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Reusable CoxNi1−x dye adsorbents as supercapacitor electrode materials

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Abstract

Herein, a novel method was developed to synthesize a CoNi binary metal/Co–Ni oxide@carbon (M/MO@C-600) composite by sintering CoNi nanoparticles with Congo Red (CR) at 600 °C and under a N2 atmosphere; this composite was then utilized to prepare electrode materials. Herein, C and O originated from the CR molecule. The M/MO@C-600 composite with a flaky structure delivered a capacitance of 1134.9 F g−1 at 1 A g−1 and a cycling stability with 66% retention even at the high current density of 10 A g−1 after 2000 cycles. Furthermore, a simple asymmetric supercapacitor (ASC) was developed with the M/MO@C-600 composite as the positive electrode material and commercial activated carbon as the negative electrode material. A high specific capacitance of 111.2 F g−1 (at 0.5 A g−1) and excellent energy density of 44.6 W h kg−1 (at 0.425 kW kg−1) were obtained for the ASC device, and 100% capacitance was retained even after 10 000 cycles at 6 A g−1. This method for the preparation of electrode materials may facilitate to simultaneously relieve the environmental and energy pressure.

Graphical abstract: Reusable CoxNi1−x dye adsorbents as supercapacitor electrode materials

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Publication details

The article was received on 18 Jan 2017, accepted on 30 Mar 2017 and first published on 30 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA00578D
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Reusable CoxNi1−x dye adsorbents as supercapacitor electrode materials

    H. Sun, X. Yang, L. Zhang, L. Zhao and J. Lian, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA00578D

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