Mechanism of biochar-Cu-based catalysts construction and its electrochemical CO2 reduction performance

作者：Linhan Dong, Dongdong Feng, Yuxin Zhang, Zhaolin Wang, Yijun Zhao, Qian Du, Jianmin Gao, Shaozeng Sun · 发表于：Carbon Capture Science & Technology · 年份：2024 · DOI：10.1016/j.ccst.2024.100250 · 被引用次数：12 · 研究领域：CO2 Reduction Techniques and Catalysts、Electrocatalysts for Energy Conversion、Ammonia Synthesis and Nitrogen Reduction

• Biochar has a well-developed pore structure that provides a site for CO 2 reduction. • Biochar pore size and high specific surface area provide active sites for ECO 2 RR. • Urea increases the loading of biochar loaded with Cu. • The smaller the particle size of biochar-loaded Cu, the greater the reactivity. Electrochemical CO 2 reduction can convert CO 2 into high-value-added products for special forms of energy storage and efficient carbon utilization for renewable electricity. To investigate the influence of biochar-Cu-based catalysts properties on electrochemical CO 2 reduction performance, Cu is loaded onto rice husk-based biochar by impregnation method combined with pyrolysis and calcination in this study. The three synthesized biochar-Cu-based catalysts are tested for activity and electrochemical CO 2 reduction performance in Flow Cell. The results show that biochar's properties, such as its high specific surface area, rich pore structure, and adjustable pore structure, provide sufficient sites for CO 2 reduction. Urea can relatively increase the copper loading by 44 %, but it will also increase the clustering of copper. In the reduction performance test, the current density of char-Cu-700 is 2.08 times higher than that of char-Cu and 1.45 times higher than char-Cu-N at a reduction potential of -0.45 (V vs. RHE). The current density enhancement of the catalyst loaded on biochar with Cu particle size of 10 nm is about 50 % higher than that of the catalyst with a partic...