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Enhanced photocatalytic performance: a ß-Bi2O3 thin film by nanoporous surface.

Authors :
Xin Yang
Xiaojuan Lian
Shangjun Liu
Gang Wang
Chunping Jiang
Jing Tian
Jinwei Chen
Ruilin Wang
Source :
Journal of Physics D: Applied Physics. 2013, Vol. 46 Issue 3, p1-6. 6p.
Publication Year :
2013

Abstract

Beta-Bi2O3 film photoanodes with different surface structures were prepared by oxidizing bismuth films. The physical properties were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible absorbance spectra and atomic force microscopy (AFM). XRD shows that all films are beta phase crystal structure except the thinnest 12 nm film. SEM and AFM characterizations indicate that a nanoporous surface structure is generated on the surface after the film is annealed for 3 h, while the films annealed for 1 h show a dense surface. The direct band gaps vary from 2.63 to 2.88 eV, with the film thickness decreasing from 500 to 12 nm. The nanoporous surface structure film exhibits better light harvesting ability and incident photon-to-electron conversion efficiency (IPCE) than the dense surface films. The IPCE (61% at 350 nm and 43% at 400 nm, 0.197VNHE) is the highest ever reported. The photocurrent density reaches 0.45mAcm-2 when illuminated with a bias of 1.23VNHE in 0.5M Na2SO3. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00223727
Volume :
46
Issue :
3
Database :
Academic Search Index
Journal :
Journal of Physics D: Applied Physics
Publication Type :
Academic Journal
Accession number :
90118405
Full Text :
https://doi.org/10.1088/0022-3727/46/3/035103