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URN to cite this document: urn:nbn:de:bvb:703-epub-7116-2
Title data
Zander, Judith ; Timm, Jana ; Weiß, Morten ; Marschall, Roland:
Light-Induced Ammonia Generation over Defective Carbon Nitride Modified with Pyrite.
In: Advanced Energy Materials.
Vol. 12
(2022)
Issue 43
.
- No. 2202403.
ISSN 1614-6840
DOI der Verlagsversion: https://doi.org/10.1002/aenm.202202403
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Abstract
Photocatalytic nitrogen fixation under ambient conditions is currently widely explored in an attempt to develop a sustainable alternative for the Haber–Bosch process. In this work, defect-rich carbon nitride, one of the most investigated photocatalysts reported in literature for ammonia generation, is combined with earth-abundant and bioinspired FeS2 to improve the activity for ammonia production. By this combination, an activity enhancement of ≈400% compared to unmodified carbon nitride is achieved. The optimal FeS2 loading is established to be 1 wt%, with ammonia yields of up to 800 µg L−1 after irradiation for 7 h. By detailed material characterization of the electronic and material properties of the composites before and after the photocatalytic reaction, it is revealed that NH3 generation occurs not photocatalytically from N2, but via a light-induced reduction of N–CN groups adjacent to nitrogen vacancies in the structure of defect-rich carbon nitride. FeS2 acts similar to a cocatalyst, enhancing the ammonia yield by π-back-donation from Fe-centers to the imine nitrogen of the defect-rich carbon nitride, thereby activating the structure and boosting the ammonia generation from cyano groups.
Further data
| Item Type: | Article in a journal |
|---|---|
| Keywords: | ammonia; carbon nitride; nitrogen reduction; photocatalysis; pyrite |
| DDC Subjects: | 500 Science > 540 Chemistry |
| Institutions of the University: | Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences |
| Language: | English |
| Originates at UBT: | Yes |
| URN: | urn:nbn:de:bvb:703-epub-7116-2 |
| Date Deposited: | 18 Jul 2023 09:35 |
| Last Modified: | 18 Jul 2023 09:36 |
| URI: | https://epub.uni-bayreuth.de/id/eprint/7116 |
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