Photocurrent Properties of TiO2 Nanorods Grown on FTO by Hydrothermal Method Kim, Hyun; Yang, Bee Lyong;
In this work, we undertake a comparative study of the crystallographic microstructures and photo-catalytic properties of rutile nanorods grown on FTO facing up and down by a hydrothermal method. An analysis of the fine structures showed that nanorods grown on FTO facing up were mixed with sea urchin and microsphere. These structures induced a vertical orientation of the nanorods on FTO. The saturated photocurrent densities of the nanorods grown both up and down were in the former case, the IPCE was increased to 10% at 300~350 nm. The onset potential ( flat band potential) of the nanorods grown on FTO facing up is negatively shifted to a value of -0.31 V. This is caused by an increase in the surface state, in this case the number of oxygen vacancies, and by the formation of . Therefore, the FTO facing direction is considered as a critical factor during the hydrothermal reaction for growth so as to develop an efficient photo-catalytic system.
X. Li, J. Yu, J. Low, Y. Fang, J. Xiao, and X. Chen, "Engineering Heterogeneous Semiconductors for Solar Water Splitting," J. Mater. Chem., 3 2485-534 (2015).
Y. Ma, X. Wang, Y. Jia, X. Chen, H. Han, and C. Li, "Titanium Dioxide-Based Nanomaterials for Photocatalytic Fuel Generations," Chem. Rev., 114 9987-10043 (2014).
J. A. Cortes, J. Lara, P. Quintana, J. J. Alvarodo-gil, O. Contreras, and R. Rangel, "Advantages of Hydrothermal Synthesis to Produce Tunable $TiO_2$ Nanomicro Sized Photocatalysts and Their Effect in Lignin Degradation," Nano., 1550046 (2015).
H. Kim and B. L. Yang, "Effect of Seed Layers on $TiO_2$ Nanorod Growth on FTO for Solar Hydrogen Generation," Int. J. Hydrogen. Energy, 40 5807-14 (2015).
C. A. Grimes, O. K. Varghese, and S. Ranjan, "Light, Water, Hydrogen : The Solar Generation of Hydrogen by Water Photoelectrolysis," pp. 257-369, Springer, New York, 2008.
M. Radecka, M. Wierzbicka, S. Komornicki, and M. Rekas, "Influence of Cr on Photoelectrochemical Properties of $TiO_2$ Thin Films," Physica B, 348 [1-4] 160-68 (2004).