Citation: Guanghui SUI, Yanyan CHENG. Application of rice husk-based activated carbon-loaded MgO composite for symmetric supercapacitors[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(3): 521-530. doi: 10.11862/CJIC.20240221 shu

Application of rice husk-based activated carbon-loaded MgO composite for symmetric supercapacitors

Guanghui SUI ^, ,
Yanyan CHENG

Department of Chemistry and Food Science, Nanchang Normal University, Nanchang 330032, China

Corresponding author: Guanghui SUI, ghsui@ncnu.edu.cn
Received Date: 12 June 2024
Revised Date: 7 December 2024

Figures(8)

Amorphous activated carbon (AC) material was obtained by carbonizing rice husk at low temperatures and activated by KOH at high temperatures. A series of MgO-loaded AC materials (MgO/AC) were prepared by in-situ loading of magnesium chloride. The surface morphology and elemental composition of MgO/AC materials were studied using X-ray diffraction (XRD), laser co-polymerization Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy-energy dispersive spectrometer (SEM-EDS), and nitrogen adsorption-desorption test. The possible relationship between pore structure and electrochemical performance was analyzed in detail. The test results indicated that 2.0MgO/AC electrodes were assembled into a symmetric supercapacitor, and the gravimetric capacitance was 211.9 F·g^-1 at 0.5 A·g^-1. It had an energy density of 18.30 Wh·kg^-1 at a power density of 0.41 kW·kg^-1 and the retention rate was 86.8% after 5 000 cycles.
- MgO-loaded activated carbon,
- composite electrode,
- symmetric supercapacitor,
- energy density
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