摘要：Cu-based catalysts are the most promising candidates for electrochemical CO_(2)reduction(CO_(2)RR)to multi-carbon(C_(2))*** the C-C coupling process,the rate-determining step for C_(2)product generation,is an important strategy to improve the production and selectivity of the C_(2)*** this study,we determined that the local electric field can promote the C-C coupling reaction and enhance CO_(2)electroreduction to C_(2)***,finite-element simulations indicated that the high curvature of the Cu nanoneedles results in a large local electric field on their *** functional theory(DFT)calculations proved that a large electric field can promote C-C *** by this prediction,we prepared a series of Cu catalysts with different *** Cu nanoneedles(NNs)exhibited the largest number of curvatures,followed by the Cu nanorods(NRs),and Cu nanoparticles(NPs).The Cu NNs contained the highest concentration of adsorbed K+,which resulted in the highest local electric field on the *** adsorption sensor tests indicated that the Cu NNs exhibited the strongest CO adsorption ability,and in-situ Fourier-transform infrared spectroscopy(FTIR)showed the strongest*COCO and*CO signals for the Cu *** experimental results demonstrate that high-curvature nanoneedles can induce a large local electric field,thus promoting C-C *** a result,the Cu NNs show a maximum FEC_(2)of 44%for CO_(2)RR at a low potential(-0.6 V ***),which is approximately 2.2 times that of the Cu *** work provides an effective strategy for enhancing the production of multi-carbon products during CO_(2)RR.