Water-splitting properties of bi-phased TiO2 nanotube arrays subjected to high-temperature annealing
Water-splitting properties of bi-phased TiO2 nanotube arrays subjected to high-temperature annealing
复制标题
DOI：
10.1016/j.ceramint.2020.05.246
复制
发表时间：
2020-09
影响因子：
5.2
通讯作者：
K. Chahrour;F. Yam;A. Eid
中科院分区：
文献类型：
--
作者：
K. Chahrour;F. Yam;A. Eid
对高温退火（450 ° C~850 ° C）下阳极TiO2纳米管阵列（TNTs）薄膜的形貌、晶相转化与光电化学水分解性能之间的关系进行了深入研究。提供明显的可视化以支持高达850 ° C的高温退火对TNT膜的光电流生产率的影响，TNT膜基于结晶锐钛矿-金红石组成比充当光阳极。为了评估不同退火材料的光电化学生产率，利用了几种电化学技术，即电化学阻抗谱（EIS），计时电流法和动电位极化（PP）。结果表明，晶型双相（金红石/金红石）TiO2纳米管阵列对光电化学水裂解具有协同作用.发现在650 ° C下具有双相含量组成（66%金红石和34%金红石）的退火的TNT膜表现出最大的光电化学水裂解性质，具有0.41%的显著的施加偏压光子-电流转换效率（ABPE %）。这些结果描述了一个有前途的目标，为制造高性能的双相结晶（金红石和金红石）纳米多孔的TNT，以提高光电化学水分解效率。入射光子-电子转换效率测量（IPCE %）也显示了在650 ° C下退火样品的优越性（43.4%），这与EIS、PP和ABPE %计算一致。
An extended study was conducted to correlate between morphological, crystalline phase conversion and the photoelectrochemical water-splitting properties of anodic TiO2nanotube arrays (TNTs) films annealed at elevated temperatures, starting from 450 °C to 850 °C. A distinct visualization was provided to support the effect of the high temperature annealing up to 850 °C on the photocurrent productivity of the TNTs films, which acted as photoanodes based on the crystalline anatase-rutile composition ratio. To assess the photoelectrochemical productivity for different annealed materials, several electrochemical techniques were utilized namely; electrochemical impedance spectroscopy (EIS), chronoamperometry and potentiodynamic polarization (PP). Results indicated that the crystalline bi-phased (anatase/rutile) TiO2nanotube arrays synergistically influenced the photoelectrochemical water splitting. It was found that the annealed TNTs film with bi-phase content composition (66% anatase and 34% rutile) at 650 °C exhibited maximum photoelectrochemical water-splitting properties with a significant applied bias photon-to-current conversion efficiency (ABPE%) of 0.41%. These results describe a promising target for the fabrication of high performance bi-phase crystalline (anatase and rutile) nanoporous TNTs for improving the photoelectrochemical water-splitting efficiency. Incident photon-to-electron conversion efficiency measurements (IPCE%) also showed the superiority of annealed sample at 650 °C (43.4%), which agrees with EIS, PP and ABPE% calculations.