Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting
| Autor: | Juan C. Arango, Edgar Resto, María Cotto, Florian Ion Petrescu, Abniel Machín, Kenneth Fontánez, Loraine Soto-Vázquez, Francisco Márquez, Carmen Morant, José Duconge |
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| Přispěvatelé: | UAM. Departamento de Física Aplicada |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Hydrogen hydrogen production Biomedical Engineering chemistry.chemical_element Nanoparticle Hydrogen Production Bioengineering 02 engineering and technology Zinc 010402 general chemistry lcsh:Technology 01 natural sciences Biochemistry water splitting Article Catalysis law.invention Biomaterials law Gold Nanoparticles Composite material Hydrogen production nanotechnology lcsh:T Graphene graphene Física 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry gold nanoparticles Water Splitting Photocatalysis ZnO Molecular Medicine Water splitting 0210 nano-technology Biotechnology |
| Zdroj: | Biomimetics Biblos-e Archivo. Repositorio Institucional de la UAM instname Biomimetics, Vol 5, Iss 39, p 39 (2020) Volume 5 Issue 3 |
| ISSN: | 2313-7673 |
| Popis: | For some decades, the scientific community has been looking for alternatives to the use of fossil fuels that allow for the planet&rsquo s sustainable and environmentally-friendly development. To do this, attempts have been made to mimic some processes that occur in nature, among which the photosystem-II stands out, which allows water splitting operating with different steps to generate oxygen and hydrogen. This research presents promising results using synthetic catalysts, which try to simulate some natural processes, and which are based on Au@ZnO&ndash graphene compounds. These catalysts were prepared by incorporating different amounts of gold nanoparticles (1 wt.%, 3 wt.%, 5 wt.%, 10 wt.%) and graphene (1 wt.%) on the surface of synthesized zinc oxide nanowires (ZnO NWs), and zinc oxide nanoparticles (ZnO NPs), along with a commercial form (commercial ZnO) for comparison purposes. The highest amount of hydrogen (1127 µ mol/hg) was reported by ZnO NWs with a gold and graphene loadings of 10 wt.% and 1 wt.%, respectively, under irradiation at 400 nm. Quantities of 759 µ mol/hg and 709 µ mol/hg were obtained with catalysts based on ZnO NPs and commercial ZnO, respectively. The photocatalytic activity of all composites increased with respect to the bare semiconductors, being 2.5 times higher in ZnO NWs, 8.8 times higher for ZnO NPs, and 7.5 times higher for commercial ZnO. The high photocatalytic activity of the catalysts is attributed, mainly, to the synergism between the different amount of gold and graphene incorporated, and the surface area of the composites. |
| Databáze: | OpenAIRE |
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