NDLI: Electrochemical composite deposition of porous cactus-like manganese oxide/reduced graphene oxide–carbon nanotube hybrids for high-power asymmetric supercapacitors

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Back cover

Journal of Materials Chemistry C Vol - 3 Issue - 9

Journal of Materials Chemistry C Vol - 3 Issue - 8

Journal of Materials Chemistry C Vol - 3 Issue - 7

Journal of Materials Chemistry C Vol - 3 Issue - 6

Journal of Materials Chemistry C Vol - 3 Issue - 5

Journal of Materials Chemistry C Vol -2

Journal of Materials Chemistry C Vol -1

Electrochemical composite deposition of porous cactus-like manganese oxide/reduced graphene oxide–carbon nanotube hybrids for high-power asymmetric supercapacitors

Content Provider	Royal Society of Chemistry (RSC)
Author	Yang, Shin-Yi Liao, Wei-Hao Wang, Yu-Sheng Hu, Chi-Chang Hsiao, Sheng-Tsung Li, Shin-Ming Ma, Chen-Chi M.
Copyright Year	2015
Abstract	This paper proposes a simple, one-step, two-electrode electrochemical composite deposition for fabricating amorphous manganese oxide/graphene–carbon nanotube (a-MnOx/rGO–CNT) hybrids. The a-MnOx/rGO–CNT hybrids were simultaneously deposited onto steel substrates by using dodecylbenzene-sulfonic acid and controlling the cell voltage. The cell voltage affected the deposition rates of manganese oxide (driven by the concentration gradient) and carbon materials (driven by the potential gradient). The mass ratio of a-MnOx to rGO–CNT, controlled by the cell voltage, affected the morphology, microstructure, and capacitive behavior of a-MnOx/rGO–CNT. Under the optimal cell voltage (=1.25 V), an a-MnOx/rGO–CNT electrode exhibited a cactus-like a-MnOx nanostructure, an even dispersion of a-MnOx within the rGO–CNT, and a highly porous structure, yielding the highest outer charge (296.5 C g−1 cm−2) among all a-MnOx/rGO–CNT electrodes. In addition, a-MnOx/rG-CNT1.25V exhibited a high specific capacitance (440 F g−1 at 5 mV s−1) and excellent capacitance retention (60% at 1000 mV s−1). An asymmetric supercapacitor consisting of a commercial activated carbon negative electrode and an a-MnOx/rGO–CNT1.25V positive electrode provided a high specific energy (SE) of 18 W h kg−1 at a specific power (SP) of 1 kW kg−1. The SE of this asymmetric supercapacitor reached 5.1 W h kg−1 at a very high SP of 32 kW kg−1.
Starting Page	4987
Ending Page	4996
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	3
Issue Number	19
Journal	Journal of Materials Chemistry C
DOI	10.1039/c5tc00157a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	CNT Electrochemistry Manganese oxide Acid The Cell Carbon Electrode Nanostructure Dispersion relation Capacitance Supercapacitor Activated carbon Energy density Power density
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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