Liao, Y;
Qian, J;
Xie, G;
Han, Q;
Dang, W;
Wang, Y;
Lv, L;
... Tang, J; + view all
(2020)
2D-layered Ti₃C₂ MXenes for promoted synthesis of NH₃ on P25 photocatalysts.
Applied Catalysis B: Environmental
, 273
, Article 119054. 10.1016/j.apcatb.2020.119054.
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Abstract
A kind of 2D-layered material, Ti3C2 MXenes, was successfully used as a new and efficient co-catalyst to improve the photocatalytic NH3 synthesis performance of P25, due to its large surface area/2D-layered structure, large electric capacity, excellent electrical conductivity and effective chemisorption/activation of N2 molecules. The generation yield of NH3 was improved by five times on the optimized sample of 6% Ti3C2 MXenes–P25 compared with pure P25 under full spectrum light irradiation, consistent with the measured both photocurrent densities and charge lifetime. The further mechanistic study showed that Ti3C2 MXenes played an important role in the separation of photogenerated electron–hole pairs by accumulating the excited electrons from the excited P25. Most importantly, Ti3C2 MXenes could dramatically improve chemisorption and activation of N2 as demonstrated by ESR spectra and DFT calculations. In addition, Ti3C2 MXenes loading on P25 could introduce oxygen vacancies in P25, also beneficial for photocatalytic NH3 synthesis. Thus this study provides an efficient and promising co-catalyst for the photocatalytic NH3 synthesis process from N2 in air.
| Type: | Article |
|---|---|
| Title: | 2D-layered Ti₃C₂ MXenes for promoted synthesis of NH₃ on P25 photocatalysts |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.apcatb.2020.119054 |
| Publisher version: | https://doi.org/10.1016/j.apcatb.2020.119054 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | NH3 synthesis, Photocatalysis, P25, Ti3C2 MXenes, Co-catalyst |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10098802 |
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