Facile Synthesis of Porous Zinc Nanosheets for Highly Selective Electrochemical CO ₂ Reduction to CO

Abstract With the increasing levels of CO 2 emissions and the decreasing availability of energy resources, the electrocatalytic CO 2 reduction reaction (CO 2 RR) offers a promising method for utilizing CO 2 as a valuable resource using sustainable electrical energy. However, developing cost‐effective and highly efficient catalysts remains a significant challenge. Although zinc, an abundant element on Earth, has shown potential for converting CO 2 into CO, its effectiveness as a catalyst for CO 2 reduction is hindered by its low selectivity and stability. This study introduces a fast, efficient, and simple electrochemical deposition method for preparing porous zinc nanosheets (NS) using the hydrogen bubble template approach. The as‐prepared zinc NS catalyst demonstrates exceptional catalytic activity due to its highly porous structure and high specific surface area. At a voltage of −1 V versus RHE, it achieves a maximum CO Faradaic efficiency of 89.5 %. The performance of this system is characterized by a partial current density of around −6.17 mA cm −2 in an H‐cell configuration. Additionally, our catalyst exhibits remarkable durability over 10 h, highlighting its significant potential for real‐world utilization in CO 2 RR.