Integration of Molybdenum-Doped, Hydrogen-Annealed BiVO 4 with Silicon Microwires for Photoelectrochemical Applications
| Autor: | Alexander Milbrat, Jurriaan Huskens, Yuxi Guo, Wouter Vijselaar, Guido Mul, Bastian Mei |
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| Přispěvatelé: | Photocatalytic Synthesis, Molecular Nanofabrication |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
PEC devices Silicon Hydrogen General Chemical Engineering Performance UT-Hybrid-D chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Environmental Chemistry BiVO Sulfite oxidation Silicon geometry Renewable Energy Sustainability and the Environment Doping BiVO4 General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Indium tin oxide chemistry Chemical engineering Molybdenum BiOI 0210 nano-technology Research Article |
| Zdroj: | ACS Sustainable Chemistry and Engineering, 7(5), 5034-5044. American Chemical Society ACS Sustainable Chemistry & Engineering |
| ISSN: | 2168-0485 |
| Popis: | H-BiVO4–x:Mo was successfully deposited on microwire-structured silicon substrates, using indium tin oxide (ITO) as an interlayer and BiOI prepared by electrodeposition as precursor. Electrodeposition of BiOI, induced by the electrochemical reduction of p-benzoquinone, appeared to proceed through three stages, being nucleation of particles at the base and bottom of the microwire arrays, followed by rapid (homogeneous) growth, and termination by increasing interfacial resistances. Variations in charge density and morphology as a function of spacing of the microwires are explained by (a) variations in mass transfer limitations, most likely associated with the electrochemical reduction of p-benzoquinone, and (b) inhomogeneity in ITO deposition. Unexpectedly, H-BiVO4–x:Mo on microwire substrates (4 μm radius, 4 to 20 μm spacing, and 5 to 16 μm length) underperformed compared to H-BiVO4–x:Mo on flat surfaces in photocatalytic tests employing sulfite (SO32–) oxidation in a KPi buffer solution at pH 7.0. While we cannot exclude optical effects, or differences in material properties on the nanoscale, we predominantly attribute this to detrimental diffusion limitations of the redox species within the internal volume of the microwire arrays, in agreement with existing literature and the observations regarding the electrodeposition of BiOI. Our results may assist in developing high-efficiency PEC devices. We discuss the effect of the Si architecture on the performance of H-BiVO4:Mo in the oxidation of sulfite to sulfate, providing indications of applicability in solar-to-fuel devices. |
| Databáze: | OpenAIRE |
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