COMPARISON OF METAL OXIDE-CARBON COMPOSITES DERIVED FROM NATURAL ALGINATE GELS

Xiao-Feng Tang, Zhen-Guo Yang and Jia-Hui Liang
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Xiao-Feng Tang: Department of Materials Science, Fudan University, Shanghai 200433, P. R. China
Zhen-Guo Yang: Department of Materials Science, Fudan University, Shanghai 200433, P. R. China
Jia-Hui Liang: #x2020;College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China

Surface Review and Letters (SRL), 2019, vol. 26, issue 03, 1-9

Abstract: Metal oxide-carbon composites (MOCCs) derived from sodium alginate gels were prepared through a facile and green ionic gelation method. Various polyvalent cations (Mn2+, Fe3+, and Zn2+) were used to crosslink sodium alginate to produce gels, following which the gels were carbonized under nitrogen flow to yield MOCCs. X-ray diffraction, scanning electron microscopy, and Raman spectra can character the as-prepared materials’ structural and morphological characters and thermogravimetric analysis. The electrochemical behavior of the as-prepared materials was studied by applying to cyclic voltammetry, galvanostatic charge–discharge measurements, and electrochemical impedance spectroscopy in 6M KOH electrolyte. The highest specific capacitance (161F g−1 at 0.5A g−1) was obtained for the Fe oxide-doped carbon material (MOCC-Fe), which displayed a good life cycle with only a 10% capacitance decline after 2000 cycles.

Keywords: Metal oxide; carbon materials; alginate gel; supercapacitor (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18501615

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