Universität zu Köln

Wang, Meng, Pyeon, Myeongwhun, Goenuellue, Yakup, Kaouk, Ali, Shen, Shaohua, Guo, Liejin and Mathur, Sanjay (2015). Constructing Fe2O3/TiO2 core-shell photoelectrodes for efficient photoelectrochemical water splitting. Nanoscale, 7 (22). S. 10094 - 10101. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2040-3372

Full text not available from this repository.

Abstract

In this study, plasma enhanced chemical vapor deposition (PECVD) was utilized to co-axially modify hydrothermally grown Fe2O3 nanorod arrays by depositing a TiO2 overlayer to create Fe2O3/TiO2 core-shell photoelectrodes. Comprehensive structural (XRD, SEM, TEM) and compositional (XPS) analyses were performed to understand the effects of the TiO2 shell on the PEC activities of the Fe2O3 core. It was revealed that the heterojunction structure formed between TiO2 and Fe2O3, significantly improved the separation efficiency of photo-induced charge carriers and the oxygen evolution kinetics. A maximum photocurrent density of similar to 900 mu A cm(-2) at 0.6 V vs. saturated calomel electrode (SCE) was obtained for the Fe2O3/TiO2 photoelectrodes, which was 5 and 18 times higher when compared to that of hydrothermally synthesized Fe2O3 and PECVD synthesized TiO2 electrodes, respectively. Moreover, the Fe2O3/TiO2 core-shell nanorod arrays displayed superior stability for PEC water splitting. During 5000 s PEC measurements, a steady decrease of the photocurrent was observed, mainly attributed to the evolution of oxygen bubbles adsorbed on the working electrodes. This observation was verified by the complete recovery of the PEC performance demonstrated for a second 5000 s PEC measurement carried out after a brief time interval (10 min) that allowed the electrode surface to regenerate.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Meng UNSPECIFIED UNSPECIFIED UNSPECIFIED Pyeon, Myeongwhun UNSPECIFIED UNSPECIFIED UNSPECIFIED Goenuellue, Yakup UNSPECIFIED UNSPECIFIED UNSPECIFIED Kaouk, Ali UNSPECIFIED UNSPECIFIED UNSPECIFIED Shen, Shaohua UNSPECIFIED UNSPECIFIED UNSPECIFIED Guo, Liejin UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-419506
DOI:	10.1039/c5nr01493j
Journal or Publication Title:	Nanoscale
Volume:	7
Number:	22
Page Range:	S. 10094 - 10101
Date:	2015
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2040-3372
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THIN-FILMS; NANOROD ARRAYS; SOLID-SOLUTION; TIO2; HEMATITE; ALPHA-FE2O3; GROWTH; MICROSTRUCTURE; SUBSTITUTION; PHOTOANODES Multiple languages Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/41950