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

Talam Enock Kibona , Godlisten Shao, Hee Kim, Cecil K. King'ondu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Here, we report synthesis of biogas slurry mesoporous carbon/MnO composites 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 while total pore volume decreased from 0.52 to 0.17 cm g for samples loaded with 2x10-5 and 2x10-3 moles 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.
Original languageEnglish
Pages (from-to)21-33
JournalNano-Structures and Nano-Objects
Volume17
DOIs
Publication statusPublished - 2019

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Biofuels
Biogas
electrochemical capacitors
Capacitance
Carbon
textures
Textures
capacitance
Electrodes
composite materials
electrodes
carbon
Composite materials
Crystal microstructure
Coprecipitation
sorption
Isotherms
Raman spectroscopy
Sorption
isotherms

Cite this

@article{b96ecd0878844262bf573e915f246f9b,
title = "Specific capacitance–pore texture relationship of biogas slurry mesoporous carbon/MnO2 composite electrodes for supercapacitors",
abstract = "Here, we report synthesis of biogas slurry mesoporous carbon/MnO composites 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 while total pore volume decreased from 0.52 to 0.17 cm g for samples loaded with 2x10-5 and 2x10-3 moles 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.",
author = "Kibona, {Talam Enock} and Godlisten Shao and Hee Kim and King'ondu, {Cecil K.}",
year = "2019",
doi = "10.1016/j.nanoso.2018.10.002",
language = "English",
volume = "17",
pages = "21--33",
journal = "Nano-Structures and Nano-Objects",
issn = "2352-507X",
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}

Specific capacitance–pore texture relationship of biogas slurry mesoporous carbon/MnO2 composite electrodes for supercapacitors. / Kibona , Talam Enock; Shao, Godlisten ; Kim, Hee; King'ondu, Cecil K.

In: Nano-Structures and Nano-Objects, Vol. 17, 2019, p. 21-33.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Specific capacitance–pore texture relationship of biogas slurry mesoporous carbon/MnO2 composite electrodes for supercapacitors

AU - Kibona , Talam Enock

AU - Shao, Godlisten

AU - Kim, Hee

AU - King'ondu, Cecil K.

PY - 2019

Y1 - 2019

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AB - Here, we report synthesis of biogas slurry mesoporous carbon/MnO composites 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 while total pore volume decreased from 0.52 to 0.17 cm g for samples loaded with 2x10-5 and 2x10-3 moles 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.

U2 - 10.1016/j.nanoso.2018.10.002

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JF - Nano-Structures and Nano-Objects

SN - 2352-507X

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