Enhanced rate performance of mesoporous Co3O4 nanosheet supercapacitor electrodes by hydrous RuO2 nanoparticle decoration

Handle URI:
http://hdl.handle.net/10754/563457
Title:
Enhanced rate performance of mesoporous Co3O4 nanosheet supercapacitor electrodes by hydrous RuO2 nanoparticle decoration
Authors:
Baby, Rakhi Raghavan; Chén, Wěi; Hedhili, Mohamed N. ( 0000-0002-3624-036X ) ; Cha, Dong Kyu; Alshareef, Husam N. ( 0000-0001-5029-2142 )
Abstract:
Mesoporous cobalt oxide (Co3O4) nanosheet electrode arrays are directly grown over flexible carbon paper substrates using an economical and scalable two-step process for supercapacitor applications. The interconnected nanosheet arrays form a three-dimensional network with exceptional supercapacitor performance in standard two electrode configuration. Dramatic improvement in the rate capacity of the Co3O4 nanosheets is achieved by electrodeposition of nanocrystalline, hydrous RuO 2 nanoparticles dispersed on the Co3O4 nanosheets. An optimum RuO2 electrodeposition time is found to result in the best supercapacitor performance, where the controlled morphology of the electrode provides a balance between good conductivity and efficient electrolyte access to the RuO2 nanoparticles. An excellent specific capacitance of 905 F/g at 1 A/g is obtained, and a nearly constant rate performance of 78% is achieved at current density ranging from 1 to 40 A/g. The sample could retain more than 96% of its maximum capacitance even after 5000 continuous charge-discharge cycles at a constant high current density of 10 A/g. Thicker RuO2 coating, while maintaining good conductivity, results in agglomeration, decreasing electrolyte access to active material and hence the capacitive performance. © 2014 American Chemical Society.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Imaging and Characterization Core Lab; Materials Science and Engineering Program; Core Labs; Functional Nanomaterials and Devices Research Group
Publisher:
American Chemical Society (ACS)
Journal:
ACS Applied Materials & Interfaces
Issue Date:
26-Mar-2014
DOI:
10.1021/am405849n
PubMed ID:
24580967
Type:
Article
ISSN:
19448244
Sponsors:
Authors thank Advanced nanofabricationNanofabrication, Imaging and Characterization Laboratory and Analytical Chemistry Core Laboratory at KAUST and Olga Zausalina for the graphical illustration design. R.B.R. acknowledges the financial support from SABIC Post-Doctoral Fellowship. W.C. acknowledges support from KAUST Graduate Fellowship. H.N.A. acknowledges the generous support from KAUST Baseline Fund.
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorBaby, Rakhi Raghavanen
dc.contributor.authorChén, Wěien
dc.contributor.authorHedhili, Mohamed N.en
dc.contributor.authorCha, Dong Kyuen
dc.contributor.authorAlshareef, Husam N.en
dc.date.accessioned2015-08-03T11:51:59Zen
dc.date.available2015-08-03T11:51:59Zen
dc.date.issued2014-03-26en
dc.identifier.issn19448244en
dc.identifier.pmid24580967-
dc.identifier.doi10.1021/am405849nen
dc.identifier.urihttp://hdl.handle.net/10754/563457en
dc.description.abstractMesoporous cobalt oxide (Co3O4) nanosheet electrode arrays are directly grown over flexible carbon paper substrates using an economical and scalable two-step process for supercapacitor applications. The interconnected nanosheet arrays form a three-dimensional network with exceptional supercapacitor performance in standard two electrode configuration. Dramatic improvement in the rate capacity of the Co3O4 nanosheets is achieved by electrodeposition of nanocrystalline, hydrous RuO 2 nanoparticles dispersed on the Co3O4 nanosheets. An optimum RuO2 electrodeposition time is found to result in the best supercapacitor performance, where the controlled morphology of the electrode provides a balance between good conductivity and efficient electrolyte access to the RuO2 nanoparticles. An excellent specific capacitance of 905 F/g at 1 A/g is obtained, and a nearly constant rate performance of 78% is achieved at current density ranging from 1 to 40 A/g. The sample could retain more than 96% of its maximum capacitance even after 5000 continuous charge-discharge cycles at a constant high current density of 10 A/g. Thicker RuO2 coating, while maintaining good conductivity, results in agglomeration, decreasing electrolyte access to active material and hence the capacitive performance. © 2014 American Chemical Society.en
dc.description.sponsorshipAuthors thank Advanced nanofabricationNanofabrication, Imaging and Characterization Laboratory and Analytical Chemistry Core Laboratory at KAUST and Olga Zausalina for the graphical illustration design. R.B.R. acknowledges the financial support from SABIC Post-Doctoral Fellowship. W.C. acknowledges support from KAUST Graduate Fellowship. H.N.A. acknowledges the generous support from KAUST Baseline Fund.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectelectrodepositionen
dc.subjectrate performanceen
dc.subjectspecific capacitanceen
dc.subjectsupercapacitoren
dc.titleEnhanced rate performance of mesoporous Co3O4 nanosheet supercapacitor electrodes by hydrous RuO2 nanoparticle decorationen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentImaging and Characterization Core Laben
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentCore Labsen
dc.contributor.departmentFunctional Nanomaterials and Devices Research Groupen
dc.identifier.journalACS Applied Materials & Interfacesen
kaust.authorBaby, Rakhi Raghavanen
kaust.authorHedhili, Mohamed N.en
kaust.authorCha, Dong Kyuen
kaust.authorAlshareef, Husam N.en
kaust.authorChén, Wěien
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.