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Ghosh, Subrata,Polaki, S.R.,Sahoo, Gopinath,Jin, En-Mei,Kamruddin, M.,Cho, Jung Sang,Jeong, Sang Mun Elsevier 2019 Journal of industrial and engineering chemistry Vol.72 No.-
<P><B>Abstract</B></P> <P>The asymmetric electrochemical capacitor was realized by MnO<SUB>2</SUB>/Vertical graphene nanosheets (VGN) and Fe<SUB>2</SUB>O<SUB>3</SUB>/VGN as positive and negative electrodes, respectively. The surface of VGN skeleton is independently decorated with MnO<SUB>2</SUB> having sponge gourd-like morphology and Fe<SUB>2</SUB>O<SUB>3</SUB> having nanorice like morphology. Both the electrodes have shown around 250 times higher charge-storage capacity than the bare VGN (0.47mF/cm<SUP>2</SUP>) with the specific capacitance of 118 (MnO<SUB>2</SUB>/VGN) and 151mF/cm<SUP>2</SUP> (Fe<SUB>2</SUB>O<SUB>3</SUB>/VGN). The fabricated asymmetric device exhibited a specific capacitance of 76mF/cm<SUP>2</SUP> and energy density of 71μWh/cm<SUP>2</SUP> with an excellent electrochemical stability up to 12,000 cycles, over a potential window of 2.6V.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Metal oxide-vertical graphene electrodes were prepared. </LI> <LI> Metal oxide-vertical graphene nanoshees structure was found to be super-hydrophilic. </LI> <LI> A plausible formation mechanism of metal oxides on the surface of vertical graphene is propsed. </LI> <LI> As fabricated asymmetric supercapacitor device was operated in an extended window of 2.6V. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Subrata Ghosh,S.R. Polaki,Gopinath Sahoo,En Mei Jin,M. Kamruddin,조정상,정상문 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
The asymmetric electrochemical capacitor was realized by MnO2/Vertical graphene nanosheets (VGN)and Fe2O3/VGN as positive and negative electrodes, respectively. The surface of VGN skeleton isindependently decorated with MnO2 having sponge gourd-like morphology and Fe2O3 having nanoricelike morphology. Both the electrodes have shown around 250 times higher charge-storage capacity thanthe bare VGN (0.47 mF/cm2) with the specific capacitance of 118 (MnO2/VGN) and 151 mF/cm2 (Fe2O3/VGN). The fabricated asymmetric device exhibited a specific capacitance of 76 mF/cm2 and energydensity of 71 mWh/cm2 with an excellent electrochemical stability up to 12,000 cycles, over a potentialwindow of 2.6 V.