Substrate Effects in Graphene-Based Electric Double-Layer Capacitors: The Pivotal Interplays between Ions and Solvents

Yang Huachao; Bo Zheng; Yang Jinyuan; Kong Jing; Chen Xia; Yan Jianhua; Cen Kefa

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Substrate Effects in Graphene-Based Electric Double-Layer Capacitors: The Pivotal Interplays between Ions and Solvents

机译：基于石墨烯的电双层电容器中的基材效应：离子和溶剂之间的枢转相互作用

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摘要

Graphene has been considered as a promising active material for electric double-layer capacitors (EDLCs), primarily owing to its extraordinary monolayer properties, whereas the interfacial behaviors are conspicuously impacted by underlying substrates. In this work, substrate effects on the interfacial wettability, EDL structure, and capacitive behavior of graphene-based EDLCs are delineated with numerical simulation. Unlike previous studies, a partial wetting transparency of topmost graphene is recognized for hydrophilic supports. In particular, a virtually identical capacitance is demonstrated for graphene with various supports, albeit the substantially different EDL structures stemmed from substrate effects. The achieved invariant capacitance is prominently attributed to the counterbalancing correlations between ions and proximal solvents, going beyond traditional views of modulating capacitance preferentially through ion structural evolutions. Specifically, the suppressed permittivity of apparently ordered water dipoles (i.e. detrimental solvent effects) attenuates the beneficial ionic influences ( i.e. reinforced population and closer approach) on shielding the external electric fields. Theas-obtained findings demonstrate the paramount importance of the substrate in mediating interfacial behaviors within electrified EDLC systems and highlight that exploiting the pivotal interplay between ions and solvents could be a novel avenue to further manipulate electrochemical performances.

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来源
《ChemElectroChem》 |2017年第11期|共9页
作者
Yang Huachao; Bo Zheng; Yang Jinyuan; Kong Jing; Chen Xia; Yan Jianhua; Cen Kefa;
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作者单位

Zhejiang Univ Coll Energy Engn Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Energy Engn Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Energy Engn Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Energy Engn Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Energy Engn Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Energy Engn Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

Zhejiang Univ Coll Energy Engn Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

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正文语种 eng
中图分类物理化学（理论化学）、化学物理学;
关键词
Graphene; substrate effects; interfacial property; molecular dynamics simulation; electric double-layer capacitors;

机译：石墨烯;底物效应;界面性质;分子动力学仿真;电双层电容器;

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Substrate Effects in Graphene-Based Electric Double-Layer Capacitors: The Pivotal Interplays between Ions and Solvents

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