Photoelectrochemical Hydrogen Production of TiO2 Passivated Pt/Si-Nanowire Composite Photocathode

Si nanowire (SiNW) arrays decorated with Pt nanoparticles are passivated with TiO2 surface layer using atomic layer deposition (ALD). The sandwich structure TiO2/Pt/SiNW shows superior photoelectrochemical performance to the control planar silicon electrodes, especially under the concentrated solar...

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Bibliographic Details
Published inACS applied materials & interfaces Vol. 7; no. 33; pp. 18560 - 18565
Main Authors Li, Shipu, Zhang, Peng, Song, Xuefeng, Gao, Lian
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 26.08.2015
Subjects
photoelectrochemical
passivation
ALD
hydrogen
Si nanowire arrays
TiO2
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Summary:Si nanowire (SiNW) arrays decorated with Pt nanoparticles are passivated with TiO2 surface layer using atomic layer deposition (ALD). The sandwich structure TiO2/Pt/SiNW shows superior photoelectrochemical performance to the control planar silicon electrodes, especially under the concentrated solar radiation. Pt nanoparticles separated from aqueous electrolyte by TiO2 layer of more than 15 nm still well catalyze surface photoelectrochemical hydrogen production without direct contact to the electrolyte. This structural configuration shows remarkable chemical stability and anodically shifted onset potential, suggesting great promise for applications in solar hydrogen production. The maximum photon-to-energy conversion efficiency of the TiO2/Pt/SiNW reaches 15.6%.
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ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.5b04936