Cost-Effective MIL-53(Cr) metal–organic framework-based supercapacitors encompassing fast-ion (Li+/H+/Na+) conductors
File(s)
Accepted version
Author(s)
Ojha, Manoranjan
Wu, Billy
Deepa, Melepurath
Type
Journal Article
Abstract
A chromium-based low-cost metal–organic framework (MOF) cathode, MIL (Matériaux de l′Institut Lavoisier)-53(Cr), is coupled with a bioderived porous carbon (BPC) anode, produced from abundantly available agricultural waste betel nut shells in an asymmetric supercapacitor, for the first time. The impact of the electrolyte on the electrochemical behavior of an asymmetric BPC//MIL-53(Cr) supercapacitor was assessed by constructing cells with the following electrolytes: proton-conducting camphorsulfonic acid (CSA), Li+-ion-conducting solutions of LiClO4, Na+-ion-conducting sodium poly(4-styrene sulfonate) solution, and ionic liquid (IL:1-butyl-1-methyl-pyrrolidinium trifluoromethanesulfonate)-based solutions. The aqueous H+-ion-based CSA electrolyte shows a superior ionic conductivity (270 mS cm–1) and an enhanced transport number (0.96), carries larger ionic currents, and retains high conductivity even at subambient temperatures, clearly outperforming all the other Li+/Na+/IL electrolytes. The BPC/aqueous CSA or LiClO4/MIL-53(Cr) supercapacitors show enhanced storage performances, with the H+ cell having a specific capacitance of 70 F g–1 and energy and power density maxima of 9.7 Wh kg–1 and 0.25 kW kg–1 and enduring 104 cycles. A detailed account of the dependence of the electrolyte cation/anion- and solvent-type on electrochemical charge storage provides a basis for adapting these design principles to developing high-performance MOF-based supercapacitors.
Date Issued
2021-05-24
Date Acceptance
2021-04-30
Citation
ACS Applied Energy Materials, 2021, 4 (5), pp.4729-4743
ISSN
2574-0962
Publisher
American Chemical Society (ACS)
Start Page
4729
End Page
4743
Journal / Book Title
ACS Applied Energy Materials
Volume
4
Issue
5
Copyright Statement
© 2021 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Energy Materials, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsaem.1c00348
Sponsor
Engineering & Physical Science Research Council (E
Identifier
https://pubs.acs.org/doi/10.1021/acsaem.1c00348
Grant Number
J15119 - PO:500174140
Publication Status
Published
Article Number
acsaem.1c00348
Date Publish Online
2021-05-11