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

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• 作者：Shipu Li ; Peng Zhang ; Xuefeng Song ; Lian Gao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 26, 2015
• 年：2015
• 卷：7
• 期：33
• 页码：18560-18565
• 全文大小：358K
• ISSN：1944-8252

文摘

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%.