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Improved Surface Charge Transfer in MoO3/BiVO4 Heterojunction Film for Photoelectrochemical Water Oxidation.
- Source :
-
Electrochimica Acta . Dec2017, Vol. 257, p181-191. 11p. - Publication Year :
- 2017
-
Abstract
- A MoO 3 /BiVO 4 heterojunction film consisting of dispersed nano-MoO 3 on the surface of BiVO 4 nanoflake was constructed for photoelectrochemical water oxidation. In comparison with bare BiVO 4 and MoO 3 film, the MoO 3 /BiVO 4 heterojunction film shows enhanced water oxidation activity. At 0.8 V vs. SCE, the photocurrent on the optimal MoO 3 /BiVO 4 heterojunction film increases by up to about 6 times compared to that on the bare BiVO 4 film. The conduction and valence band potential of MoO 3 are found to be more positive than those of BiVO 4 , and the electric conductivity for MoO 3 and BiVO 4 is on the order of 10 −6 S cm −1 and 10 −9 S cm −1 , respectively. Thus, the origin of enhanced water oxidation activity on the MoO 3 /BiVO 4 heterojunction film can be primarily ascribed to the band potential and conductivity differences between MoO 3 and BiVO 4 , which are advantageous for separating and transferring the surface charge of BiVO 4 . [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 257
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 126009980
- Full Text :
- https://doi.org/10.1016/j.electacta.2017.10.013