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

被引:586
作者
Ye, Meidan [1 ,2 ]
Gong, Jiaojiao [1 ,2 ]
Lai, Yuekun [1 ,2 ]
Lin, Changjian [1 ,2 ]
Lin, Zhiqun [3 ]
机构
[1] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China
[2] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Dept Chem, Xiamen 361005, Peoples R China
[3] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
基金
中国国家自然科学基金;
关键词
SOLAR-CELLS; PD NANOPARTICLES; WATER; CATALYST; FILMS; GOLD; DIOXIDE; TITANIA;
D O I
10.1021/ja307449z
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 lambda = 330 nm and a greatly promoted photocatalytic hydrogen production rate of 592 mu mol.h(-1).cm(-2) under 320 mW.cm(-2) 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.
引用
收藏
页码:15720 / 15723
页数:4
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