Affiliation:
1. Green Catalysis Center College of Chemistry Zhengzhou University Zhengzhou Henan 450001 China
2. Henan Institute of Advanced Technology Zhengzhou University Zhengzhou Henan 450053 China
3. Beijing Synchrotron Radiation Facility (BSRF) Institute of High Energy Physics Chinese Academy of Sciences 19B yuquan rosd, Shijingshan district Beijing China
Abstract
AbstractTransforming carbon dioxide (CO2) into valuable chemical products or carbonaceous fuels is a crucial strategy for addressing the impact of global climate change and energy challenges. Electrochemical CO2 reduction reaction (eCO2RR) shows promise in this regard, but challenges remain in the eCO2RR, such as poor electrocatalytic activity and low selectivity of the target product. In this study, we report a one‐step method of replacement reaction for synthesizing a cadmium layer on the zinc foil surface (named as the Cd/Zn electrode) for efficient eCO2RR to CO. The thicknesses of Cd layers could be easily adjusted by varying the molar concentration of Cd2+. The Cd/Zn electrode with an approximately 2.0 μm thick Cd layer exhibited superior electrocatalytic performance of the eCO2RR to CO in the ionic liquid‐containing electrolytes. The highest Faradaic efficiency of CO reached up to 99.0 % at −1.9 V vs. Ag/Ag+, and the maximum CO partial current density achieved 34.8 mA cm−2 at −2.3 V vs. Ag/Ag+. The 3D fluffy Cd layer with a suitable thickness on the Zn foil surface provided abundant active sites, fast charge transfer rate, and strong adsorption ability of CO2⋅− intermediates, which contributed to the enhancement of the electrocatalytic performance of the eCO2RR to CO.
Funder
China Postdoctoral Science Foundation