Specific capacitance–pore texture relationship of biogas slurry mesoporous carbon/MnO2 composite electrodes for supercapacitors

Journal article

Authors / Editors

King'ondu, Cecil

Research Areas

ENGINEERING AND TECHNOLOGY (Frascati classification)

Publication Details

Subtitle: Specific capacitance–pore texture relationship of biogas slurry mesoporous carbon/MnO2 composite electrodes for supercapacitors

Author list: King'ondu, Cecil

Publisher: Royal Society of Chemistry

Publication year: 2019

Journal: Chemical Communications (1359-7345)

Volume number: 17

Issue number: 1

Start page: 21

End page: 33

Number of pages: 13

ISSN: 1359-7345

eISSN: 1364-548X

URL: https://doi.org/10.1016/j.nanoso.2018.10.002

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Abstract

Here, we report synthesis of biogas slurry mesoporous carbon/MnO2composites by simple co-precipitation route followed by thermal treatment at 250 °C for 6 h. The texture, morphology, crystal structure, and microstructure of the composites are investigated by nitrogen sorption studies, FESEM, HRTEM, X-ray diffraction, and Raman spectroscopy. All samples exhibit type IV isotherms. The BET surface area decreased from 514 to 110 m2 g−1 while total pore volume decreased from 0.52 to 0.17 cm3 g−1 for samples loaded with 2×10−5 and 2×10−3moles of Mn. The electrodes fabricated exhibit high specific capacitance of 709 F g−1 at scan rate of 5 mV s−1. The specific capacitance at scan rate of 5 mV s−1 increases with increasing MnO2 content. However, at 50 mV s−1, specific capacitance decreases with increasing MnO2 content. Varying the MnO2 content and hence the textural parameters, strongly influences the specific capacitances of the composite electrodes.

Keywords

Biogas slurryMesoporous carbonManganese oxideSupercapacitorsSpecific capacitance and composites

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