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Controllable fabrication of α-Ag2WO4 nanorod-clusters with superior simulated sunlight photocatalytic performance

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Abstract

α-Ag2WO4 clusters comprising an assembly of nanorods were controllably fabricated via a simple ion exchange method at room temperature. The phase, morphology, microstructure, optical absorption, photoluminescence, photoelectrochemical properties and photocatalytic behavior of the products were systematically explored. α-Ag2WO4 nanorod-clusters of high purity are achieved at a medium pH of 9.8 provided by adjusting the molar ratio of AgNO3 and Na2WO4 to 1 : 4, and the sample exhibits superior photocatalytic activity for the degradation of organic pollutants. Its rate constant k is as high as 21.8 fold in comparison with that of the sample obtained with stoichiometric raw materials at a ratio of 1 : 0.5. The boosted photoactivity of α-Ag2WO4 clusters can be well accounted for by the broadened light harvesting and accelerated charge separation, which are proved by the red-shifted light absorption, higher photocurrent and a smaller Nyquist impedance radius. Based on the detected active species and the band edge positions, a possible migration mechanism of photoinduced e/h+ pairs on the surface of α-Ag2WO4 clusters was proposed. This work provides some new insights into the rational design and synthesis of photocatalysts with a deep understanding of the relationship among the experimental parameters, the microstructure and properties to acquire a more desired photoactivity.

Graphical abstract: Controllable fabrication of α-Ag2WO4 nanorod-clusters with superior simulated sunlight photocatalytic performance

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Publication details

The article was received on 25 Sep 2018, accepted on 19 Nov 2018 and first published on 19 Nov 2018


Article type: Research Article
DOI: 10.1039/C8QI01025K
Citation: Inorg. Chem. Front., 2019, Advance Article
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    Controllable fabrication of α-Ag2WO4 nanorod-clusters with superior simulated sunlight photocatalytic performance

    B. Wang, G. Zhang, G. Cui, Y. Xu, Y. Liu and C. Xing, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C8QI01025K

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