期刊
LANGMUIR
卷 31, 期 12, 页码 3727-3737出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.5b00486
关键词
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资金
- Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013M3A6B1078879]
- Industrial Strategic Technology Development Program - Ministry of Knowledge Economy (MICE, Korea) [10045221]
- Deanship of Scientific Research at King Saud University [RGP-089]
- [NRF-2013R1A2A2A05005589]
We demonstrate, for the first time, electrostatically sprayed bismuth vanadate (BiVO4) thin films for photoelectrochemical water splitting. Characterization of these films by X-ray diffraction, Raman scattering, and high-resolution scanning electron microscopy analyses revealed the formation of nanotextured pillar-like structures of highly photo active monoclinic scheelite BiVO4. Electrosprayed BiVO4 nanostructured films yielded a photocurrent density of 1.30 and 1.95 mA/cm(2) for water and sulfite oxidation, respectively, under 100 mW/cm(2) illumination. The optimal film thickness was 3 mu m, with an optimal postannealing temperature of 550 degrees C. The enhanced photocurrent is facilitated by formation of pillar-like structures in the deposit. We show through modeling that these structures result from the electrically-driven motion of submicron particles in the direction parallel to the substrate, as they approach the substrate, along with Brownian diffusion. At the same time, opposing thermophoretic forces slow their approach to the surface. The model of these processes proposed here is in good agreement with the experimental observations.
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