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p–n tungsten oxide homojunctions for Vis-NIR light-enhanced electrocatalytic hydrogen evolution

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Abstract

Based on energy band engineering theory, a p–n homojunction of metal oxides was designed to overcome the recombination of photogenerated carriers and inappropriate hydrogen adsorption energy. A novel p–n tungsten oxide homojunction was successfully synthesized by tuning oxygen vacancies and phosphorus-doping. Based on the synergies of Mxenes, a Vis-NIR light-enhanced electrocatalytic hydrogen evolution system was accomplished with a small overpotential of 44 mV (at 10 mA cm−2) and a low Tafel slope of 41 mV dec−1, which performed much more efficiently than in darkness and comparably to noble-metal catalysts (Pt and Pt/C). Moreover, the as-synthesized samples offered a distinct advantage of long-term stability for more than 24 h both with and without light irradiation. The design philosophy of p–n homojunctions opens a prospect of utilizing light-activated metal oxides to integrate catalysis with solar energy and electrical energy.

Graphical abstract: p–n tungsten oxide homojunctions for Vis-NIR light-enhanced electrocatalytic hydrogen evolution

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Publication details

The article was received on 19 Jun 2019, accepted on 30 Jul 2019 and first published on 31 Jul 2019


Article type: Paper
DOI: 10.1039/C9TA06589J
J. Mater. Chem. A, 2019, Advance Article

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    p–n tungsten oxide homojunctions for Vis-NIR light-enhanced electrocatalytic hydrogen evolution

    B. Chang, Z. Ai, D. Shi, Y. Zhong, K. Zhang, Y. Shao, L. Zhang, J. Shen, Y. Wu and X. Hao, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA06589J

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