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In-situ decorate Ni2P nanocrystals co-catalysts on g-C3N4 for efficient and stable photocatalytic hydrogen evolution via a facile co-heating method

Abstract

Very recently, transition metal phosphides (TMPs) have emerged as low-cost and robust co-catalysts to decorate graphitic carbon nitride (g-C3N4) for photocatalytic hydrogen (H2) evolution. However, to date, little work has been done regarding the decoration approaches to hybridize TMPs on g-C3N4 surface with homogeneous dispersion and intimate interfacial contact. Herein, we present aVery recently, transition metal phosphides (TMPs) have emerged as low-cost and robust co-catalysts to decorate graphitic carbon nitride (g-C3N4) for photocatalytic hydrogen (H2) evolution. However, to date, little work has been done regarding the decoration approaches to hybridize TMPs on g-C3N4 surface with homogeneous dispersion and intimate interfacial contact. Herein, we present a facile and convenient route to in-situ incorporate g-C3N4 nanosheets (NSs) and Ni2P nanocrystals (NCs) co-catalysts via a one-step co-heating solution approach. The Ni2P/g-C3N4 (in-situ) hybrid photocatalyst achieved far superior H2 production rate (2849.5 μmol g-1 h-1) and durability (no decrease after 4 cycles reaction within 20 h) compared to Ni2P/g-C3N4 (self-assembly) sample. The apparent quantum efficiency (AQY) of 18.8% at 420 nm was also much higher than other TMPs co-catalysts loaded g-C3N4 hybrid photocatalysts. A possible Ni(δ+)‒N(δ-) chemical coupling in Ni2P/g-C3N4 (in-situ) hybrid composite was proposed and corroborated by X-ray photoelectron spectroscopy (XPS) spectra and X-ray absorption spectroscopy. The unique Ni(δ+)‒N(δ-) chemical bonding states between g-C3N4 and Ni2P significantly accelerate the photo-generated charge-carrier separation and extraction from g-C3N4, as well as maintain the H2 production durability. We believe that the hybridization route presented in this work will be extended to construct other TMPs integrated photocatalysts toward efficient and stable solar water splitting.

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Publication details

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


Article type: Paper
DOI: 10.1039/C9TA08361H
J. Mater. Chem. A, 2019, Accepted Manuscript

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    In-situ decorate Ni2P nanocrystals co-catalysts on g-C3N4 for efficient and stable photocatalytic hydrogen evolution via a facile co-heating method

    P. Wen, K. Zhao, H. Li, J. Li, J. Li, Q. Ma, S. M. Geyer, L. Jiang and Y. Qiu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA08361H

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