Dual‐Anion Regulation for Reversible and Energetic Aqueous Zn–CO2 Batteries

Author:

Wang Herui1,Aslam Muhammad Kashif1,Nie Zhihao1,Yang Kang1,Li Xinran2,Chen Sheng1,Li Qiang1,Chao Dongliang2ORCID,Duan Jingjing1

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

Publisher

Wiley

Subject

General Materials Science,General Chemistry

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