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- Title
CdS Nanoparticle-Modified α-FeO/TiO Nanorod Array Photoanode for Efficient Photoelectrochemical Water Oxidation.
- Authors
Yin, Ruiyang; Liu, Mingyang; Tang, Rui; Yin, Longwei
- Abstract
In this work, we demonstrate a facile successive ionic layer adsorption and reaction process accompanied by hydrothermal method to synthesize CdS nanoparticle-modified α-FeO/TiO nanorod array for efficient photoelectrochemical (PEC) water oxidation. By integrating CdS/α-FeO/TiO ternary system, light absorption ability of the photoanode can be effectively improved with an obviously broadened optical-response to visible light region, greatly facilitates the separation of photogenerated carriers, giving rise to the enhancement of PEC water oxidation performance. Importantly, for the designed abnormal type-II heterostructure between FeO/TiO, the conduction band position of FeO is higher than that of TiO, the photogenerated electrons from FeO will rapidly recombine with the photogenerated holes from TiO, thus leads to an efficient separation of photogenerated electrons from FeO/holes from TiO at the FeO/TiO interface, greatly improving the separation efficiency of photogenerated holes within FeO and enhances the photogenerated electron injection efficiency in TiO. Working as the photoanodes of PEC water oxidation, CdS/α-FeO/TiO heterostucture electrode exhibits improved photocurrent density of 0.62 mA cm at 1.23 V vs. reversible hydrogen electrode (RHE) in alkaline electrolyte, with an obviously negatively shifted onset potential of 80 mV. This work provides promising methods to enhance the PEC water oxidation performance of the TiO-based heterostructure photoanodes.
- Subjects
OXIDATION of water; CADMIUM sulfide; METAL nanoparticles; IRON oxides; TITANIUM dioxide; NANORODS; ANODES; PHOTOELECTROCHEMISTRY
- Publication
Nanoscale Research Letters, 2017, Vol 12, Issue 1, p1
- ISSN
1931-7573
- Publication type
Article
- DOI
10.1186/s11671-017-2278-3