Photoelectrochemical properties of “increasingly dark” TiO2 nanotube arrays

Denisov N, Qin S, Cha G, Yoo JE, Schmuki P (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Article Number: 114098

DOI: 10.1016/j.jelechem.2020.114098

Abstract

“Black” TiO2 nanotube arrays (TNTAs) of different darkness are formed by thermal reduction of anodic TiO2 nanotube layers in H2 atmosphere at different temperatures (300–500 °C), and their (photo-)electrochemical properties are studied by IPCE spectroscopy, transient photocurrent measurements, IMPS, PEIS, CV, and Mott-Schottky analysis. Hydrogenation of the TNTAs leads to the enhancement of their IPCE (by up to 1.5 times), despite increased recombination losses at anodic potentials. Reduced TNTAs demonstrate a “metallic” behavior by a characteristic frequency response of their impedance and phase angle, reduced charge transfer resistance at anodic bias, increased double layer capacitance, and remarkably increased donor densities (up to 7.25 × 10²³ cm⁻³). The observed alterations in the properties of TNTAs after hydrogenation are ascribed to the formation of defects and TiHx.

Authors with CRIS profile

How to cite

APA:

Denisov, N., Qin, S., Cha, G., Yoo, J.E., & Schmuki, P. (2020). Photoelectrochemical properties of “increasingly dark” TiO2 nanotube arrays. Journal of Electroanalytical Chemistry. https://dx.doi.org/10.1016/j.jelechem.2020.114098

MLA:

Denisov, Nikita, et al. "Photoelectrochemical properties of “increasingly dark” TiO2 nanotube arrays." Journal of Electroanalytical Chemistry (2020).

BibTeX: Download