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TiO2-supported Pt single atoms by surface organometallic chemistry for photocatalytic hydrogen evolution

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Abstract

A platinum complex, (CH3)2Pt(COD), is grafted via surface organometallic chemistry (SOMC) on morphology-controlled anatase TiO2 to generate single, isolated Pt atoms on TiO2 nano-platelets. The resulting material is characterized by FT-IR, high resolution scanning transmission electron microscopy (HRSTEM), NMR, and XAS, and then used to perform photocatalytic water splitting. The photocatalyst with SOMC-grafted Pt shows superior performance in photocatalytic hydrogen evolution and strongly suppresses the backwards reaction of H2 and O2 forming H2O under dark conditions, compared to the photocatalyst prepared by impregnation at the same Pt loading. However, single Pt atoms on this surface also rapidly coalesce into nanoparticles under photocatalytic conditions. It is also found that adsorption of CO gas at room temperature also triggers the aggregation of Pt single atoms into nanoparticles. A detailed mechanism is investigated for the mobility of Pt in the formation of its carbonyls using density functional theory (DFT) calculations.

Graphical abstract: TiO2-supported Pt single atoms by surface organometallic chemistry for photocatalytic hydrogen evolution

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Publication details

The article was received on 12 Aug 2019, accepted on 23 Oct 2019 and first published on 24 Oct 2019


Article type: Paper
DOI: 10.1039/C9CP04470A
Phys. Chem. Chem. Phys., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    TiO2-supported Pt single atoms by surface organometallic chemistry for photocatalytic hydrogen evolution

    G. Jeantelot, M. Qureshi, M. Harb, S. Ould-Chikh, D. H. Anjum, E. Abou-Hamad, A. Aguilar-Tapia, J. Hazemann, K. Takanabe and J. Basset, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP04470A

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