Affiliation:
1. School of Energy and Power Engineering MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 P. R. China
2. Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials College of Chemistry and Materials Fudan University Shanghai 200433 P. R. China
Abstract
AbstractAqueous Zn–CO2 batteries can not only convert CO2 into high‐value chemicals but also store/output electric energy for external use. However, their performance is limited by sluggish and complicated CO2 electroreduction at the cathode. Herein, a dual‐anion regulated Bi electrocatalyst is developed to selectively reduce CO2 to formate with a Faradaic efficiency of up to 97% at a large current density of 250 mA cm−2. With O and/or F, the rate‐determine step of CO2 electroreduction has been manipulated (from the first hydrogenation to *HCOOH desorption step) with a reduced energy barrier. Significantly, the fabricated Zn–CO2 battery exhibits a high discharge voltage of 1.2 V, optimal power density of 4.51 mW cm−2, remarkable energy density of 802 Wh kg−1, and energy‐conversion efficiency of 70.74%, stability up to 200 cycles and 68 h. This study provides possible strategies to fabricate reversible and energetic aqueous Zn–CO2 batteries by addressing cathodic problems.
Funder
National Natural Science Foundation of China
National Basic Research Program of China
Natural Science Foundation of Jiangsu Province
Fundamental Research Funds for the Central Universities
Subject
General Materials Science,General Chemistry
Cited by
3 articles.
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