【目的】电催化CO2还原反应(CO2RR)为高价值的化学品目前广受关注。为了提高电催化活性和选择性,制备具有优异CO2RR性能的催化剂十分必要。【方法】选用麦麸为原料制成生物质炭(C),进一步采用简单的水热法制备生物质炭耦合铜氧化物复合电催化剂,并对其进行物化表征和电化学性能测试。【结果】结果显示,在-1.08V(vs.RHE)的电压下,样品CuO/Cu4O3@C-2在饱和CO2的0.5mol/LKHCO3溶液中,C2H4的法拉第效率最大(46.32%)。另外在-1.08V(vs.RHE)时进行了11.5h的CO2RR稳定性测试,该样品同样展现了优异的稳定性。【结论】研究结果为合成CO2RR成本低廉、高电化学性能的催化剂提供了一种可行的策略。

【Purposes】 Electrochemical CO  reduction reaction (CO RR) to high-value chemicals  is currently receiving widespread attention. In order to improve the electrocatalytic activity and selec‐ tivity, it is necessary to prepare catalysts with superior CO RR properties. 【Methods】 In this study,  wheat bran-based biochar (C) was prepared and coupled with copper oxide to get composite electro‐ catalysts through a simple hydrothermal method, and physicochemical characterizations and electro‐ chemical performance testings were further condueted. 【Findings】 The results suggest that the CuO/ Cu O @C-2 shows the best Faradaic efficiency of C H  (46.32%) at -1.08 V (vs. RHE). Meanwhile,  the sample displays excellent stability for 11.5 h at -1.08 V (vs. RHE). 【Conclusions】 This study pro‐ vides a feasible strategy for the synthesis of cost-effective catalysts with high electrochemical perfor‐ mance.