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Title: Optimizing carbon/carbon supercapacitors in aqueous alkali sulfates electrolytes

Abstract

Neutral aqueous alkali sulfate has demonstrated great interests for developing environmentally friendly high voltage and high energy supercapacitors. This work focuses on systematically investigating the properties of symmetric carbon/carbon supercapacitors in neutral aqueous alkali sulfates. At room temperature, the largest power and energy density were obtained with K 2SO 4 electrolyte due to the smallest cation dimensions and highest electrical conductivity. At low temperature, aqueous Li 2SO 4 electrolyte presents the best performance due to the largest solubility, allowing a long-term stability at temperatures ranging between 20 °C and –10°C at a maximum voltage of 1.8 V. The excellent stability has been confirmed that capacitance retention achieves as high as 92% after 10,000 cycles. The capacitance variations with temperatures could essentially result from kinetic diffusion barrier, ion dimension changes and fewer pseudo-capacitance contributions under different temperatures. Here, this work highlights the selected virtues of different alkali sulfate electrolytes for enhanced supercapacitors.

Authors:
ORCiD logo [1]
  1. Univ. of Orleans, Orleans (France); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1505314
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Energy Chemistry
Additional Journal Information:
Journal Name: Journal of Energy Chemistry; Journal ID: ISSN 2095-4956
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Supercapacitor; Alkali sulfates electrolyte; Carbon; Temperature dependence

Citation Formats

Gao, Qiang. Optimizing carbon/carbon supercapacitors in aqueous alkali sulfates electrolytes. United States: N. p., 2019. Web. doi:10.1016/j.jechem.2019.03.037.
Gao, Qiang. Optimizing carbon/carbon supercapacitors in aqueous alkali sulfates electrolytes. United States. doi:10.1016/j.jechem.2019.03.037.
Gao, Qiang. Wed . "Optimizing carbon/carbon supercapacitors in aqueous alkali sulfates electrolytes". United States. doi:10.1016/j.jechem.2019.03.037.
@article{osti_1505314,
title = {Optimizing carbon/carbon supercapacitors in aqueous alkali sulfates electrolytes},
author = {Gao, Qiang},
abstractNote = {Neutral aqueous alkali sulfate has demonstrated great interests for developing environmentally friendly high voltage and high energy supercapacitors. This work focuses on systematically investigating the properties of symmetric carbon/carbon supercapacitors in neutral aqueous alkali sulfates. At room temperature, the largest power and energy density were obtained with K2SO4 electrolyte due to the smallest cation dimensions and highest electrical conductivity. At low temperature, aqueous Li2SO4 electrolyte presents the best performance due to the largest solubility, allowing a long-term stability at temperatures ranging between 20 °C and –10°C at a maximum voltage of 1.8 V. The excellent stability has been confirmed that capacitance retention achieves as high as 92% after 10,000 cycles. The capacitance variations with temperatures could essentially result from kinetic diffusion barrier, ion dimension changes and fewer pseudo-capacitance contributions under different temperatures. Here, this work highlights the selected virtues of different alkali sulfate electrolytes for enhanced supercapacitors.},
doi = {10.1016/j.jechem.2019.03.037},
journal = {Journal of Energy Chemistry},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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This content will become publicly available on April 3, 2020
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