Conformal coating of Ni(OH)2 nanoflakes on carbon fibers by chemical bath deposition for efficient supercapacitor electrodes

Handle URI:
http://hdl.handle.net/10754/562548
Title:
Conformal coating of Ni(OH)2 nanoflakes on carbon fibers by chemical bath deposition for efficient supercapacitor electrodes
Authors:
Alhebshi, Nuha ( 0000-0002-2573-7979 ) ; Baby, Rakhi Raghavan; Alshareef, Husam N. ( 0000-0001-5029-2142 )
Abstract:
A novel supercapacitor electrode structure has been developed in which a uniform and conformal coating of nanostructured Ni(OH)2 flakes on carbon microfibers is deposited in situ by a simple chemical bath deposition process at room temperature. The microfibers conformally coated with Ni(OH) 2 nanoflakes exhibit five times higher specific capacitance compared to planar (non-conformal) Ni(OH)2 nanoflake electrodes prepared by drop casting of Ni(OH)2 powder on the carbon microfibers (1416 F g-1vs. 275 F g-1). This improvement in supercapacitor performance can be ascribed to the preservation of the three-dimensional structure of the current collector, which is a fibrous carbon fabric, even after the conformal coating of Ni(OH)2 nanoflakes. The 3-D network morphology of the fibrous carbon fabric leads to more efficient electrolyte penetration into the conformal electrode, allowing the ions to have greater access to active reaction sites. Cyclic stability testing of the conformal and planar Ni(OH)2 nanoflake electrodes, respectively, reveals 34% and 62% drop in specific capacitance after 10 000 cycles. The present study demonstrates the crucial effect that electrolyte penetration plays in determining the pseudocapacitive properties of the supercapacitor electrodes. © 2013 The Royal Society of Chemistry.
KAUST Department:
Materials Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Functional Nanomaterials and Devices Research Group
Publisher:
Royal Society of Chemistry
Journal:
Journal of Materials Chemistry A
Issue Date:
2013
DOI:
10.1039/c3ta12936e
Type:
Article
ISSN:
20507488
Sponsors:
The authors acknowledge Dr Dongkyu Cha, Research Scientist at KAUST Advanced Nano Imaging and Characterization Laboratory (ANIC), for his help in TEM characterization, and Dr Omar El Tall, Research Specialist at KAUST Analytical Core Lab (ACL), for his help in physisorption experiments. Nuha A. Alhebshi acknowledges the support from the KAUST Graduate Fellowship. R. B. Rakhi acknowledges the support from SABIC Postdoctoral Fellowship.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorAlhebshi, Nuhaen
dc.contributor.authorBaby, Rakhi Raghavanen
dc.contributor.authorAlshareef, Husam N.en
dc.date.accessioned2015-08-03T10:42:14Zen
dc.date.available2015-08-03T10:42:14Zen
dc.date.issued2013en
dc.identifier.issn20507488en
dc.identifier.doi10.1039/c3ta12936een
dc.identifier.urihttp://hdl.handle.net/10754/562548en
dc.description.abstractA novel supercapacitor electrode structure has been developed in which a uniform and conformal coating of nanostructured Ni(OH)2 flakes on carbon microfibers is deposited in situ by a simple chemical bath deposition process at room temperature. The microfibers conformally coated with Ni(OH) 2 nanoflakes exhibit five times higher specific capacitance compared to planar (non-conformal) Ni(OH)2 nanoflake electrodes prepared by drop casting of Ni(OH)2 powder on the carbon microfibers (1416 F g-1vs. 275 F g-1). This improvement in supercapacitor performance can be ascribed to the preservation of the three-dimensional structure of the current collector, which is a fibrous carbon fabric, even after the conformal coating of Ni(OH)2 nanoflakes. The 3-D network morphology of the fibrous carbon fabric leads to more efficient electrolyte penetration into the conformal electrode, allowing the ions to have greater access to active reaction sites. Cyclic stability testing of the conformal and planar Ni(OH)2 nanoflake electrodes, respectively, reveals 34% and 62% drop in specific capacitance after 10 000 cycles. The present study demonstrates the crucial effect that electrolyte penetration plays in determining the pseudocapacitive properties of the supercapacitor electrodes. © 2013 The Royal Society of Chemistry.en
dc.description.sponsorshipThe authors acknowledge Dr Dongkyu Cha, Research Scientist at KAUST Advanced Nano Imaging and Characterization Laboratory (ANIC), for his help in TEM characterization, and Dr Omar El Tall, Research Specialist at KAUST Analytical Core Lab (ACL), for his help in physisorption experiments. Nuha A. Alhebshi acknowledges the support from the KAUST Graduate Fellowship. R. B. Rakhi acknowledges the support from SABIC Postdoctoral Fellowship.en
dc.publisherRoyal Society of Chemistryen
dc.titleConformal coating of Ni(OH)2 nanoflakes on carbon fibers by chemical bath deposition for efficient supercapacitor electrodesen
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentFunctional Nanomaterials and Devices Research Groupen
dc.identifier.journalJournal of Materials Chemistry Aen
kaust.authorAlhebshi, Nuhaen
kaust.authorBaby, Rakhi Raghavanen
kaust.authorAlshareef, Husam N.en
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