Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5148222 | International Journal of Hydrogen Energy | 2016 | 10 Pages |
Abstract
BiVO4 has been receiving attention for applications in photoelectrochemical devices. This paper describes the effect of different alcohol solvents (ethanol, ethylene-glycol, PEG300 and PEG 400) on the morphology, crystal growth, crystalline size, thickness, photophysical and photoelectrochemical properties of BiVO4 photoanodes prepared from a suitable, simple and inexpensive one-step process. All samples exhibited good crystallinity with the monoclinic phase dominating and with suitable bandgap for visible light harvesting; but the morphology, thickness, and resulting photocurrents varied broadly. The unmodified BiVO4 photoanode prepared with PEG 300, gave a particularly good photocurrent of 0.77Â mAÂ cmâ2 at 1.23Â V vs RHE under illumination of 100Â mWÂ cmâ2. In this case, a higher value for the ratio between the intensities of the XRD peaks, (040)/(121), was verified, as well as smaller crystallite size. Considering the type of solvent, the BiVO4 photoanode prepared with PEG 300 exhibited a more intense photocurrent. The optimization of the solvent employed in the synthesis of the BiVO4 photoanode is a crucial step in the development of a photoelectrochemical device based on this material.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Francisco Wirley Paulino Ribeiro, Murilo Fernando Gromboni, Frank Marken, Lucia H. Mascaro,