N/Si co-doped oriented single crystalline rutile TiO2 nanorods for photoelectrochemical water splitting

作者：Zhang Xiaofan; Zhang Bingyan; Zuo Zhixiang; Wang Mingkui; Shen Yan^*

来源：Journal of Materials Chemistry A, 2015, 3(18): 10020-10025.

DOI：10.1039/c5ta00613a

Chemical modification of the aligned single crystalline TiO2 nanorods provides possibilities to improve their photoelectrochemical (PEC) activity under visible light. This work reports on the N/Si co-doped single crystal rutile TiO2 nanorods fabricated by a flexible one-step hydrothermal procedure for PEC water splitting, exhibiting a photocurrent of 1.77 mA cm(-2) at 1.23 V vs. RHE and a noticeable visible-light response under standard testing conditions (xenon lamp with an AM 1.5 G filter, 100 mW cm(-2)). The excellent PEC activity can be attributed to the synergetic effect of N and Si co-dopants, which enhances the incident photon to current conversion efficiency both in ultraviolet and visible regions, and improves the charge transfer at the photoanode/electrolyte interface. A solar-powered water splitting device has been designed by combining an efficient perovskite solar cell with the N/Si co-doped TiO2 NRs-based PEC system, achieving an overall solar-to-hydrogen efficiency of 1.1%. This has been the highest value reported for TiO2-based PEC systems so far.

• 出版日期2015
• 单位华中科技大学