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Molecular Origin of Electric Double-Layer Capacitance at Multilayer Graphene Edges
Ist Teil von
The journal of physical chemistry letters, 2017-01, Vol.8 (1), p.153-160
Ort / Verlag
United States: American Chemical Society
Erscheinungsjahr
2017
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Multilayer graphenes have been widely used as active materials for electric double-layer capacitors (EDLCs), where their numerous edges are demonstrated to play a crucial role in charge storage. In this work, the interfacial structure and capacitive behaviors of multilayer graphene edges with representative interlayer spacing are studied via molecular dynamics (MD) simulations. Compared with planar graphite surfaces, edges can achieve a 2-fold increase in the specific capacitance at a wider interlayer spacing of ∼5.0 Å. Unusually, the molecular origins for achieved charge storage are predominantly attributed to the structural evolutions of solvents occurring in the double layer, going beyond the traditional views of regulating the capacitance by ion adsorption/separation. Specifically, diverse ionic distributions exhibit similar screening ability and EDLC thickness, while water molecules can counterbalance the interfacial electric fields more effectively at edge site. The as-obtained findings will be instructive in designing graphene-based EDLCs for advanced capacitive performances.
Sprache
Englisch
Identifikatoren
ISSN: 1948-7185
eISSN: 1948-7185
DOI: 10.1021/acs.jpclett.6b02659
Titel-ID: cdi_proquest_miscellaneous_1852681551
Format
–
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