Unraveling compositional effects on the light-induced oxygen evolution in Bi(V–Mo–X)O4 material libraries
| Autor: | Alfred Ludwig, Felipe Conzuelo, Wolfgang Schuhmann, Ramona Gutkowski, Chinmay Khare, Yasin Ugur Kayran |
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| Rok vydání: | 2017 |
| Předmět: |
Photocurrent
Materials science Renewable Energy Sustainability and the Environment Analytical chemistry Oxygen evolution chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Pollution Oxygen 0104 chemical sciences Nuclear Energy and Engineering Transition metal chemistry Sputtering Environmental Chemistry Atomic ratio Thin film 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Energy & Environmental Science. 10:1213-1221 |
| ISSN: | 1754-5706 1754-5692 |
| DOI: | 10.1039/c7ee00287d |
| Popis: | The influence of co-deposited transition metals X (X = Ta, W, Nb) with various relative concentrations on the photoelectrochemical performance of BiVO4 is investigated. Thin film material libraries with well-defined composition gradients of Bi, V and two transition metals are fabricated by combinatorial sputter co-deposition. Materials with the highest photoelectrochemical performance are identified by high-throughput characterization of the Bi(V–Mo–X)O4 material libraries using an optical scanning droplet cell. Bi(V–Mo–W)O4 and Bi(V–Mo–Nb)O4 material libraries show the highest improvement in the photocurrent, with ten times higher photocurrents of up to 1 mA cm−2 compared to a BiVO4 reference material library. Deviations from the V : Bi equiatomic ratio lead to a decrease in the photocurrent for pristine monoclinic BiVO4. By the addition of transition metals this effect is minimized and no significant decrease in the photocurrent occurs up to 10 at% variation from the equiatomic V : Bi ratio. Excellent photoelectrochemical performance is reached under these conditions in regions with a V : Bi atomic ratio of 70 : 30 and co-deposited Nb concentrations of >10 at%. Scanning photoelectrochemical microscopy allows the evaluation of the correlation between the generated oxygen at a photoanode and the measured photocurrent. |
| Databáze: | OpenAIRE |
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