Au和Ag修饰TNTAs阵列及光电催化甘油转化研究.

TiO2 nanotube arrays (TNTAs) were prepared by anodic oxidation with a tube diameter of 60 nm and a tube length of 5.4/im. Further Au- and Ag-modified TNT As/Au and TNT As/Ag nanotube arrays were prepared by electrodeposition. The effects of loading with different Au and Ag contents on the photoanodic photo-electrocatalytic conversion of glycerol-coupled hydrogen production coupling were evaluated. The results showed that TNT As loaded with Au and Ag could photo catalytically convert glycerol into high value-added products such as glyceraldehyde (GLI)) and dihydroxy ace tone (T)H A) and produce hyd rogen synergistically. TNT As/Au (0.08 m mol/L) and TNT As/Ag (0.04 mM) showed the highest catalytic performance with hydrogen production rates of 213.8/imol/cm²/h and 198.1/imol/cm1/h, glycerol conversion of 4.6 % and 4.4%, and T)H A selectivity of 15.4% and 15.3%, respectively. The best performance of the samples was attributed to the plasmon resonance effect of the metal nanoparticles, i.e., the metal acted as an electron trap to effectively gather the photoexcited electrons, and the electrons in the TiO2 conduction band were transferred to the metal to prevent the compounding of photogenerated electron-hole pairs, which effectively improved the catalytic performance of the TiO2 nanotube arrays. [ABSTRACT FROM AUTHOR]