Catalysis B: MXene assists photocatalytic synthesis of NH3

Ti 3 C 2  MXenes is a new type of two-dimensional layered material, due to its large surface area, two-dimensional layered structure, large capacitance, excellent electrical conductivity, and effective chemical adsorption of N 2 molecules / Activation, has been successfully used as a new and highly efficient co-catalyst to improve the synthesis performance of P25 photocatalytic NH 3 .

Achievements

     Recently, Northwestern University ‘s Hai-Ying Jiang ProfessorwithProfessor Junwang Tang of University College London published a paper titled " 2D-layered Ti 3 C 2  MXenes for Promoted Synthesis of NH 3  on P25 Photocatalysts " in the top international journal Applied Catalysis B: Environmental . In the light under ,pureP25compared,. 6% of Ti . 3 C 2  MXenes-P25optimization sample isNH2 . 3 yield increased5-fold, consistent with the measured photocurrent density and lifetime of the charge. Further mechanical studies have shown thatTi 3 C 2 plays an important role in the separation of photogenerated electron-hole pairs and can accumulate electrons excitedfrom the excitedP25. Most importantly, according toESRSpectrum and DFT calculation, Ti 3 C 2 can significantly improve the chemical adsorption and activity of N 2 . Furthermore, the load on P25 on of Ti . 3 C 2  MXenes may P25 introduction of oxygen vacancies, it is also beneficial to photocatalytic NH2 . 3 synthesis. Therefore, this study provides an efficient and promising cocatalyst for the process of photocatalytic synthesis of NH 3 from N 2 in air .

FIG  . 1  of Ti . 3 C 2  MXenes-P25 morphology.

Figure  2 Structure of  Ti 3 C 2  MXenes-P25 .

Figure  3   Yield of different NH 3 synthesized from Ti 3 C 2 MXenes-P25 .

Figure  4  The yield of NH 3 synthesized by Ti 3 C 2  MXenes-P25 when water and methanol are H sources .

Figure  5  Photocurrent response of Ti 3 C 2  MXenes-P25 .

Figure  6  tablet model.

Figure  7  Ti 3 C 2  MXenes-P25 synthesis NH 3 mechanism diagram.

in conclusion

      In summary, Ti 3 C 2  MXene has been successfully used as a new co-catalyst for the synthesis of NH 3 . In the light of Ti . 3 C 2  MXenes of P25 prepared NH2 . 3 has a role in promoting efficient. Among them, the 6% Ti 3 C 2  MXenes-P25 sample has the highest photocatalytic activity. Ti 3 C 2  MXenes introduced doped oxygen vacancies in P25 , which not only weakened the recombination of excited electron-hole pairs, but also promoted the adsorption of N 2 by the photocatalyst . This work provides an efficient and promising cocatalyst for the photocatalytic synthesis of NH 3 from N 2 in the air .

Original link:

https://www.sciencedirect.com/science/article/abs/pii/S0926337320304690

Source: MXene Academic