Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting
| Autor: | Sami Elhag, Omer Nur, Zafar Hussain Ibupoto, Elfatih Mustafa, Magnus Willander, Rania Elhadi Adam, Aneela Tahira |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope chemistry.chemical_element ZnO nanorods 02 engineering and technology Zinc engineering.material 010402 general chemistry Photochemistry 01 natural sciences Photochemical water splitting Inorganic Chemistry chemistry.chemical_compound Phase (matter) Materials Chemistry Fysik Physical and Theoretical Chemistry Aqueous solution Layered double hydroxides 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry Physical Sciences Ceramics and Composites engineering Photocatalysis Water splitting Hydroxide Ni–Fe layered double hydroxides 0210 nano-technology |
| Popis: | Zinc oxide (ZnO) nanostructures are widely investigated for photocatalytic applications but the functional properties are limited by the fast carrier recombination rate, which is an intrinsic property of ZnO. To optimize the recombination rate of ZnO, a study is carried out in which it is covered with Ni-Fe layered double hydroxides and synergistic effects are created which boosted the photocatalytic activity of ZnO. The nanostructured materials are synthesized by the low temperature aqueous chemical growth and electrodeposition methods. These nanostructures are characterized by scanning electron microscopy (SEM) and powder X-ray diffraction (XRD) technique. SEM study has revealed a Ni–Fe LDH coated ZnO NRs. The powder XRD has showed a cubic phase of the Ni-Fe layered double hydroxide on the ZnO NRs having an excellent crystalline quality. The optical characterization has shown low scattering of light for the Ni–Fe LDH coated ZnO NRs sample. The sample prepared with deposition time of 25 s showed excellent photochemical water splitting properties compared to counter photo-anodes in alkaline media. The photo response was highly stable and fast. The incident photon to current conversion efficiency for the photo-anode of Ni–Fe(LDHs)/ZnO over 25 s was 82% at a maximum absorption of 380 nm compared to the pristine ZnO NRs which has 70% at the same wavelength. This study is providing a simple, cost effective, earth abundant and environment friendly methodology for the fabrication of photo-anodes for diverse applications specifically water oxidation and solar radiation driven water splitting. Funding agencies: department of Science and Technology, Campus Norrkoping, Linkoping University, Sweden |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|