TY - JOUR
T1 - Mini-chunk biochar supercapacitors
AU - Zhang, Lei
AU - Jiang, Junhua
AU - Holm, Nancy
AU - Chen, Fangling
N1 - Funding Information:
Acknowledgments We gratefully acknowledge the financial support from Illinois Hazardous Waste Research Fund, and the Hetero-FoaM Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award #DESC0001061.
Publisher Copyright:
© 2014, Springer Science+Business Media Dordrecht.
PY - 2014/10
Y1 - 2014/10
N2 - Biochar prepared from the pyrolysis of maple wood was studied as supercapacitor electrode materials. Three kinds of electrodes were fabricated: mini-chunk electrodes, thin-film electrodes, and large-disk-chunk electrodes. Their capacitive behaviors were studied using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The mini-chunk supercapacitor shows an electrochemical behavior similar to the supercapacitor using the thin-film electrodes. It exhibits outstanding performance characteristic of a high specific capacitance of approximately 32 F g−1 and a high stability without obvious capacitance decays upon 2,600 potential cycles. This indicates that the mini-chunk supercapacitor can be used as an mF-scale power source for electronic device applications. Moreover, the mini-chunk electrode provides a simple and fast technique to evaluate biochar materials used as potentially high-performance, low-cost, and environmental friendly supercapacitor electrodes without the need of binder and complicated fabrication procedures. However, the supercapacitor using large-disk-chunk biochar electrodes shows lower specific capacitive performance due to the high ohmic resistance stemming from long tubular structures within biochar.
AB - Biochar prepared from the pyrolysis of maple wood was studied as supercapacitor electrode materials. Three kinds of electrodes were fabricated: mini-chunk electrodes, thin-film electrodes, and large-disk-chunk electrodes. Their capacitive behaviors were studied using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The mini-chunk supercapacitor shows an electrochemical behavior similar to the supercapacitor using the thin-film electrodes. It exhibits outstanding performance characteristic of a high specific capacitance of approximately 32 F g−1 and a high stability without obvious capacitance decays upon 2,600 potential cycles. This indicates that the mini-chunk supercapacitor can be used as an mF-scale power source for electronic device applications. Moreover, the mini-chunk electrode provides a simple and fast technique to evaluate biochar materials used as potentially high-performance, low-cost, and environmental friendly supercapacitor electrodes without the need of binder and complicated fabrication procedures. However, the supercapacitor using large-disk-chunk biochar electrodes shows lower specific capacitive performance due to the high ohmic resistance stemming from long tubular structures within biochar.
KW - Biochar
KW - Maple wood
KW - Mini-chunk electrode
KW - Supercapacitor
KW - Thin-film electrode
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U2 - 10.1007/s10800-014-0726-7
DO - 10.1007/s10800-014-0726-7
M3 - Article
AN - SCOPUS:84919878331
VL - 44
SP - 1145
EP - 1151
JO - Journal of Applied Electrochemistry
JF - Journal of Applied Electrochemistry
SN - 0021-891X
IS - 10
ER -