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Issue 36, 2017
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Carbon-incorporated Janus-type Ni2P/Ni hollow spheres for high performance hybrid supercapacitors

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Abstract

Transition metal phosphides, especially Ni2P, are of great interest as promising battery-type electrode materials for hybrid supercapacitors, but their poor electrical conductivity and porosity limit their application. Here, for the first time, the synthesis of carbon-incorporated Janus-type Ni2P/Ni hollow spheres (Ni2P/Ni/C) was reported via simultaneous carbonization and phosphorization of Ni-based metal–organic frameworks (Ni-MOFs). Their unique structural merits include the incorporated carbon content, Janus-type Ni2P/Ni nanocrystals, and high-porosity hollow structure, thus endowing them with a high specific surface area, good electrical conductivity and low density. As a result, the optimized Ni2P/Ni/C exhibits a remarkable specific capacitance of 1449 F g−1 at 1 A g−1 in 2 M KOH aqueous electrolyte in a three-electrode system. A hybrid supercapacitor device was fabricated by using Ni2P/Ni/C as the positive electrode and active carbon as the negative electrode, and it achieves a very high energy density of 32.02 W h kg−1 at a power density of 700 W kg−1 and a remarkable cycling stability (about 99% capacitance retention after 5000 cycles). The Ni2P/Ni/C should be one of the most promising electrode materials for hybrid supercapacitor application.

Graphical abstract: Carbon-incorporated Janus-type Ni2P/Ni hollow spheres for high performance hybrid supercapacitors

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Publication details

The article was received on 31 May 2017, accepted on 13 Aug 2017 and first published on 14 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA04720G
Citation: J. Mater. Chem. A, 2017,5, 19054-19061
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    Carbon-incorporated Janus-type Ni2P/Ni hollow spheres for high performance hybrid supercapacitors

    S. Hou, X. Xu, M. Wang, Y. Xu, T. Lu, Y. Yao and L. Pan, J. Mater. Chem. A, 2017, 5, 19054
    DOI: 10.1039/C7TA04720G

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