Kinetic-Dominated Charging Mechanism within Representative Aqueous Electrolyte-based Electric Double-Layer Capacitors 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Journal of physical chemistry letters
年/卷/期
2017 / 8 / 15
页码
3703-3710
ISSN号
1948-7185
作者单位
Zhejiang Univ, Inst Thermal Power Engn, Coll Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;Zhejiang Univ, Inst Thermal Power Engn, Coll Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;Zhejiang Univ, Inst Thermal Power Engn, Coll Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;Zhejiang Univ, Inst Thermal Power Engn, Coll Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;Zhejiang Univ, Inst Thermal Power Engn, Coll Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;Zhejiang Univ, Inst Thermal Power Engn, Coll Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;Zhejiang Univ, Inst Thermal Power Engn, Coll Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;Zhejiang Univ, Inst Thermal Power Engn, Coll Energy Engn, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China;
作者
Yang, Huachao;Yang, Jinyuan;Bo, Zheng;Chen, Xia;Shuai, Xiaorui;Kong, Jing;Yan, Jianhua;Cen, Kefa;
摘要
The chemical nature of electrolytes has been demonstrated to play a pivotal role in the charge storage of electric double-layer capacitors (EDLCs), whereas primary mechanisms are still partially resolved but controversial. In this work, a systematic exploration into EDL structures and kinetics of representative aqueous electrolytes is performed with numerical simulation and experimental research. Unusually, a novel charging mechanism exclusively predominated by kinetics is recognized, going beyond traditional views of manipulating capacitances preferentially via interfacial structural variations. Specifically, strikingly distinctive EDL structures stimulated by diverse ion sizes, valences, and mixtures manifest a virtually identical EDL capacitance, where the dielectric nature of solvents attenuates ionic effects on electrolyte redistributions, in stark contradiction with solvent-free counterpart and traditional Helmholtz theory. Meanwhile, corresponding kinetics evolve conspicuously with ionic species, intimately correlated with ion solvent interactions. The achieved mechanisms are subsequently illuminated by electrochemical measurements, highlighting the crucial interplay between ions and solvents in regulating EDLC performances.
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