Influence of Surface Oxidation on Ion Dynamics and Capacitance in Porous and Nonporous Carbon Electrodes

Boris Dyatkin; Yu Zhang; Eugene Mamontov; Alexander I. Kolesnikov; Yongqiang Cheng; Harry M. Meyer III; Peter T. Cummings; Yury Gogotsi

doi:10.1021/acs.jpcc.6b01204

Influence of Surface Oxidation on Ion Dynamics and Capacitance in Porous and Nonporous Carbon Electrodes

Boris Dyatkin, Yu Zhang, Eugene Mamontov, Alexander I. Kolesnikov, Yongqiang Cheng, Harry M. Meyer III, Peter T. Cummings, Yury Gogotsi^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

48 Citations (Scopus)

Abstract

We investigate the influence of surface chemistry and ion confinement on capacitance and electrosorption dynamics of room-temperature ionic liquids (RTILs) in supercapacitors. Using air oxidation and vacuum annealing, we produced defunctionalized and oxygen-rich surfaces of carbide-derived carbons (CDCs) and graphene nanoplatelets (GNPs). While oxidized surfaces of porous CDCs improve capacitance and rate handling abilities of ions, defunctionalized nonporous GNPs improve charge storage densities on planar electrodes. Quasi-elastic neutron scattering (QENS) and inelastic neutron scattering (INS) probed the structure, dynamics, and orientation of RTIL ions confined in divergently functionalized pores. Oxidized, ionophilic surfaces draw ions closer to pore surfaces and enhance potential-driven ion transport during electrosorption. Molecular dynamics (MD) simulations corroborated experimental data and demonstrated the significance of surface functional groups on ion orientations, accumulation densities, and capacitance.

Original language	English
Pages (from-to)	8730-8741
Number of pages	12
Journal	Journal of Physical Chemistry C
Volume	120
Issue number	16
DOIs	https://doi.org/10.1021/acs.jpcc.6b01204
Publication status	Published - 28 Apr 2016

Keywords

Cations
Electrical Properties
Electrodes
Electrolytes
Ions

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/acs.jpcc.6b01204

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title = "Influence of Surface Oxidation on Ion Dynamics and Capacitance in Porous and Nonporous Carbon Electrodes",

abstract = "We investigate the influence of surface chemistry and ion confinement on capacitance and electrosorption dynamics of room-temperature ionic liquids (RTILs) in supercapacitors. Using air oxidation and vacuum annealing, we produced defunctionalized and oxygen-rich surfaces of carbide-derived carbons (CDCs) and graphene nanoplatelets (GNPs). While oxidized surfaces of porous CDCs improve capacitance and rate handling abilities of ions, defunctionalized nonporous GNPs improve charge storage densities on planar electrodes. Quasi-elastic neutron scattering (QENS) and inelastic neutron scattering (INS) probed the structure, dynamics, and orientation of RTIL ions confined in divergently functionalized pores. Oxidized, ionophilic surfaces draw ions closer to pore surfaces and enhance potential-driven ion transport during electrosorption. Molecular dynamics (MD) simulations corroborated experimental data and demonstrated the significance of surface functional groups on ion orientations, accumulation densities, and capacitance.",

keywords = "Cations, Electrical Properties, Electrodes, Electrolytes, Ions",

author = "Boris Dyatkin and Yu Zhang and Eugene Mamontov and Kolesnikov, \{Alexander I.\} and Yongqiang Cheng and \{Meyer III\}, \{Harry M.\} and Cummings, \{Peter T.\} and Yury Gogotsi",

note = "Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

year = "2016",

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doi = "10.1021/acs.jpcc.6b01204",

language = "English",

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T1 - Influence of Surface Oxidation on Ion Dynamics and Capacitance in Porous and Nonporous Carbon Electrodes

AU - Dyatkin, Boris

AU - Zhang, Yu

AU - Mamontov, Eugene

AU - Kolesnikov, Alexander I.

AU - Cheng, Yongqiang

AU - Meyer III, Harry M.

AU - Cummings, Peter T.

AU - Gogotsi, Yury

PY - 2016/4/28

Y1 - 2016/4/28

N2 - We investigate the influence of surface chemistry and ion confinement on capacitance and electrosorption dynamics of room-temperature ionic liquids (RTILs) in supercapacitors. Using air oxidation and vacuum annealing, we produced defunctionalized and oxygen-rich surfaces of carbide-derived carbons (CDCs) and graphene nanoplatelets (GNPs). While oxidized surfaces of porous CDCs improve capacitance and rate handling abilities of ions, defunctionalized nonporous GNPs improve charge storage densities on planar electrodes. Quasi-elastic neutron scattering (QENS) and inelastic neutron scattering (INS) probed the structure, dynamics, and orientation of RTIL ions confined in divergently functionalized pores. Oxidized, ionophilic surfaces draw ions closer to pore surfaces and enhance potential-driven ion transport during electrosorption. Molecular dynamics (MD) simulations corroborated experimental data and demonstrated the significance of surface functional groups on ion orientations, accumulation densities, and capacitance.

AB - We investigate the influence of surface chemistry and ion confinement on capacitance and electrosorption dynamics of room-temperature ionic liquids (RTILs) in supercapacitors. Using air oxidation and vacuum annealing, we produced defunctionalized and oxygen-rich surfaces of carbide-derived carbons (CDCs) and graphene nanoplatelets (GNPs). While oxidized surfaces of porous CDCs improve capacitance and rate handling abilities of ions, defunctionalized nonporous GNPs improve charge storage densities on planar electrodes. Quasi-elastic neutron scattering (QENS) and inelastic neutron scattering (INS) probed the structure, dynamics, and orientation of RTIL ions confined in divergently functionalized pores. Oxidized, ionophilic surfaces draw ions closer to pore surfaces and enhance potential-driven ion transport during electrosorption. Molecular dynamics (MD) simulations corroborated experimental data and demonstrated the significance of surface functional groups on ion orientations, accumulation densities, and capacitance.

KW - Cations

KW - Electrical Properties

KW - Electrodes

KW - Electrolytes

KW - Ions

UR - https://www.scopus.com/pages/publications/84966378321

U2 - 10.1021/acs.jpcc.6b01204

DO - 10.1021/acs.jpcc.6b01204

M3 - Article

AN - SCOPUS:84966378321

SN - 1932-7447

VL - 120

SP - 8730

EP - 8741

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 16

ER -

Influence of Surface Oxidation on Ion Dynamics and Capacitance in Porous and Nonporous Carbon Electrodes

Abstract

Keywords

ASJC Scopus subject areas

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