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Improving electrochemical activity of activated carbon derived from popcorn by NiCo2S4 nanoparticle coating

We report a popcorn-derived activated carbon (PCs) from maize grains. Dispersed NiCo2S4 nanoparticles of dozens of nanometers in diameter are anchored onto the PC surface to yield PCs/NiCo2S4 composites. The adhesion of NiCo2S4 nanoparticles to the porous carbon substrate provides the PCs/NiCo2S4 composite electrode with an improved electrochemical performance. The highly electroconductive PCs substrate with porous structure and combination with dispersive NiCo2S4 nanoparticles, yields PCs/NiCo2S4 composites with a high specific capacitance of 605.2?F?g?1 at the current density of 0.5?A?g?1 in a voltage range of ?0.1 to 0.4?V in 6?M KOH electrolyte, and an outstanding capacitance conservation of 91.3% after 5000 galvanostatic charge/discharge cycling. Moreover, the asymmetric supercapacitor demonstrates high energy density of 23.3?W?h?kg?1 at the power density of 335.8?W?kg?1, and an excellent cycling stability of 92.7% capacitance retention after 5000 cycles. This research supplies a novel method to exploit biomass-based electrode material candidates for promising application on high-performance supercapacitors.

» Author: Miao Yu, Yingying Han, Yao Li, Jian Li, Lijuan Wang

» Reference: 10.1016/j.apsusc.2018.09.037

» Publication Date: 01/01/2019

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [609149].

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