Issue 36, 2017

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

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

Supplementary files

Article information

Article type
Paper
Submitted
31 May 2017
Accepted
13 Aug 2017
First published
14 Aug 2017

J. Mater. Chem. A, 2017,5, 19054-19061

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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