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High energy density performance of hydrothermally produced hydrous ruthenium oxide/multiwalled carbon nanotubes composite: Design of an asymmetric supercapacitor with excellent cycle life

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Journal of Energy Chemistry 2016年第4期25卷 627-635页

作者： K.Chaitra P.Sivaraman r.t.vinny Umananda M.Bhatta N.Nagaraju N.Kathyayini Department of Nanobiosciences Centre for Emerging TechnologiesJain Global CampusJain UniversityJakkasandra postKanakapura TalukRamanagara District Naval Materials research Laboratory Department of Chemistry St.Joseph's College

Hydrous ruthenium oxide(h-ru O) nanoparticles and its composite with multiwalled carbon nanotubes(h-ru O/MWCNt) were synthesized by a simple hydrothermal method and proved to have potential application as hybrid supercapacitor material.the h-ru Oand h-ru O/MWCNt were characterized for their physico-chemical properties by PXrD,BEt surface area,raman,SEM-EDS and tEM techniques.the electrochemical performance of the materials were investigated,specific capacitance(Cs) of h-ru Oand hru O/MWCNt estimated by their cyclic voltammetric studies were found to be 604 and 1585 F/g respectively at a scan rate of 2 m V/s in the potential range 0–1.2 V.Further,this value was found to be nearly three times higher than that of pure h-ru O.An asymmetric supercapacitor(AS) device was fabricated by employing h-ru O/MWCNt as the positive electrode and activated carbon as the negative electrode.the device exhibited Cs of 61.8 F/g at a scan rate of 2 m V/s.Further,the device showed excellent long term stability for 20,000 cycles with 88% capacitance retention at a high current density of 25 A/g.

关键词： Carbon nanotubes Hybrid composites Asymmetric supercapacitors Cycle life

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KOH activated carbon derived from biomass-banana fibers as an efficient negative electrode in high performance asymmetric supercapacitor

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Journal of Energy Chemistry 2017年第1期26卷 56-62页

作者： ChaitraK vinny r t Sivaraman P Narendra reddy Chunyan Hu Krishna Venkatesh Vivek C S Nagaraju N Kathyayini N Department of Nanobiosciences Centre for Emerging TechnologiesJain Global CampusJain UniversityJakkasandra postKanakapura TalukRamanagara DistrictBangalore Rural 562112 KarnatakaIndia Naval Materials research Laboratory DRDOAmbernathThane 421506India Department of Chemistry St.Joseph’s College P.G.Centre.46Langford RoadShanthinagarBangaloreKarnataka 560027India research resource Centre Visveswaraya Technological UniversityBelagaviIndia College of Chemistry Chemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China National Engineering research Center for Dyeing and Finishing of textiles Donghua UniversityShanghai 201620China

Here we demonstrate the fabrication, electrochemical performance and application of an asymmetric supercapacitor (AS) device constructed with ss-Ni(OH)(2)/MWCNts as positive electrode and KOH activated honeycomb-like porous carbon (K-PC) derived from banana fibers as negative electrode. Initially, the electrochemical performance of hydrothermally synthesized ss-Ni(OH)(2)/MWCNts nanocomposite and K-PC was studied in a three-electrode system using 1 M KOH. these materials exhibited a specific capacitance (Cs) of 1327 Fig and 324 F/g respectively at a scan rate of 10 mV/s. Further, the AS device i.e., ss-Ni(OH)(2)/MWCNts// K-PC in 1 M KOH solution, demonstrated a Cs of 156 F/g at scan rate of 10 mV/s in a broad cell voltage of 0-2.2 V. the device demonstrated a good rate capability by maintaining a Cs of 59 F/g even at high current density (25 A/g). the device also offered high energy density of 63 Wh/kg with maximum power density of 5.2 kW/kg. the AS device exhibited excellent cycle life with 100% capacitance retention at 5000th cycle at a high current density of 25 A/g. two AS devices connected in series were employed for powering a pair of LEDs of different colors and also a mini fan. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Asymmetric supercapacitor device Activated porous carbon High energy density Cyclability Power source

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