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In situ fabrication of a rose-shaped Co2P2O7/C nanohybrid via a coordination polymer template for supercapacitor application

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Abstract

Herein, we report the construction of a rose-shaped cobalt phenylphosphonate coordination polymer [Co(PhPO3)] via the solvothermal method, which has been used as a precursor to prepare porous Co2P2O7/C nanohybrid through a thermal transformation process in N2. By controlling the calcination temperature, a series of polyporous rose-shaped Co2P2O7/C-X (X = 600, 700, 800, 900 and 1000) have been successfully obtained. The prepared Co2P2O7/C-X materials present in situ hybrid nanostructures and a unique polyporous structure, which will provide rich electrochemical active centers and enough migration paths for electrons and electrolyte for fast and deep faradaic reactions. As a supercapacitor electrode, the optimized Co2P2O7/C-900 demonstrated a specific capacitance of 349.6 F g−1 at 1 A g−1 and remarkable cycling performances (97.33% retention after 3000 cycles at 2 A g−1). Moreover, using the porous rose-shaped Co2P2O7/C-900 as a cathode with 3D porous graphene gel (3DPG) as an anode, an asymmetric supercapacitor Co2P2O7/C-900//3DPG was fabricated. The device showed an energy density of 21.9 W h kg−1 at a power density of 0.375 kW kg−1 and outstanding cycle stability of maintaining 106.25% initial capacity after 10 000 cycles at 3 A g−1.

Graphical abstract: In situ fabrication of a rose-shaped Co2P2O7/C nanohybrid via a coordination polymer template for supercapacitor application

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Article information


Submitted
12 May 2020
Accepted
22 Jun 2020
First published
24 Jun 2020

New J. Chem., 2020, Advance Article
Article type
Paper

In situ fabrication of a rose-shaped Co2P2O7/C nanohybrid via a coordination polymer template for supercapacitor application

J. Zhang, P. Liu, R. Bu, H. Zhang, Q. Zhang, K. Liu, Y. Liu, Z. Xiao and L. Wang, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ02414G

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