Nanostructured Ternary FeCrAl Oxide Photocathodes for Water Photoelectrolysis
| Autor: | Dina Fattakhova-Rohlfing, Ilina Kondofersky, Goran Stefanic, Bruce A. Parkinson, Alexander Müller, Martin Ehrensperger, Alesja Ivanova, Christina Scheu, Halina K. Dunn, Thomas Bein |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Oxide Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Catalysis Photocathode 0104 chemical sciences photoelectrochemical water splitting FeCrAl oxide sol-gel synthesis of ternary oxides structured ternary oxides solar energy conversion chemistry.chemical_compound Colloid and Surface Chemistry Chemical engineering Transmission electron microscopy Photoelectrolysis Electrode 0210 nano-technology Mesoporous material Stoichiometry Hydrogen production |
| Zdroj: | Journal of the American Chemical Society. 138:1860-1867 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/jacs.5b08040 |
| Popis: | A sol-gel method for the synthesis of semiconducting FeCrAl oxide photocathodes for solar-driven hydrogen production was developed and applied for the production of meso- and macroporous layers with the overall stoichiometry Fe0.84Cr1.0Al0.16O3. Using transmission electron microscopy and energy-dispersive X-ray spectroscopy, phase separation into Fe- and Cr-rich phases was observed for both morphologies. Compared to prior work and to the mesoporous layer, the macroporous FeCrAl oxide photocathode had a significantly enhanced photo electrolysis performance, even at a very early onset potential of 1.1 V vs RHE. By optimizing the macroporous electrodes, the device reached current densities of up to 0.68 mA cm(-2) at 0.5 V vs RHE under AM 1.5 with an incident photon-to-cur-rent efficiency (IPCE) of 28% at 400 nm without the use of catalysts. Based on transient measurements, this performance increase could be attributed to an improved collection efficiency. At a potential of 0.75 V vs RHE, an electron transfer efficiency of 48.5% was determined. |
| Databáze: | OpenAIRE |
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