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Supercapacitors Based on Reduced Graphene Oxide Nanofibers Supported Ni(OH)2 Nanoplates with Enhanced Electrochemical Performance
journal contribution
posted on 2016-08-04, 00:00 authored by Chaoqi Zhang, Qidi Chen, Hongbing ZhanPseudocapacitive
materials are critical to the development of supercapacitors but usually
suffer from poor conductivity and bad cycling property. Here, we describe
the production of novel graphene oxide nanofibers (GONFs) via a partial
oxidization and exfoliation method and concurrently report that highly
crystallized Ni(OH)2 nanoplates uniformly grow on reduced
GONFs’ outer graphene nanosheets through the hydrothermal method.
Because of their unique structure with high electric conductivity,
the rGONF/Ni(OH)2 composite exhibits superior specific
capacitance (SC), favorable rate capability and enhanced cycling stability
relative to other composites or hybrids, e.g., 1433 F g–1 at 5 mV s–1 scan rate, 986 F g–1 at 40 mV s–1, and 90.5% capacitance retention
after 2000 cycles, and as-fabricated rGONF/Ni(OH)2//active
carbon asymmetric supercapacitor (ASC) exhibits a remarkable energy
density and a 85.3% high retention (44.1 Wh kg–1 at 467 W kg–1 and 37.6 Wh kg–1 at 3185 W kg–1) with a wide potential window of
0–1.7 V. Therefore,
this study shows that rGONFs offers an exciting opportunity as substrate
materials for supercapacior applications and opens up a new pathway
for design and manufacture of novel supercapacitor electrode materials.
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cycling propertyretentionWhsubstrate materialsconductivityrate capability2000 cyclesEnhanced Electrochemical Performance Pseudocapacitive materialsReduced Graphene Oxide NanofibersNiGONF40 mVcycling stabilityASCcapacitanceenergy densityhydrothermal methodnovel supercapacitor electrode materialsSCexhibitnovel graphene oxide nanofibersgraphene nanosheets5 mVrGONFexfoliation methodsupercapacior applicationskg