Wierzbicka Ewa, Zhou Xuemei, Denisov Nikita, Yoo JeongEun, Fehn Dominik, Liu Ning, Meyer Karsten, Schmuki Patrik
Department of Materials Science WW-4, LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058, Erlangen, Germany.
Department of Chemical and Materials Engineering, Complutense University of Madrid, Av. Complutense, s/n, 28040, Madrid, Spain.
ChemSusChem. 2019 May 8;12(9):1900-1905. doi: 10.1002/cssc.201900192. Epub 2019 Apr 4.
Illumination of anatase in an aqueous methanolic solution leads to the formation of Ti sites that are catalytically active for the generation of dihydrogen (H ). With increasing illumination time, a light-induced self-amplification of the photocatalytic H production rate can be observed. The effect is characterized by electron paramagnetic resonance (EPR) spectroscopy, reflectivity, and photoelectrochemical techniques. Combined measurements of H generation rates and in situ EPR spectroscopic observation over the illumination time with AM 1.5G or UV light establish that the activation is accompanied by the formation of Ti states, which is validated through their characteristic EPR resonance at g=1.93. This self-activation and amplification behavior can be observed for anatase nanoparticles and nanotubes.
在甲醇水溶液中光照锐钛矿会导致形成对氢气（H₂）生成具有催化活性的钛位点。随着光照时间增加，可以观察到光催化产氢速率的光诱导自放大现象。该效应通过电子顺磁共振（EPR）光谱、反射率和光电化学技术进行表征。结合在AM 1.5G或紫外光照射时间内对产氢速率的测量以及原位EPR光谱观察，证实这种活化伴随着钛态的形成，这通过它们在g = 1.93处的特征EPR共振得到验证。对于锐钛矿纳米颗粒和纳米管可以观察到这种自活化和放大行为。
