Substrate dependent self-organization of mesoporous cobalt oxide nanowires with remarkable pseudocapacitance

Handle URI:
http://hdl.handle.net/10754/562184
Title:
Substrate dependent self-organization of mesoporous cobalt oxide nanowires with remarkable pseudocapacitance
Authors:
Baby, Rakhi Raghavan; Chen, Wei; Cha, Dong Kyu; Alshareef, Husam N. ( 0000-0001-5029-2142 )
Abstract:
A scheme of current collector dependent self-organization of mesoporous cobalt oxide nanowires has been used to create unique supercapacitor electrodes, with each nanowire making direct contact with the current collector. The fabricated electrodes offer the desired properties of macroporosity to allow facile electrolyte flow, thereby reducing device resistance and nanoporosity with large surface area to allow faster reaction kinetics. Co 3O 4 nanowires grown on carbon fiber paper collectors self-organize into a brush-like morphology with the nanowires completely surrounding the carbon microfiber cores. In comparison, Co 3O 4 nanowires grown on planar graphitized carbon paper collectors self-organize into a flower-like morphology. In three electrode configuration, brush-like and flower-like morphologies exhibited specific capacitance values of 1525 and 1199 F/g, respectively, at a constant current density of 1 A/g. In two electrode configuration, the brush-like nanowire morphology resulted in a superior supercapacitor performance with high specific capacitances of 911 F/g at 0.25 A/g and 784 F/g at 40 A/g. In comparison, the flower-like morphology exhibited lower specific capacitance values of 620 F/g at 0.25 A/g and 423 F/g at 40 A/g. The Co 3O 4 nanowires with brush-like morphology exhibited high values of specific power (71 kW/kg) and specific energy (81 Wh/kg). Maximum energy and power densities calculated for Co 3O 4 nanowires with flower-like morphology were 55 Wh/kg and 37 kW/kg respectively. Both electrode designs exhibited excellent cycling stability by retaining ∼91-94% of their maximum capacitance after 5000 cycles of continuous charge-discharge. © 2012 American Chemical Society.
KAUST Department:
Materials Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Advanced Membranes and Porous Materials Research Center; Core Labs; Functional Nanomaterials and Devices Research Group
Publisher:
American Chemical Society (ACS)
Journal:
Nano Letters
Issue Date:
9-May-2012
DOI:
10.1021/nl300779a
Type:
Article
ISSN:
15306984
Sponsors:
Authors acknowledge the help from Analytical Chemistry Core Lab (KAUST) in BET measurements and Imaging and Characterization Laboratory (KAUST) for X-ray diffraction, TEM, and SEM measurements. H.N.A. acknowledges the generous support from the KAUST baseline fund.
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorBaby, Rakhi Raghavanen
dc.contributor.authorChen, Weien
dc.contributor.authorCha, Dong Kyuen
dc.contributor.authorAlshareef, Husam N.en
dc.date.accessioned2015-08-03T09:46:44Zen
dc.date.available2015-08-03T09:46:44Zen
dc.date.issued2012-05-09en
dc.identifier.issn15306984en
dc.identifier.doi10.1021/nl300779aen
dc.identifier.urihttp://hdl.handle.net/10754/562184en
dc.description.abstractA scheme of current collector dependent self-organization of mesoporous cobalt oxide nanowires has been used to create unique supercapacitor electrodes, with each nanowire making direct contact with the current collector. The fabricated electrodes offer the desired properties of macroporosity to allow facile electrolyte flow, thereby reducing device resistance and nanoporosity with large surface area to allow faster reaction kinetics. Co 3O 4 nanowires grown on carbon fiber paper collectors self-organize into a brush-like morphology with the nanowires completely surrounding the carbon microfiber cores. In comparison, Co 3O 4 nanowires grown on planar graphitized carbon paper collectors self-organize into a flower-like morphology. In three electrode configuration, brush-like and flower-like morphologies exhibited specific capacitance values of 1525 and 1199 F/g, respectively, at a constant current density of 1 A/g. In two electrode configuration, the brush-like nanowire morphology resulted in a superior supercapacitor performance with high specific capacitances of 911 F/g at 0.25 A/g and 784 F/g at 40 A/g. In comparison, the flower-like morphology exhibited lower specific capacitance values of 620 F/g at 0.25 A/g and 423 F/g at 40 A/g. The Co 3O 4 nanowires with brush-like morphology exhibited high values of specific power (71 kW/kg) and specific energy (81 Wh/kg). Maximum energy and power densities calculated for Co 3O 4 nanowires with flower-like morphology were 55 Wh/kg and 37 kW/kg respectively. Both electrode designs exhibited excellent cycling stability by retaining ∼91-94% of their maximum capacitance after 5000 cycles of continuous charge-discharge. © 2012 American Chemical Society.en
dc.description.sponsorshipAuthors acknowledge the help from Analytical Chemistry Core Lab (KAUST) in BET measurements and Imaging and Characterization Laboratory (KAUST) for X-ray diffraction, TEM, and SEM measurements. H.N.A. acknowledges the generous support from the KAUST baseline fund.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectCo 3O 4 nanowiresen
dc.subjectself-organizationen
dc.subjectspecific capacitanceen
dc.subjectSubstrate-dependenten
dc.subjectsupercapacitoren
dc.titleSubstrate dependent self-organization of mesoporous cobalt oxide nanowires with remarkable pseudocapacitanceen
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentCore Labsen
dc.contributor.departmentFunctional Nanomaterials and Devices Research Groupen
dc.identifier.journalNano Lettersen
kaust.authorBaby, Rakhi Raghavanen
kaust.authorCha, Dong Kyuen
kaust.authorAlshareef, Husam N.en
kaust.authorChen, Weien
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