Journal
JOURNAL OF ENERGY STORAGE
Volume 37, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2021.102477
Keywords
NiCo2S4; Wheat husk; Activated carbon; Supercapacitors; Biomass
Categories
Funding
- Indigenous Ph.D. fellowships program for 5000 scholars, HEC Pakistan (Phase-II Batch-V)
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The research showed that electrodes made from activated carbon from wheat husk and nickel-cobalt sulfide have high capacitance and excellent electrochemical performance in supercapacitors, attributed to the rapid diffusion pathways provided by WHAC and fast redox reaction of NiCo2S4.
Transforming carbon-containing biomass into valuable carbon materials is highly required. The approach reduces not only environmental pollution but also develops porous carbon electrodes for energy storage devices. Herein, a novel ex-situ synthesis of Nickel-Cobalt Sulfide/Wheat Husk Activated Carbon (NiCo2S4/WHAC) on Ni foam as an electrode material for supercapacitors was reported. The activated carbon was synthesized from the carbonization of the wheat husk, which was further activated using KOH. Afterward, the NiCo2S4/WHAC/Ni electrode was fabricated by the hydrothermal method. The capacitance of the NiCo2S4/WHAC/Ni electrode was 1962 F/g at a current density of 1 A/g. The improved electrochemical performance of NiCo2S4/WHAC electrode could be ascribed to rapid diffusion pathways delivered by WHAC and the fast redox reaction of NiCo2S4. Furthermore, the asymmetric supercapacitor device (NiCo2S4//WHAC) could operate at a potential window of 1.1 V and exhibited a capacitance of 252 F/g, which could provide specific energy of 42 Wh/kg at a specific power of 550 W/kg with 108% capacity retention.
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