关键词: 二氧化碳, 电化学, 还原, 金属基材料, 反应途径

Abstract: The electrocatalytic reduction of CO2 to valuable fuels and chemicals has great potential in mitigating global warming and effectively storing renewable energy, and has received extensive attention in recent years.Herein, first of all,this review briefly describes the research results of the reaction pathway of CO2 electrochemical reduction to different products in aqueous solution. Currently, the generation pathway of simple C1 products is relatively clear, but the reaction pathway for generating multi-carbon hydrocarbons and alcohols still lacks clear evidence and needs further exploration. Then, the recent advances of metal-based electrocatalytic materials for CO2 electrochemical reduction is described. Focusing on product selectivity, catalytic activity and stability, this review presents the research status of nanostructured metals, metal alloys, metal oxides, metal complexes, and singal atomic metal materials. Finally, the prospect of electrocatalytic CO2 reduction is proposed, and it is pointed out that continuously optimizing the performance of electrocatalytic materials is one of the main directions in future research, especially the single atomic catalysts which are expected to replace Au, Ag and other precious metals, as well as the copper-based materials that can efficiently produce multi-carbon products.At the same time, more accurate theoretical calculations combined with in-situ spectral characterizations, and the in-depth exploration of the mechanism of CO2 electrochemical reduction reactions will greatly promote the development of highly efficient electrocatalytic materials.

Key words: carbon dioxide, electrochemistry, reduction, metal-based material, reaction pathway