High-Efficiency Photoelectrocatalytic Hydrogen Generation Enabled by Palladium Quantum Dots-Sensitized TiO2 Nanotube Arrays

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• 作者：Meidan Ye ; Jiaojiao Gong ; Yuekun Lai ; Changjian Lin ; Zhiqun Lin
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：September 26, 2012
• 年：2012
• 卷：134
• 期：38
• 页码：15720-15723
• 全文大小：288K
• 年卷期：v.134,no.38(September 26, 2012)
• ISSN：1520-5126

文摘

TiO₂ nanotube arrays (TNTAs) sensitized by palladium quantum dots (Pd QDs) exhibit highly efficient photoelectrocatalytic hydrogen generation. Vertically oriented TNTAs were prepared by a three-step electrochemical anodization. Subsequently, Pd QDs with uniform size and narrow size distribution were formed on TiO₂ nanotubes by a modified hydrothermal reaction (i.e., yielding nanocomposites of Pd QDs deposited on TNTAs, Pd@TNTAs). By exploiting Pd@TNTA nanocomposites as both photoanode and cathode, a substantially increased photon-to-current conversion efficiency of nearly 100% at 位 = 330 nm and a greatly promoted photocatalytic hydrogen production rate of 592 渭mol路h^鈥?路cm^鈥? under 320 mW路cm^鈥? irradiation were achieved. The synergy between nanotubular structures of TiO₂ and uniformly dispersed Pd QDs on TiO₂ facilitated the charge transfer of photoinduced electrons from TiO₂ nanotubes to Pd QDs and the high activity of Pd QDs catalytic center, thereby leading to high-efficiency photoelectrocatalytic hydrogen generation.