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Optimizing the rate capability of Nickel Cobalt Phosphide nanowires into graphene oxide by the outer/inter-components synergy effect

Abstract

The bimetallic phosphides have been identified as promising alternative electrode materials owing to the admirable conductivity and electrochemical activity. Nevertheless, severe agglomeration of single-component bimetallic phosphides hinders its extensive application. Moreover, the current research lack of in-depth research for the effect of outer/inter-components synergy on the rate capability. In this work, novel nickel cobalt phosphide nanowires into two-dimensional graphene oxide nanosheets (GO@NiCoP) is design and prepared by combining the hydrothermal process and phosphorization. The GO serves as the conductive path to improve the composite conductivity, and provides the abundant oxygen-containing function group to coordinate with the metal cations of NiCoP, thereby can boost the overall structural stability. The NiCoP possess optimal intercomponent synergy effect such as optimal -OH- adsorption energy and deprotonation energy, leading to the enhanced potential on electrochemical reaction. Taking advantages of these materials, the GO@NiCoP electrode displays a high specific capacitance of 1125 F g-1 (155 mAh g-1) at 2 A g-1 and a high cycling stability of 104.88% capacitance retention after 5000 cycles at 30 A g-1. Interestingly, the GO@NiCoP electrode delivers an exceptional rate capability of 84.09% capacitance retention at 20 A g-1 and 39.77% capacitance retention at 60 A g-1 owing to its stable structure and excellent conductivity. In addition, we fabricated GO@NiCoP//AG ASC device which delivers a desirable energy density of 27.71 Wh kg-1 at 788 W kg-1. To widen the application, a self-charging power system with satisfactory lighting time was constructed by the ASC device. In short, the outstanding electrochemical performance of the electrode materials provides a novel perspective for enhancing the rate capacity of electrode materials by the outer/inter-components synergy effect.

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Publication details

The article was received on 06 Nov 2019, accepted on 01 Dec 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9TA12192G
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Optimizing the rate capability of Nickel Cobalt Phosphide nanowires into graphene oxide by the outer/inter-components synergy effect

    C. Jing, X. Song, K. Li, Y. Zhang, X. Y. Liu, B. Dong, F. Dong, S. Zhao, H. Yao and Y. Zhang, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA12192G

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