Synergistic interaction between redox-active electrolyte and binder-free functionalized carbon for ultrahigh supercapacitor performance

Li-Qiang Mai (), Aamir Minhas-Khan, Xiaocong Tian, Kalele Mulonda Hercule, Yun-Long Zhao, Xu Lin and Xu Xu
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Li-Qiang Mai: State Key Laboratory of Advanced Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Aamir Minhas-Khan: State Key Laboratory of Advanced Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Xiaocong Tian: State Key Laboratory of Advanced Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Kalele Mulonda Hercule: State Key Laboratory of Advanced Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Yun-Long Zhao: State Key Laboratory of Advanced Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Xu Lin: State Key Laboratory of Advanced Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology
Xu Xu: State Key Laboratory of Advanced Materials Synthesis and Processing, WUT-Harvard Joint Nano Key Laboratory, Wuhan University of Technology

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Development of supercapacitors with high-energy density and high-power density is a tremendous challenge. Although the use of conductive carbon materials is promising, other methods are needed to reach high cyclability, which cannot be achieved by fully utilizing the surface-oxygen redox reactions of carbon. Here we introduce an effective strategy that utilizes Cu2+ reduction with carbon-oxygen surface groups of the binder-free electrode in a new redox-active electrolyte. We report a 10-fold increase in the voltammetric capacitance (4,700 F g−1) compared with conventional electrolyte. We measured galvanostatic capacitances of 1,335 F g−1 with a retention of 99.4% after 5,000 cycles at 60 A g−1 in a three-electrode cell and 1,010 F g−1 in a two-electrode cell. This improvement is attributed to the synergistic effects between surface-oxygen molecules and electrolyte ions as well as the low charge transfer resistance (0.04 Ω) of the binder-free porous electrode. Our strategy provides a versatile method for designing new energy storage devices and is promising for the development of high-performance supercapacitors for large-scale applications.

Date: 2013
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DOI: 10.1038/ncomms3923

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