MOFs derived N doped CuNi_x@C dual metallic core-shell electrocatalysts for CO₂ electrocatalytic reduction

Electroreduction CO2 to produce high-value-added multi-carbon products is an ideal way to mitigate the greenhouse effect. However, designing efficient, inexpensive electrocatalysts is a technical bottleneck. In this work, a series of CuNix @N-C core-shell catalysts were prepared by high-temperature carbonization method using MOF as a precursor. The selectivity of the multi-carbon products was optimized by adjusting the Cu and Ni metal ratio in the precursor. Besides, the outer layer of graphite promoted the adsorption capacity of CO2 and prevented the agglomeration of metal particles. As a result, CuNi2 @N-C exhibited superior electrocatalytic performance at - 0.97 V vs. RHE. The Faradaic efficiencies of ethanol and acetone were 27.38% and 25.96%, respectively. Moreover, the CuNi2 @N-C could operate stably for 10 h even at 200 mA center dot cm(-2). This work provides an effective strategy for designing high performance Cu-based electrocatalysts.