Affiliation:
1. School of Metallurgy and Environment Central South University Changsha Hunan 410083 China
2. Shanghai Electro‐Mechanical Engineering Institute Shanghai 201109 China
3. College of Energy and Power Engineering Changsha University of Science & Technology Changsha 410114 China
Abstract
AbstractThe high activity of water molecules induces notorious side reactions that seriously impair the stability of the Zn metal anode. Inspired by the mechanism of proton transfer in an aqueous solution, ectoine (ET) with a kosmotropic effect is first introduced into the typical aqueous electrolyte of aqueous zinc‐ion batteries (ZIBs). The hydrogen bond enhancement brought by the ET additive increases the energy barrier for the reconfiguration of hydrogen bonds, thereby impeding the hopping transport of protons based on the Grotthuss mechanism. The inhibited hydrogen evolution reaction (HER) by impeded proton transfer is strongly proved by in situ electrochemical gas chromatography (EC‐GC). The distinctive hydrogen bond enhancement effect of ET results in remarkably improved Zn anode stability while maintaining fast reaction kinetics. Consequently, the Zn//Zn symmetric cell delivers an ultra‐long cycle life of 5700 h 1 mA cm−2/1 mAh cm−2 and 2000 h at 5 mA cm−2/5 mAh cm−2 with lower voltage hysteresis, extending a cycling life by >27 and 24 times without sacrificing reaction kinetics.
Funder
Natural Science Foundation of Hunan Province
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment
Cited by
1 articles.
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