High-Performance Hybrid Supercapacitor with Passionfruit-Derived Cathode and Anode
SSRN Electronic Journal(2022)
Abstract
Although extensive efforts have been made to utilize raw biomass to synthesize porous carbon for supercapacitor (SC), it is difficult to achieve large-scale applications due to their slow diffusion kinetics and insufficient storage sites. Herein, biomass-derived high-capacity/high-rate cathode and anode materials are designed to realize high-performance SC. Ni3S2 nanoparticles encapsulated in S-doped passionfruit peel-derived porous carbon (S-PFPC) is developed as cathode material by providing sufficient space to store discharge products, S-PFPC porous channels for fast electron transport, and uniformly dispersed Ni3S2 nanoparticles for high charge storage capacity. Simultaneously, hierarchically porous carbon with a high specific surface area as anode material is also obtained by simple pyrolysis of passionfruit peel. Benefiting from the well match of anode and cathode structures, the assembled Ni3S2@S-PFPC//PFPC hybrid supercapacitor (HSC) exhibits a high energy density of 118 W h kg-1 at a power density of 433 W kg-1, and it remains as high as 75 W h kg-1 even at 8710 W kg-1. More importantly, the HSC displays long-life stability with an excellent capacitance retention of 88.3% over 10000 cycles. The route for preparing biomass-derived electrode materials proposed in this work broadens a new horizon to realize high-performance SC applications.
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Key words
supercapacitor,cathode,high-performance,passionfruit-derived
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