Electrically tuned photoelectrochemical properties of ferroelectric nanostructure NaNbO3 films

被引：23

作者：

Singh, Simrjit ^{[1
]}

Khare, Neeraj ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Phys, New Delhi 110016, India

来源：

APPLIED PHYSICS LETTERS | 2017年 / 110卷 / 15期

关键词：

THIN-FILMS; SEMICONDUCTORS; ARRAYS; SHELL;

D O I：

10.1063/1.4980100

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Photoelectrochemical (PEC) properties of NaNbO3 nanostructure ferroelectric films are investigated, and it is demonstrated that the efficiency of PEC water splitting can be tuned (7%-23%) by electrical polarization of the NaNbO3 films. The NaNbO3 photoelectrode is fabricated using hydrothermally synthesized NaNbO3 nanoparticles. Compared to the as-prepared photoanode, photocurrent is enhanced from 0.31 to 0.51mA/cm(2) (at 1V vs. Ag/AgCl) for the negatively polarized NaNbO3 film, whereas the photocurrent is found to decrease from 0.31 to 0.09mA/cm(2) for the positively polarized NaNbO3 film. The change in the photoelectrochemical activity after the polarization of NaNbO3 films has been attributed to the change in the conduction/valence band bending at the semiconductor/electrolyte interface, leading to a change in the efficiency of charge transfer at the interface. Mott-Schottky studies confirmed the change in band bending after polarization, and electrochemical impedance spectroscopy studies confirmed the modulation in the charge transfer process after polarization. Published by AIP Publishing.

引用

页数：5

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