电解质
电化学
阳极
材料科学
插层(化学)
乙二醇
PEG比率
化学工程
分子
电化学窗口
质子输运
质子
无机化学
电极
纳米技术
化学
有机化学
物理化学
离子电导率
工程类
物理
量子力学
经济
财务
作者
Sicheng Wu,Junbo Chen,Zhen Su,Huijuan Guo,Tingwen Zhao,Chen Jia,Jennifer H. Stansby,Jiaqi Tang,Aditya Rawal,Fang Yu,Junming Ho,Chuan Zhao
出处
期刊:Small
[Wiley]
日期:2022-09-26
卷期号:18 (45)
被引量:17
标识
DOI:10.1002/smll.202202992
摘要
Proton electrochemistry is promising for developing post-lithium energy storage devices with high capacity and rate capability. However, some electrode materials are vulnerable because of the co-intercalation of free water molecules in traditional acid electrolytes, resulting in rapid capacity fading. Here, the authors report a molecular crowding electrolyte with the usage of poly(ethylene glycol) (PEG) as a crowding agent, achieving fast and stable electrochemical proton storage and expanded working potential window (3.2 V). Spectroscopic characterisations reveal the formation of hydrogen bonds between water and PEG molecules, which is beneficial for confining the activity of water molecules. Molecular dynamics simulations confirm a significant decrease of free water fraction in the molecular crowding electrolyte. Dynamic structural evolution of the MoO3 anode is studied by in-situ synchrotron X-ray diffraction (XRD), revealing a reversible multi-step naked proton (de)intercalation mechanism. Surficial adsorption of PEG molecules on MoO3 anode works in synergy to alleviate the destructive effect of concurrent water desolvation, thereby achieving enhanced cycling stability. This strategy offers possibilities of practical applications of proton electrochemistry thanks to the low-cost and eco-friendly nature of PEG additives.
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