostructures by coupling interface constructions and electronic engineering. Furthermore, the corresponding preparation methods, like hydrothermal method, electrodeposition method, chemical vapor deposition, and room temperature chemical bath also have been proposed. Meanwhile, researchers have offered some evaluation methods for transition metal-based self-supporting OER catalysts, such as overpotential and Tafel slope, and hoped to establish an objective and fair evaluation standard. Herein, we summarize the research progresses of transition metal-based self-supporting OER catalysts in recent years, specially introduced the mechanism of OER and the types of transition metal catalysts, and emphatically clarified the strategies for improving the activity of transition metal-based self-supporting OER catalysts and their preparation methods. Finally, we also discussed the evaluation criteria, the existing problems and the future research directions of transition metal-based self-supporting OER catalysts.
彭伟良, 袁斌. 自支撑过渡族金属基电催化析氧材料在碱水电解中的理论基础、研究现状及发展趋势[J]. 材料导报, 2021, 35(9): 9174-9185.
PENG Weiliang, YUAN Bin. Theoretical Basis, Research Status and Development Trends of Transition Metal Based Self-supporting Materials for Electrocatalytic Oxygen Evolution Reaction in Alkaline Water Electrolysis. Materials Reports, 2021, 35(9): 9174-9185.
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