4.7 Article

Photocatalytic NH3 Splitting on TiO2 Particles Decorated with Pt-Au Bimetallic Alloy Nanoparticles

Journal

ACS APPLIED NANO MATERIALS
Volume 3, Issue 2, Pages 1612-1620

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b02380

Keywords

photocatalyst; ammonia; hydrogen; cocatalyst; alloy; nanoparticles

Funding

  1. Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [19H02516]
  2. Grants-in-Aid for Scientific Research [19H02516] Funding Source: KAKEN

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Photocatalytic splitting of aqueous NH3 into H-2 and N-2 on semiconductor powders is an important reaction toward on-site production of H-2 from NH3, a promising hydrogen carrier for sustainable energy society. Earlier reports revealed that TiO2 loaded with Pt nanoparticles (Pt/TiO2) is the most effective catalyst for this reaction. Herein, we report that TiO2 loaded with homogeneously mixed bimetallic alloy nanoparticles containing 90 mol % Pt and 10 mol % Au (Pt0.9Au0.1/TiO2) promotes photocatalytic NH3 splitting very efficiently. Electrochemical analysis indicates that Au alloying to Pt lowers the height of Schottky barrier created at the metal/TiO2 interface. This promotes efficient transfer of conduction band electrons on TiO2 to metal particles. This results in enhanced separation of the photogenerated charges, thus promoting efficient NH3 splitting.

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