电解质
胶体
电解
材料科学
氧化还原
化学工程
储能
电池(电)
电化学
纳米片
水溶液
无机化学
电极
纳米技术
化学
冶金
有机化学
量子力学
物理
工程类
物理化学
功率(物理)
作者
Haocheng Guo,Li-Yang Wan,Jiaqi Tang,Si-Cheng Wu,Zhen Su,Neeraj Sharma,Yu Fang,Zhaoping Liu,Chuan Zhao
出处
期刊:Nano Energy
[Elsevier]
日期:2022-11-01
卷期号:102: 107642-107642
被引量:2
标识
DOI:10.1016/j.nanoen.2022.107642
摘要
The emerging proton electrochemistry offers opportunities for future energy storage of high capacity and rate. However, the development of proton batteries is hindered by low working-potentials of electrodes and poor cycle life of full-cells (e.g., tens-of-hours). The high-potential MnO2/Mn2+ redox couple presents a facile and competitive cathode choice, typically via electrodepositing solids on substrates for energy storage. Herein, we show the formation of homogeneous and stable MnO2 colloids from the Mn2+ electrolysis in H2SO4 (≥ 1.0 M), and their application to achieve long life proton batteries. Colloid electrolytes enable prolonged cycling of a MnO2//MoO3 cell from 11.7 h to 33 days, and a MnO2//pyrene-4,5,9,10-tetraone cell for 489days, which is the longest duration ever reported for proton batteries. Comprehensive analysis shows the colloid particle is mainly a MnO2 nucleus coordinated by electrolyte ions of hydrated Mn2+, Mn3+, H+ and SO42-. Through water dilution, solid components of colloids precipitate into hierarchical nanosheet spheres; Further characterizations of the precipitates and deposited substrates reveal ε-MnO2 as the major electrolytic product regardless of electrolytes used. Different colloids could reform from precipitates depending on presence/absence of Mn2+ in acids, suggesting colloid balances include both physical and chemical interactions. Our findings of the new chemistry for the MnO2/Mn2+ electrolysis are also anticipated to underlie a range of novel aqueous energy storage.
科研通智能强力驱动
Strongly Powered by AbleSci AI