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Heterojunction ZnWO4/ZnFe2O4 composites with concerted effects and integrated properties for enhanced photocatalytic hydrogen evolution

Abstract

Hydrogen fuel generated by solar water splitting has been recognized as a promising green energy technique. In this work, a novel ZnWO4/ZnFe2O4 heterojunction composite has been successfully prepared by a facile coprecipitation method for photocatalytic hydrogen evolution without using noble metal cocatalysts. The as prepared composites are well characterized by PXRD, UV-vis-DRS, TEM and XPS to ascertain the successful deposition of ZnFe2O4 nanoparticles onto ZnWO4 flakes. In the photocatalytic hydrogen evolution experiments using Na2S and Na2SO3 as hole scavengers, ZnWO4/ZnFe2O4 (30 wt%) exhibits the best activity compared to pure ZnWO4 and ZnFe2O4. The underlying reasons for superior photocatalytic hydrogen evolution of the optimal composite have been assessed based on the inextricably linked factors of light absorption, mobility and separation of charge carriers and redox potentials using photoluminescence, time resolved fluorescence life time and electrochemical impedance spectroscopy measurements. The photochemical durability of ZnWO4/ZnFe2O4 heterojunction composite signifies its suitability for practical applications.

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Publication details

The article was received on 07 Nov 2017, accepted on 08 Jan 2018 and first published on 09 Jan 2018


Article type: Paper
DOI: 10.1039/C7CY02281F
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Heterojunction ZnWO4/ZnFe2O4 composites with concerted effects and integrated properties for enhanced photocatalytic hydrogen evolution

    N. K. Veldurthi, N. K. Eswar, S. A. Singh and G. Madras, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C7CY02281F

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