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
N2 - 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.
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
DO - 10.1016/j.nanoso.2018.10.002
M3 - Article
SN - 2352-507X
VL - 17
SP - 21
EP - 33
JO - Nano-Structures and Nano-Objects
JF - Nano-Structures and Nano-Objects
ER -