Dual-Anion Regulation for Reversible and Energetic Aqueous Zn-CO2 Batteries

Herui Wang; Muhammad Kashif Aslam; Zhihao Nie; Kang Yang; Xinran Li; Sheng Chen; Qiang Li; Dongliang Chao; Jingjing Duan

doi:10.1002/smtd.202300867

Dual-Anion Regulation for Reversible and Energetic Aqueous Zn-CO₂ Batteries

Small Methods. 2023 Oct 30:e2300867. doi: 10.1002/smtd.202300867. Online ahead of print.

Authors

Herui Wang¹, Muhammad Kashif Aslam¹, Zhihao Nie¹, Kang Yang¹, Xinran Li², Sheng Chen¹, Qiang Li¹, Dongliang Chao², Jingjing Duan¹

Affiliations

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.

PMID: 37904326
DOI: 10.1002/smtd.202300867

Abstract

Aqueous 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.

Keywords: discharge voltage; electrochemical CO2 reduction reaction; energy efficiency; power density; reversible aqueous Zn-CO2 batteries.

Abstract

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