Department of Materials Science WW-4, LKO, University of Erlangen-Nuremberg , Martensstrasse 7, 91058 Erlangen, Germany.
Nano Lett. 2014 Jun 11;14(6):3309-13. doi: 10.1021/nl500710j. Epub 2014 May 13.
Here we report that TiO2 nanotube (NT) arrays, converted by a high pressure H2 treatment to anatase-like "black titania", show a high open-circuit photocatalytic hydrogen production rate without the presence of a cocatalyst. Tubes converted to black titania using classic reduction treatments (e.g., atmospheric pressure H2/Ar annealing) do not show this effect. The main difference caused by the high H2 pressure annealing is the resulting room-temperature stable, isolated Ti(3+) defect-structure created in the anatase nanotubes, as evident from electron spin resonance (ESR) investigations. This feature, absent for conventional reduction, seems thus to be responsible for activating intrinsic, cocatalytic centers that enable the observed high open-circuit hydrogen generation.
在这里，我们报告说，经过高压 H2 处理转化为类似锐钛矿的“黑钛”的 TiO2 纳米管（NT）阵列，在没有助催化剂的情况下表现出高的开路光催化制氢速率。使用经典还原处理（例如，常压 H2/Ar 退火）转化为黑钛的管不显示这种效果。高压 H2 退火引起的主要区别是在锐钛矿纳米管中形成的室温稳定的孤立 Ti(3+)缺陷结构，这可以从电子自旋共振（ESR）研究中明显看出。这种特征在常规还原中不存在，因此似乎负责激活内在的、助催化中心，从而实现观察到的高开路制氢。
