【目的】电催化技术将CO2转化为高附加值燃料和化学品具有广阔的应用前景。然而,开发具有性能优异的电催化剂仍具有巨大的挑战性。【方法】采用麦麸皮为生物质炭前驱体,利用热解法制备氮掺杂生物质炭材料(NC),进一步通过水热法与CuO进行耦合,构筑了一系列的CuO@NC复合材料。采用多种表征手段,对其晶相、微观形貌和结构及元素价态进行分析,并通过电催化还原CO2反应来探讨其电催化性能。【结果】结果表明,在160℃合成温度下获得的复合催化剂(CuO@NC-160)对乙烯有较高的选择性,在-1.18V(vs.RHE)时,法拉第效率为26.85%。研究为制备廉价、高效的CuO基电催化剂提供了一种可行路径。

【Purposes】Electrocatalytic technology for converting CO  into high-value-added fuels  and chemicals has promising applications. However, developing electrocatalysts with superior perfor‐ mance still faces significant challenges. 【Methods】In this study, wheat bran was used as the precursor  of biomass carbon and the pyrolysis method was used to prepare nitrogen-doped biomass carbon mate‐ rials (NC). By further coupling with CuO via a hydrothermal method, a series of CuO@NC composite  materials were costructed. The crystalline phase, microscopic morphology, structure, and elemental  valence states were analyzed by multiple characterization techniques. The electrocatalytic performance  was investigated towards the electrocatalytic reduction of CO . 【Findings】 Results indicate that the  composite catalyst synthesized at 160 ℃ (CuO@NC-160) exhibits high selectivity towards ethylene,  with a maximum faradaic efficiency of 26.85% at -1.18 V vs. RHE. This study presents a feasible  pathway for fabricating low-cost and efficient CuO-based electrocatalysts.