Electrocatalytic CO₂ reduction to produce low-carbon chemicals/fuels is one of the important approaches in CO₂ emission reduction and utilization. However, the insufficient catalytic activity, stability and selectivity of the electrocatalysts have been identified to be the major challenges. In this work, the novel Bi-MWCNT-COOH/Cu catalysts are prepared via a facile co-electrodeposition technique on copper foil to form the catalyst electrodes for selectively electro-catalyzing CO₂ reduction to produce formic acid (HCOOH). Such catalyst electrodes show rather high catalytic activity, stability and selectivity toward the production of HCOOH. The faradaic efficiency for HCOOH production can reach up to 91.7 % at −0.76 V vs. RHE, and no obvious decrease can be observed after 12 h of continuous electrolysis. Such an electrodeposition technique to produce composite catalyst electrodes with operation simplicity, rapidity, and cost-effectiveness, exhibits a good prospect for scaled-up industrial applications.

电催化还原CO ₂以生产低碳化学品/燃料是减少和利用CO ₂的重要方法之一。然而，已经发现电催化剂的不足的催化活性，稳定性和选择性是主要的挑战。在这项工作中，新型的Bi-MWCNT-COOH / Cu催化剂是通过在铜箔上的便捷共电沉积技术制备的，以形成用于选择性电催化CO ₂的催化剂电极。还原生成甲酸（HCOOH）。这种催化剂电极对HCOOH的生产显示出相当高的催化活性，稳定性和选择性。HCOOH生产的法拉第效率在-0.76 V时相对于RHE可以达到91.7％，并且在连续电解12 h后没有观察到明显的降低。这种生产操作简单，快速且具有成本效益的复合催化剂电极的电沉积技术为大规模工业应用展示了良好的前景。