Affiliation:
1. School of Applied Chemistry and Engineering University of Science and Technology of China Hefei 230026 P.R. China
2. State Key Laboratory of Electroanalytical Chemistry & Jilin Province Key Laboratory of Low Carbon Chemical Power Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Renmin Street Changchun 130022 P.R. China
3. Mössbauer Effect Data Center & Laboratory of Catalysts and New Materials for Aerospace Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P.R. China
Abstract
AbstractAs well‐known electrocatalysts with good catalytic efficiency for carbon dioxide reduction reaction (CO2RR) towards the production of formate, tin (Sn)‐based catalysts have aroused broad concern. Here, free‐standing porous stanene is synthesized for the first time by a facile wet chemical method, and its excellent electrocatalytic performance for formate (HCOO−) formation in CO2RR is demonstrated. High Faradaic efficiency (F.E., 93% at −930 mV versus reversible hydrogen electrode (RHE)) can be achieved in the CO2RR catalyzed by stanene in 0.5 m KHCO3 aqueous solution. The in situ Mössbauer spectra reveal that zero‐valent Sn aids in improving the selectivity of formate production. Furthermore, density functional theory calculations suggest that the high selectivity of HCOO− of CO2RR on stanene mainly originates from the edge sites on Sn (100). To further explore the practicability of the stanene‐based catalysts for CO2RR, stanene decorated by 3 wt% BP‐2000 is prepared, showing an excellent F.E. of 98% at −930 mV versus RHE due to the higher exposure of catalytic active sites. These new findings of the activity origination and reaction mechanism of stanene contribute to the deeper understanding of Sn‐based catalysts for CO2RR, which is beneficial for the future designation of highly efficient CO2RR catalysts.
Funder
National Natural Science Foundation of China
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment