Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 812, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152126
Keywords
Nickel sulfide; CNT; Supercapacitor and OER
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Funding
- Department of Science and Technology Science and Engineering Research Board, India [PDF/2016/000859]
- DST-SERB through the EMR scheme [EMR/2016/005888]
- DST-FIST (fund for improvement of S&T infrastructure) [SR/FST/CST-266/2015(c)]
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In this work, three-dimensional hetero-nanostructures comprising nickel sulfide/nickel hydroxide and multiwalled carbon nanotubes have been synthesized using hydrothermal method for energy conversion and storage application. As-prepared NiS2-Ni(OH)(2)/CNT composite shows excellent storage properties with a specific capacitance of 1250 F/g with pseudocapacitive behavior. Interestingly, NiS2-Ni(OH)(2)/10% CNT electrode exhibited better cycling stability with 80% retention of specific capacitance after 3000 cycles at a current density of 5 A/g. Further, when employed as oxygen evolution reaction (OER) catalyst, NiS2-Ni(OH)(2)/10%CNT composite electrode exhibits an OER onset potential of 1.45 V vs reversible hydrogen electrode (RHE) and it can catalyze OER efficiently with the overpotential of 290 mV to generate 10 mA/cm(2) current density (with a lower Tafel slope 110 mV/decade) in an alkaline solution. The stability studies also confirm an excellent performance of NiS2-Ni(OH)(2)/CNT even after 2000 cycles without obvious degradation, due to the formation of three-dimensional network of layered sulphide and one-dimensional CNTs that plays a main role in the energy conversion and storage. (C) 2019 Elsevier B.V. All rights reserved.
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