Surface‐Modified ZnCo2O4 Nanoparticles as Binder‐Free Electrode for All Solid‐State Asymmetric Supercapacitor

Author:

Sekhar Tripathi Himadri1,Chatterjee Piyali2ORCID,Singha Achintya1,Chakraborty Amit K.23ORCID

Affiliation:

1. Bose Institute 93/1 APC road Kolkata 700009 West Bengal India

2. Carbon Nanotechnology Lab Department of Physics National Institute of Technology Durgapur Durgapur 713209 West Bengal India

3. Centre of Excellence in Advanced Materials National Institute of Technology Durgapur Durgapur 713209 West Bengal India

Abstract

AbstractChoice of electrode material is crucial to the development of high‐performance supercapacitors. Since surface properties are key to the performance of an electrode material for supercapacitors, surface chemical treatment of electrode materials is an interesting topic of research. ZnCo2O4 (ZCO) is a low‐cost binary transition metal oxide with high theoretical conductivity and charge storage capacity making it a good choice for supercapacitor electrode. Herein, we present a systematic investigation of the influence of four different surface modifier (3 surfactants, 1 mineralizer) on ZCO electrode directly grown on Ni foam to compare the relative influence on the performance of the modified ZCO electrode. Analyses of the modified ZCO electrodes revealed the formation of cubic spinel phase of ZCO with average particle size of ~30 nm. The sodium dodecyl sulfate (ZCO−S) modified electrode (ZCO−S) exhibited the best electrochemical performance with specific capacitance of 1988 F/g at 1 A/g and 87 % capacity retention after 7000 cycles at 10 A/g. Further, an all‐solid‐state asymmetric supercapacitor (ASC) was fabricated with ZCO−S on Ni foam and carbon nanotube combination which exhibited specific capacitance of 102 F/g at 1 A/g corresponding to power density of ~1599 W‐kg−1 establishing ZCO−S as a very good electrode material for supercapacitor.

Publisher

Wiley

Subject

General Chemistry

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