Issue 46, 2021

Hollow CoP spheres assembled from porous nanosheets as high-rate and ultra-stable electrodes for advanced supercapacitors

Abstract

The electrode materials with a high rate capability and excellent recycling ability are vitally critical for building the supercapacitors, but their synthesis remains a challenge. Herein, we have constructed hollow CoP spheres assembled from 2D porous nanosheet units (HCPS) through the controllable phosphatizing of the pre-designed Co-ethylene glycol (Co-EG) precursor. HCPS have several combined advantages benefiting as the electrode of the supercapacitors, including plentiful accessible ion/electron sites of porous nanosheets, good ability to buffer the volume variation of a hollow structure and enhanced mass/charge transfer due to the high conductivity of the phosphide. The tests show that the optimal HCPS electrode manifests good specific capacitance of 723 F g−1 at 1 A g−1, excellent rate property of 71.21% retention at 30 A g−1. Excitingly, HCPS exhibit super-long cycle stability with 94.3% retention exceeding 50 000 cycles, which can well rival carbon-based electrodes and stands at the forefront of the reported phosphide and oxide-based electrodes. Moreover, an asymmetric supercapacitor (ASC) device equipped with HCPS-positive electrode and negative B, N-doped graphitic carbon (BNGC) electrode presents a high energy density of 38.72 W h kg−1 at a higher power density of 8000 W kg−1 and remarkable stability (96.2% retention after 20 000 cycles), which certifies the promising potential of HCPS for high-efficiency energy storage.

Graphical abstract: Hollow CoP spheres assembled from porous nanosheets as high-rate and ultra-stable electrodes for advanced supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
03 Sep 2021
Accepted
01 Nov 2021
First published
01 Nov 2021

J. Mater. Chem. A, 2021,9, 26226-26235

Hollow CoP spheres assembled from porous nanosheets as high-rate and ultra-stable electrodes for advanced supercapacitors

L. Sun, Z. Xie, A. Wu, C. Tian, D. Wang, Y. Gu, Y. Gao and H. Fu, J. Mater. Chem. A, 2021, 9, 26226 DOI: 10.1039/D1TA07566G

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