Reduced TiO₂ nanotube arrays were obtained by hydrogen-thermal and electrochemical reduction methods respectively, and the photoelectrochemical performances were studied. Phase structures, elemental compositions, and surficial morphologies were characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) to investigate the structural differences between as-prepared TiO₂ NTAs and reduced TiO₂ NTAs, including two different reducing products. The photoelectrochemical performances of TiO₂ NTAs were found to be enhanced by both two reducing methods. The different mechanisms of hydrogen-thermal reduction and electrochemical reduction were investigated by comparing optical absorption, charge transport, separation efficiency of charge carriers, and surficial reactions during the photoelectrochemical processes. For hydrogen-thermal-reduced TiO₂ NTAs, the improved photoelectrochemical performances are induced by high optical absorption and low recombination of charge carries, whereas for electrochemical reduced TiO₂ NTAs, the enhanced performances are attributed to low charge transport resistance.

分别通过氢热还原法和电化学还原法获得了还原的TiO ₂纳米管阵列，并研究了其光电化学性能。通过X射线衍射（XRD），X射线光电子能谱（XPS）和扫描电子显微镜（SEM）表征相结构，元素组成和表面形态，以研究制得的TiO ₂ NTA和还原的TiO ₂ NTA之间的结构差异。TiO ₂ NTA，包括两种不同的还原产物。TiO ₂的光电化学性能发现通过两种还原方法均可以增强NTA。通过比较光电化学过程中的光吸收，电荷传输，电荷载流子的分离效率和表面反应，研究了氢热还原和电化学还原的不同机理。对于氢热还原的TiO ₂ NTA，通过高的光吸收和低的载流子复合来诱导改善的光电化学性能，而对于电化学还原的TiO ₂ NTA，增强的性能归因于低的电荷传输阻力。