EIS study of photo-induced modifications of nano-columnar TiO2 films

Effect of CoOOH loading on the photoelectrocatalytic performance of WO3 nanorod array film

“…7 shows impedance spectra of the WO 3 and the WO 3 -CoOOH electrodes with a bias of 0.3 V under illumination. The EIS Nyquist plots can provide the information on the transfer resistance and the separation efficiency of the photo-generated electron-hole pairs [27]. The curvature radius of EIS Nyquist plot for WO 3 -CoOOH is obviously smaller than that for WO 3 , indicating that the deposited CoOOH decreases the charge transfer resistance and enhances electron/hole pair separation [28].…”

Electrochemical impedance spectroscopy to study photo - induced effects on self-organized TiO2 nanotube arrays

“…), the performances of solar cells are strongly limited by the rate of photo induced charge transport through the layer, and consequently by efficiency of charge sep- aration or recombination. Many authors [18][19][20][21][22][23][24][25][26][27] have shown in the past that the electron occupancy of some conduction band states and/or sub-band gap states is a key parameter controlling the charge recombination kinetics, since these states are active in mediating electron transfer processes. Electron occupancy of the states may be induced by optically driven electron injection or by the application of an external potential.…”

Directing photocatalytic and photoelectrocatalytic performance of TiO2 by using TEA and NH4F as doping precursors

“…Finally, when illumination is turned off, OCP slowly returns to its value in the dark, particularly for materials modified with TEA (TiO 2 -T and TiO 2 -TNF). This indicates that the defects induced by this dopant agent (TEA) act as electron traps (or deep energetic states), diminishing the recombination events in the materials [67].…”