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Asymmetric Supercapacitors Based on ZnCo2O4 Nanohexagons and Orange Peel Derived Porous Carbon Electrodes
Journal article   Open access   Peer reviewed

Asymmetric Supercapacitors Based on ZnCo2O4 Nanohexagons and Orange Peel Derived Porous Carbon Electrodes

M Haripriya, T Manimekala, Gnanaprakash Dharmalingam, Manickam Minakshi Sundaram and R Sivasubramanian
Chemistry, an Asian journal, Vol.19(13), e202400202
2024
DOI: https://doi.org/10.1002/asia.202400202
PMID: 38687089
Appears in  Open Access via Read & Publish Agreements
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Published (Version of Record)CC BY-NC V4.0,  Open Access

Abstract

Herein, the performance of asymmetric supercapacitors (ASC) fabricated using ZnCo2O4 (ZCO) nano-hexagons and orange peel-derived activated carbon (OPAC) as electrodes was studied. ZCO was prepared by a double hydroxide method and OPAC was prepared from orange peel followed by KOH activation. For ZCO, the calcination temperature was determined using TGA analysis. The XRD showed the presence of a cubic spinel structure. The chemical structure was analyzed using XPS, FTIR, and Raman spectroscopy respectively. For OPAC, the presence of an amorphous nature was inferred; FTIR and Raman studies indicate the presence of functional groups and defect structure in the material. The presence of ZCO nano-hexagons was observed from SEM and TEM respectively. For OPAC, an interconnected pore structure was observed from the SEM image. The specific capacitance for ZCO and OPAC was found to be 194 F.g-1 and 159 F.g-1 at a current density of 0.25 A.g-1. Further, an ASC was fabricated using ZCO as a positive and OPAC as a negative electrode in 2M KOH-soaked separator. A cell voltage of 1.2 V was achieved and the specific capacitance was calculated to be 64 F.g-1 at 0.25 A.g-1. Further, the cyclic stability and the changes at the electrode/electrolyte interface were studied.

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