Integrated energy storage and CO2 conversion using an aqueous battery with tamed asymmetric reactions

Yumei Liu, Yun An, Jiexin Zhu, Lujun Zhu, Xiaomei Li, Peng Gao, Guanjie He and Quanquan Pang ()
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Yumei Liu: Peking University
Yun An: Peking University
Jiexin Zhu: Peking University
Lujun Zhu: Peking University
Xiaomei Li: Peking University
Peng Gao: Peking University
Guanjie He: University College London
Quanquan Pang: Peking University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Developing a CO2-utilization and energy-storage integrated system possesses great advantages for carbon- and energy-intensive industries. Efforts have been made to developing the Zn-CO2 batteries, but access to long cycling life and low charging voltage remains a grand challenge. Here we unambiguously show such inefficiencies originate from the high-barrier oxygen evolution reaction on charge, and by recharging the battery via oxidation of reducing molecules, Faradaic efficiency-enhanced CO2 reduction and low-overpotential battery regeneration can be simultaneously achieved. Showcased by using hydrazine oxidation, our battery demonstrates a long life over 1000 hours with a charging voltage as low as 1.2 V. The low charging voltage and formation of gaseous product upon hydrazine oxidation are the key to stabilize the catalyst over cycling. Our findings suggest that by fundamentally taming the asymmetric reactions, aqueous batteries are viable tools to achieve integrated energy storage and CO2 conversion that is economical, highly energy efficient, and scalable.

Date: 2024
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DOI: 10.1038/s41467-023-44283-y

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