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Issue 35, 2018
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Noble-metal-free Ni3N/g-C3N4 photocatalysts with enhanced hydrogen production under visible light irradiation

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Abstract

The majority of visible-light photocatalysts show very low hydrogen evolution activity in the absence of noble metal co-catalysts due to their fast carrier recombination rate. Metallic interstitial nitrides have been recognized as excellent hydrogen evolution electrocatalysts and therefore are promising alternative co-catalysts for photocatalytic hydrogen production. Herein we report a low-cost, efficient, noble-metal-free visible-light-driven hydrogen evolution photocatalyst composed of Ni3N/g-C3N4 heterostructures. The as-prepared photocatalyst with a Ni3N loading content of 3 wt% shows a high hydrogen evolution rate of 169 μmol g−1 h−1, which is slightly higher than that of 3 wt% Pt modified g-C3N4 (152.0 μmol g−1 h−1). The Ni3N/g-C3N4 photocatalysts also exhibit remarkable photostability for four consecutive cycles of photocatalytic activity tests with a total reaction time of 12 hours. The excellent performance of the Ni3N/g-C3N4 photocatalyst is ascribed to the formation of an optimal number of Ni3N/g-C3N4 heterojunctions that improve photogenerated carrier separation and offer abundant photocatalytically active sites for surface reactions.

Graphical abstract: Noble-metal-free Ni3N/g-C3N4 photocatalysts with enhanced hydrogen production under visible light irradiation

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Publication details

The article was received on 15 Jun 2018, accepted on 07 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8DT02456A
Citation: Dalton Trans., 2018,47, 12188-12196
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    Noble-metal-free Ni3N/g-C3N4 photocatalysts with enhanced hydrogen production under visible light irradiation

    L. Chen, H. Huang, Y. Zheng, W. Sun, Y. Zhao, P. S. Francis and X. Wang, Dalton Trans., 2018, 47, 12188
    DOI: 10.1039/C8DT02456A

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