期刊
ACS NANO
卷 14, 期 2, 页码 2395-2403出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b09648
关键词
supercapacitor; nanoporous electrode; ionic liquid; charging dynamics; charge storage mechanism; ion structure transition
类别
资金
- National Natural Science Foundation of China [51876072, 51836003]
- Fundamental Research Funds for the Central Universities [20191dyXMBZ040]
- Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
Using electrodes with subnanometer pores and ionic liquid electrolytes can improve the charge storage capacity at the expense of the charging rate. The fundamental understanding of the charging dynamics of nanoporous electrodes can help to avoid compromising the power density. In this work, we performed molecular dynamics simulations to reveal the charging mechanism of subnanometer pores in ionic liquids. Different from the traditional view that a smaller pore results in slower charging, a non-monotonic relation is found between the charging rate and pore size, in which the charging process is accelerated in some subnanometer pores. Our analysis uncovers that the mechanism of the charging enhancement can be attributed to the transition of in-pore ion structure.
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