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Solar-charged Photoelectrochemical Wastewater Fuel Cell for Efficient and Sustainable Hydrogen Production

Abstract

It is of great practical significance to realize the efficient treatment of wastewater and the comprehensive utilization of chemical energy of wastewater. Thus, a WO3NFs-C/Cu2ONWAs visible-light response dual-photoelectrodes solar-charged photoelectrochemical wastewater fuel cell (scPEWFC) was constructed for efficient hydrogen production based on the promotion of phenol oxidation at the anode. The hydrogen production reaches as high as 93.08 μmol cm-2 by the photoelectrocatalytic oxidation of phenol (TOC removal rate reached 82.12%) of WO3NFs-C/Cu2ONWAs under visible light irradiation for 8 h without additional bias, which is 3.02 times higher than that of pure photocatalytic water splitting. The excellent photoelectrochemical performance can be attributed to the less endergonic process of phenol oxidation compared to water oxidation, which indicated that phenol oxidation can promote the hydrogen generation at the cathode. Isotopic labelling experiments show that protons were derived from the splitting of water rather than phenol. Interestingly, the effective combination of photochargeable properties of WO3 with PEC, the hydrogen production (4 h to produce 7.50 μmol cm-2) was still carried out at the cathode under the dark owing to the stored electrons of WO3 under the light, which realized the ideal effect of full-day and high-efficiency hydrogen production. Besides, the mechanism of scPEWFC operation was investigated in detail. This paper provides a new research idea for scPEWFC wastewater treatment, energy recover, electron storage, and simultaneous full-day hydrogen production.

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Publication details

The article was received on 14 Sep 2017, accepted on 13 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08112J
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Solar-charged Photoelectrochemical Wastewater Fuel Cell for Efficient and Sustainable Hydrogen Production

    Z. Zhou, Z. Wu, Q. Xu and G. Zhao, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08112J

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