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Enhanced photoelectrochemical water splitting of CrTiO2 nanotube photoanodes by the decoration of their surface via the photodeposition of Ag and Au

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Abstract

It is of great significance to develop green fuels in order to prevent the accumulation of carbon dioxide generated by the combustion of conventional fossil fuels. A potential, clean, renewable alternative fuel, which may be produced from solar energy, stored and safely transported, is hydrogen. In this work, bare CrTiO2 NTs were fabricated using an in situ anodizing process. CrTiO2 NTs were then modified with the photodeposition of noble metals (Ag and Au) at different light irradiation times (10–120 min). The new photocatalysts have been characterized using SEM, EDX, XRD, Raman and UV-vis spectra. The impact of noble metals on the photo-electrochemical activities of the photocatalysts has been evaluated. In addition, electrochemical impedance spectroscopy was conducted for the semiconductor/electrolyte interface. Most of the current density is related to Ag4/CrTiO2 NTs and Au4/CrTiO2 NTs, and is nearly 2 and 3 times as that of the bare CrTiO2 NTs, respectively. All of the samples have adequate stability during continuous illumination for 1200 s. Finally, water splitting was performed under light irradiation at 0.6 V vs. Ag/AgCl for 60 min. Ag4/CrTiO2 NTs and Au4/CrTiO2 NTs have the highest H2 evolution among their families, corresponding to 0.52 and 0.80 ml cm−2 h−1, respectively.

Graphical abstract: Enhanced photoelectrochemical water splitting of CrTiO2 nanotube photoanodes by the decoration of their surface via the photodeposition of Ag and Au

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Publication details

The article was received on 10 Jun 2018, accepted on 31 Jul 2018 and first published on 03 Aug 2018


Article type: Paper
DOI: 10.1039/C8DT02383B
Citation: Dalton Trans., 2018, Advance Article
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    Enhanced photoelectrochemical water splitting of CrTiO2 nanotube photoanodes by the decoration of their surface via the photodeposition of Ag and Au

    T. Sharifi, Y. Ghayeb, T. Mohammadi and M. M. Momeni, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT02383B

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