Integration of 2D printing technologies for AV2O6 (A=Ca, Sr, Ba)-MO (M=Cu, Ni, Zn) photocatalyst manufacturing to solar fuels production using seawater
| Autor: | A. Aguirre-Astrain, E. Luévano-Hipólito, Leticia M. Torres-Martínez |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Non-blocking I/O Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Crystallinity Fuel Technology Pilot plant Distilled water Chemical engineering chemistry Photocatalysis Seawater Photocatalytic water splitting |
| Zdroj: | International Journal of Hydrogen Energy. 46:37294-37310 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2021.09.007 |
| Popis: | The non-polluting nature of photocatalytic H2 production makes of interest the study of semiconductors for this process. Scale-up of the photocatalytic hydrogen process to a pilot plant requires the photocatalyst's immobilization to enhance the charge transfer and facilitate its recovery. In this work, screen-printed films from the AV2O6 (A = Ca, Sr, Ba) semiconductor family were fabricated and evaluated in photocatalytic water splitting for H2 production in distilled water and seawater under UVA light. The films exhibited ∼3.1 eV band gaps, high crystallinity, and heterogeneous morphologies. BaV2O6 film exhibited the highest H2 production in distilled water (691 μmol/g), related to the synergistic effect between a higher crystallinity and traces of V+4 species that decrease the recombination of the photogenerated charges. Also, to take advantage of the dissolved species in seawater that could act as sacrificial agents, the BaV2O6 film was evaluated in seawater, in which H2 production was up to 6 times higher (4374 μmol/g) than in distilled water. The BaV2O6 film was decorated with simple oxides (CuO, NiO, and ZnO) by the ink-jet printing technology to increase its photocatalytic performance for H2 production. The highest efficiency with distilled water was obtained with the BaV2O6-CuO film, which reached an H2 production up to 30 times higher than the bare BaV2O6, own to the n-p heterostructure formation that enhances the charge transport in the photocatalytic process. When the BaV2O6-CuO film was evaluated in seawater, a more constant H2 production was observed; moreover, the efficiency was similar compared to the production in distilled water (20,563 μmol/g). To elucidate the seawater compounds that most influence the H2 production, a two levels Plackett–Burman experiments design was carried out in simulated seawater. The analysis revealed that the SO42− ions from the CaSO4 could be decreasing the H2 production by acting as Lewis's acid sites that trap the photogenerated e− competing for its usage with the H+. Additionally, the Cl− ions and the HCO3− reduction improved the HCOOH production from simulated seawater, reaching 26 times a higher production (23,333 μmol/g) than in distilled water. |
| Databáze: | OpenAIRE |
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