Controlled nanostructured morphology of BiVO4 photoanodes for efficient on-demand catalysis in solar water-splitting and sustainable water-treatment
| Autor: | Cheol Hyoun Ahn, Su Ho Jung, R.R. Koli, Hyung Koun Cho, Y.B. Kim, Nishad G. Deshpande, Dong Su Kim, A.S. Jamadar |
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| Rok vydání: | 2020 |
| Předmět: |
Photocurrent
Materials science Nanoporous General Physics and Astronomy Nanoparticle 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Crystal chemistry.chemical_compound Chemical engineering chemistry Bismuth vanadate Photocatalysis Water splitting Thin film 0210 nano-technology |
| Zdroj: | Applied Surface Science. 514:146075 |
| ISSN: | 0169-4332 |
| Popis: | Improving the kinetic properties of Bismuth vanadate (BiVO4) by nanoparticles or controlling the morphology of decagonal particles with crystal facets is receiving strong interest. Accordingly, we report an effective water-splitting and -purification system based on the photocatalytic performance of BiVO4 using a combined nano-structured morphology and crystal facets. BiVO4 thin film spin-coated at different Bi/V concentrations (viz. 1, 2, and 3) revealed a drastic change from nanoparticle (multifacet) to combined nanostructured morphology i.e., nanoparticles and sheet-like (decagonal facet). Such a morphology with multi-crystal facet in which {0 1 0} and {1 1 0} planes are prevalently active surfaces for Bi/V = 3 sample was found to disrupt the laminar boundary layer effectively, as confirmed from the lower contact-angle. Moreover, improved intercalation of the electrolyte in the nanoporous BiVO4 layer resulted in excellent photoelectrochemical performance with a photocurrent density of 1.98 mA/cm2 (@1.23 VRHE) and on-set potential of 0.40 VRHE in hole-scavenger compared to simple morphology. Congo-red (CR) and methylene-blue (MB) dye remediation under solar-radiation indicated an excellent degradation efficiency of 86 % in 90 min and 96 % in 300 min, respectively. Interestingly, the dual nanostructured morphology maintained consistent performance in ~5 (CR) and 9 (MB) repeated batch runs, demonstrating their high photocatalytic activity under visible-light and good durability in repeated use. Our results suggest that changes in the Bi/V ratio help tailoring the crystal facet from the {0 1 0} to a combined {0 1 0} and {1 1 0} with the evolution of dual nanostructured morphology, which increases the charge-transfer efficiency and is beneficial for efficient water-splitting and water-treatment processes. |
| Databáze: | OpenAIRE |
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