Hybrid Mesoporous Carbon/Copper Ferrite Electrode for Asymmetric Supercapacitors

Huynh, Khang; Maddipudi, Bharathkiran; Shende, Rajesh

doi:10.3390/nano13162365

Hybrid Mesoporous Carbon/Copper Ferrite Electrode for Asymmetric Supercapacitors

Journal Article · Fri Aug 18 00:00:00 EDT 2023 · Nanomaterials

DOI:https://doi.org/10.3390/nano13162365· OSTI ID:2418605

Huynh, Khang ^[1]; Maddipudi, Bharathkiran ^[2]; ^[2]

South Dakota School of Mines and Technology, Rapid City, SD (United States); South Dakota School of Mines and Technology, Rapid City, SD (United States)
South Dakota School of Mines and Technology, Rapid City, SD (United States)

Asymmetric supercapacitors (ASCs) with two dissimilar electrodes are known to exhibit relatively moderate energy and power densities. If electrodes derived from earth-abundant materials or renewable resources such as lignocellulosic biomass (LCB) are used for fabrication, energy storage systems are expected to become less expensive and more sustainable. Hybrid electrode materials have advantages such as higher surface area, better chemical stability, and superior energy density. This study reports on the synthesis of a novel hybrid electrode material containing porous carbon (POC) and copper ferrite, which is designated as POC@Cu-ferrite, and its electrochemical performance in ASC configuration. Corn stover derived hydrochar is utilized for the sol–gel synthesis of POC@Cu-ferrite hybrid material using earth-abundant Cu and Fe-based precursors. This material is characterized using X-ray diffraction (XRD), Raman spectroscopy, Brunauer–Emmett–Teller (BET) surface area analyzer, and scanning and transmission electron microscopy (SEM/TEM). As-synthesized Cu-ferrite is found to contain 89.2% CuFe₂O₄ and 10.8% Fe₂O₃, whereas other phases such as Fe₃O₄, CuFeO₂, and CuO are observed for the POC@Cu-ferrite. BET-specific surface area (SSA) and pore volume of POC@Cu-ferrite are observed as 1068 m²/g and 0.72 cm³/g, respectively. POC@Cu-ferrite hybrid electrode is used with POC opposite electrode to fabricate ASC, which is tested using Gamry G-300 potentiostat/galvanostat/ZRA to obtain cyclic voltammetry (CV) profiles and galvanostatic charge–discharge (GCD) plots. ASC is also prepared using Cu-ferrite and POC materials and its specific capacitance and stability are compared with ASCs prepared with POC@Cu-ferrite and POC or graphene nanoplatelets (GNPs) electrodes. POC@Cu-ferrite hybrid electrode is found to be superior with a 2-fold higher capacitance and significant electrochemical stability over 100 GCD cycles as compared to the Cu-ferrite electrode.

View Accepted Manuscript (DOE)

Research Organization:: South Dakota School of Mines and Technology, Rapid City, SD (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0008252

OSTI ID:: 2418605

Journal Information:: Nanomaterials, Journal Name: Nanomaterials Journal Issue: 16 Vol. 13; ISSN 2079-4991

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
CV
Cu-ferrite
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asymmetric supercapacitor
electrochemical impedance spectroscopy
mesoporous carbon

Hybrid Mesoporous Carbon/Copper Ferrite Electrode for Asymmetric Supercapacitors

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