The electrochemical conversions of CO₂ to valuable products have gained much interest to mitigate the increasing CO₂ concentration in the atmosphere. Selective syntheses of differently shaped tin (Sn) catalysts of rod, rectangular sheet, and dendrite structures were reported here using a new solar electro-deposition method, and their catalytic performance was investigated for the electrochemical reduction of CO₂ to liquid fuel in an electrolyte solution of CO₂ dissolved pure water. The crystal orientation and structural properties of the prepared Sn catalysts were investigated by XRD and SEM analyses. The selective formation of HCOOH on the prepared Sn electrocatalyst was observed with high faradaic efficiency and HCOOH formation rate over the rod shaped Sn catalysts, resulted in a maximum faradaic efficiency of 94.5% at 1.6 V vs Ag/AgCl and a maximum formation rate of about 0.5 mol/g_cat h at 2 V vs Ag/AgCl. The present work may open up a new approach for a selective catalyst synthesis of known structural properties for effective CO₂ reduction reaction.

CO ₂电化学转化为有价值的产品引起了人们的广泛兴趣，以减轻大气中不断增加的CO ₂浓度。本文报道了使用新的太阳能电沉积方法选择性合成棒，矩形片和枝晶结构的不同形状的锡（Sn）催化剂，并研究了其催化性能，以将CO ₂电化学还原为电解液中的液体燃料CO ₂溶液溶解纯净水。通过XRD和SEM分析研究了制备的Sn催化剂的晶体取向和结构性能。观察到在制备的Sn电催化剂上HCOOH的选择性形成具有很高的法拉第效率，并且HCOOH的生成率超过了棒状Sn催化剂，在1.6 V vs Ag / AgCl时，最大的法拉第效率为94.5％，最大形成率约为5％。相对于Ag / AgCl，在2 V下为0.5 mol / g _cat h。当前的工作可以为用于有效CO ₂还原反应的已知结构性质的选择性催化剂合成开辟新方法。