4.8 Letter

Enhancing the Supply of Activated Hydrogen to Promote Photocatalytic Nitrogen Fixation

Journal

ACS MATERIALS LETTERS
Volume 3, Issue 11, Pages 1521-1527

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.1c00504

Keywords

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Funding

  1. National Key Projects for Fundamental Research and Development of China [2018YFB1502002]
  2. National Natural Science Foundation of China [51825205, 51772305, 52120105002, 21902168, 52072382]
  3. Beijing Natural Science Foundation [2191002]
  4. DNL Cooperation Fund, CAS [DNL202016]
  5. China Postdoctoral Science Foundation [BX2021323]
  6. Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17000000]
  7. Royal Society-Newton Advanced Fellowship [NA170422]
  8. International Partnership Program of the Chinese Academy of Sciences [GJHZ201974]
  9. Youth Innovation Promotion Association of the CAS

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The strategy of utilizing Pt-doped Ag nanoparticles supported on TiO2 to improve the supply of activated hydrogen for promoting photocatalytic N-2 fixation has successfully increased NH3 yield, and can be applied to other efficient catalysts for nitrogen fixation.
Photocatalytic nitrogen fixation using water as a hydrogen source has proved a green avenue for ammonia synthesis, yet most ammonia yields reported to date are far from industrial demand. One of the bottlenecks lying in the surface catalytic process involves the acquisition and utilization of activated hydrogen (H*). Herein, a strategy regarding ameliorative H* supply for promoting photocatalytic N-2 fixation was realized by utilizing the Pt-doped Ag nanoparticles supported on TiO2 (AgPt-TiO2). Irradiation of AgPt-TiO2 in N-2-saturated water produced NH3 at a rate of 38.4 mu mol g(-1) h(-1), which has a 7.7-fold increase compared with the value for pristine TiO2. The dramatically enhanced activity of AgPt-TiO2 results from the sufficient H* supply, thereby boosting significantly N-2 hydrogenation and promoting ammonia formation. The promising strategy adopted here could be employed to regulate and acquire activated hydrogen of other efficient photocatalysts for N-2 fixation and other photocatalytic reactions (e.g., CO2 conversion and hydrogen peroxide production).

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