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Mohamed, Saad Gomaa,Hussain, Iftikhar,Shim, Jae-Jin Royal Society of Chemistry 2018 Nanoscale Vol.10 No.14
<P>Carbon-containing NiCo2S4 hollow-nanoflake structures were fabricated by a one-step solvothermal method using CS2 as a single source for sulfidation and carbonization. The reaction mechanism for the hollow structure with carbon residues was explored based on the formation of a bis(dithiocarbamate)-metal complex and the Kirkendall effect during solvothermal synthesis. The NiCo2S4 nanoflake electrode exhibited a high specific capacitance of 1722 F g<SUP>−1</SUP> (specific capacity 688.8 C g<SUP>−1</SUP>) at a current density of 1 A g<SUP>−1</SUP> and an excellent cycling stability (capacity retention of 98.8% after 10 000 cycles). The as-fabricated asymmetric supercapacitor based on NiCo2S4 nanoflakes and activated carbon electrodes revealed a high energy density of 38.3 W h kg<SUP>−1</SUP> and a high power density of 8.0 kW kg<SUP>−1</SUP> with a capacitance retention of 91.5% and a coulombic efficiency of 95.6% after 5000 cycles, highlighting its great potential for practical supercapacitor applications.</P>
Iftikhar Hussain,Charmaine Lamiel,Saad Gomaa Mohamed,수부칼라이비자야쿠마르,Awais Ali,심재진 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
Rod-like zinc cobalt sulfide (ZCS) with controlled uniform structure was synthesized using a single-stephydrothermal method and its growth mechanism was investigated. A ZCS-based electrode showed anultrahigh capacitance of 2,418 F g 1 (967 C g 1) at 1 A g 1 with a good cycling stability of 83% after 10,000cycles. Moreover, an asymmetric ZCS-12//activated carbon supercapacitor, exhibited a high capacitanceof 142 F g 1 (227 C g 1) at 0.5 A g 1 and a high energy density of 51 Wh kg 1 and a high power density of8 kW kg 1, highlighting the next generation high performance supercapacitors.
Hussain, Iftikhar,Ali, Awais,Lamiel, Charmaine,Mohamed, Saad Gomaa,Sahoo, Sumanta,Shim, Jae-Jin The Royal Society of Chemistry 2019 Dalton Transactions Vol.48 No.12
<P>Supercapacitors are one of the most promising renewable-energy storage systems. In this study, a three-dimensional walking palm-like core-shell CoMoO4@NiCo2S4@nickel foam (NF) nanostructure was synthesized using a two-step hydrothermal method for high electrochemical performance. The as-prepared composite exhibited a high areal capacitance of 17.0 F cm<SUP>−2</SUP> (2433 F g<SUP>−1</SUP>) at a current density of 5 mA cm<SUP>−2</SUP> in a three-electrode system. The results revealed outstanding cycling stability of 114% after 10 000 charge-discharge cycles. An aqueous asymmetric supercapacitor device assembled with CoMoO4@NiCo2S4@NF and activated carbon (AC)@NF as the positive and negative electrodes, respectively, showed a high capacitance of 4.19 F cm<SUP>−2</SUP> (182 F g<SUP>−1</SUP>) and delivered a high energy density of 60.2 W h kg<SUP>−1</SUP> at a power density of 188 W kg<SUP>−1</SUP> and a high power density of 1.5 kW kg<SUP>−1</SUP> at an energy density 29.2 W h kg<SUP>−1</SUP>, lighting 22 parallel-connected red light emitting diodes for over 60 s. The synergistic effects of the core-shell CoMoO4@NiCo2S4@NF electrode material highlight the potential of this composite as an effective active material for supercapacitor applications.</P>