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Spiky nanohybrids of TiO2/Au nanorod for enhanced hydrogen evolution and photocurrent generation

Abstract

The fabrication of photocatalysts has attracted broad interest to achieve efficient utilization of renewable solar energy. Herein, a plasmonic spiky TiO2/Au nanorod (NR) nanohybrid has been prepared by in-situ nucleation and growth of spiky TiO2 in AuNR colloidal solution. The spiky TiO2/AuNR nanohybrids demonstrate enhanced hydrogen evolution activity and photocurrent generation under both visible light and simulated solar light irradiation compared to bare spiky TiO2 nanoparticles and commercial TiO2. Specifically, spiky nanohybrids display a high H2 production rate of 1.81 mmol g-1 h-1 under simulated solar light irradiation, which is 1.7 times greater than that of TiO2/Au nanosphere nanohybrids, and maintain stable in three cycles. The improved photocatalytic H2 evolution of the nanohybrids can be ascribed to the coupling effect of AuNRs and the unique spiky structure. Furthermore, the charge transfer process during the H2 evolution has been investigated by photocurrent and electrochemical impendence spectroscopy (EIS) measurements. A fast and stable photocurrent has been observed for the spiky TiO2/AuNR nanohybrid photoelectrode under both visible light and simulated solar light irradiation, while the EIS plots indicate a quick charge transfer for the nanohybrids. Such a nanohybrid with bio-inspired structure will afford new insights for the fabrication of novel photocatalysts.

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Publication details

The article was received on 15 Nov 2017, accepted on 23 Dec 2017 and first published on 26 Dec 2017


Article type: Research Article
DOI: 10.1039/C7QI00717E
Citation: Inorg. Chem. Front., 2017, Accepted Manuscript
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    Spiky nanohybrids of TiO2/Au nanorod for enhanced hydrogen evolution and photocurrent generation

    S. Zeng, H. Sun, Y. Wu, Y. Shang, P. She, Q. He, S. Yin and Z. Liu, Inorg. Chem. Front., 2017, Accepted Manuscript , DOI: 10.1039/C7QI00717E

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