Uniform NiPx nanospheres loaded onto defective HxWO3-y with three-dimensionally ordered macroporous structure for photocatalytic nitrogen reduction
| Autor: | Mengyang Xia, Xiaoqing Yan, Guidong Yang, Xiaoling Ren, Ben Chong, Nathan Wells |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Process Chemistry and Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nitrogen Oxygen Redox Catalysis 0104 chemical sciences Ammonia production Ammonia chemistry.chemical_compound Adsorption Chemical engineering chemistry Photocatalysis Charge carrier 0210 nano-technology General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 297:120468 |
| ISSN: | 0926-3373 |
| Popis: | Ammonia synthesis from N2 and water can be achieved at mild conditions utilizing photocatalysis, however the high activation energy for nitrogen coupled with low electron-hole separation efficiency in the photocatalyst results in a low rate of ammonia generation. In this work, a three-dimensional ordered macroporous structure (3DOM) HxWO3-y with oxygen vacancies was constructed, which promoted the activation of nitrogen and increased charge carrier separation, thus improving the photocatalytic nitrogen reduction ability with a value of 7.4 μmol g−1 h−1. The nitrogen reduction ability of 3DOM HxWO3-y was further improved to 34 μmol g−1 h−1 by loading NiPx nanospheres onto the 3DOM structure, which is ∼5 times than 3DOM HxWO3-y. DFT analysis revealed that the oxygen vacancies in HxWO3-y showed higher adsorption activation ability of N2 with the nitrogen reduction reaction (NRR) proceeding in a symmetrical alternating pathway. This study offers a promising route for the N2 fixation using solar energy. |
| Databáze: | OpenAIRE |
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