An acetate electrolyte for enhanced pseudocapacitve capacity in aqueous ammonium ion batteries

Zhuoheng Bao, Chengjie Lu, Qiang Liu, Fei Ye, Weihuan Li, Yang Zhou, Long Pan, Lunbo Duan, Hongjian Tang, Yuping Wu, Linfeng Hu () and ZhengMing Sun ()
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Zhuoheng Bao: Southeast University
Chengjie Lu: Southeast University
Qiang Liu: Southeast University
Fei Ye: Southeast University
Weihuan Li: Southeast University
Yang Zhou: Southeast University
Long Pan: Southeast University
Lunbo Duan: Southeast University
Hongjian Tang: Southeast University
Yuping Wu: Southeast University
Linfeng Hu: Southeast University
ZhengMing Sun: Southeast University

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

Abstract: Abstract Ammonium ion batteries are promising for energy storage with the merits of low cost, inherent security, environmental friendliness, and excellent electrochemical properties. Unfortunately, the lack of anode materials restricts their development. Herein, we utilized density functional theory calculations to explore the V2CTx MXene as a promising anode with a low working potential. V2CTx MXene demonstrates pseudocapacitive behavior for ammonium ion storage, delivering a high specific capacity of 115.9 mAh g−1 at 1 A g−1 and excellent capacity retention of 100% after 5000 cycles at 5 A g−1. In-situ electrochemical quartz crystal microbalance measurement verifies a two-step electrochemical process of this unique pseudocapacitive storage behavior in the ammonium acetate electrolyte. Theoretical simulation reveals reversible electron transfer reactions with [NH4+(HAc)3]···O coordination bonds, resulting in a superior ammonium ion storage capacity. The generality of this acetate ion enhancement effect is also confirmed in the MoS2-based ammonium-ion battery system. These findings open a new door to realizing high capacity on ammonium ion storage through acetate ion enhancement, breaking the capacity limitations of both Faradaic and non-Faradaic energy storage.

Date: 2024
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DOI: 10.1038/s41467-024-46317-5

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