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Microwave-assisted ultrafast synthesis of adjustable bimetal phosphide/graphene heterostructures from MOFs for efficient electrochemical water splitting

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Abstract

Herein, we develop a novel ultrafast microwave-assisted thermal conversion route to tune the heterostructure of transition metal phosphide/graphene composites for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activity enhancement. With this method, transition metal phosphide/graphene composites with adjustable heterostructures including transition metal phosphide/P-doped graphene and core@shell transition metal phosphide@graphitized carbon/P-doped graphene could be obtained by using metal organic framework (MOF)/graphene as a precursor within 20 s. In contrast, traditional programmed heat treatment only results in transition metal phosphide/non-doped graphene. We reveal for the first time that transition metal phosphides and their derived oxy/hydroxides, rather than the long thought graphitized carbon covering the surface of transition metal phosphides, are the most active sites for the HER and OER, respectively. Meanwhile, P-doping in graphene could highly improve its electrocatalytic performance while graphitized carbon encapsulation might impair its performance by separating it from the electrolyte. Therefore, bimetal phosphide (FeNiP)/P-doped graphene was determined as the most active metal phosphide/graphene heterostructure and it could deliver a very low overpotential of about 229 and 173 mV at 10 mA cm−2 in alkaline media for the OER and HER, respectively. Furthermore, a high-performance overall water splitting cell that could achieve a current density of 10 and 50 mA cm−2 at 1.58 and 1.74 V, respectively, was successfully constructed by using FeNiP/P-doped graphene as both cathode and anode.

Graphical abstract: Microwave-assisted ultrafast synthesis of adjustable bimetal phosphide/graphene heterostructures from MOFs for efficient electrochemical water splitting

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Publication details

The article was received on 24 Mar 2019, accepted on 04 Apr 2019 and first published on 04 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA03146D
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Microwave-assisted ultrafast synthesis of adjustable bimetal phosphide/graphene heterostructures from MOFs for efficient electrochemical water splitting

    F. Bu, W. Chen, M. F. Aly Aboud, I. Shakir, J. Gu and Y. Xu, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA03146D

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