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Pt Single Atoms on TiO 2 Polymorphs—Minimum Loading with a Maximized Photocatalytic Efficiency

Qin, Shanshan; Denisov, Nikita; Sarma, Bidyut Bikash 1,2; Hwang, Imgon; Doronkin, Dmitry E. ORCID iD icon 1,2; Tomanec, Ondrej; Kment, Stepan; Schmuki, Patrik
1 Institut für Katalyseforschung und -technologie (IKFT), Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)

Abstract:

For more than 20 years, Pt/TiO$_2$ represents the benchmark photocatalyst/co-catalyst platform for photocatalytic hydrogen (H$_2$) generation. Here, single atom (SA) Pt is decorated on different polymorphs of TiO$_2$ (anatase, rutile, and the mixed phase of P25) using a simple immersion anchoring approach. On P25 and anatase, Pt SAs act as highly effective co-catalyst for pure water splitting with a photocatalytic H$_2$ evolution activity (4600 µmol h$^{−1}$ g$^{−1}$)—on both polymorphs, SA deposition yields a significantly more active photocatalyst than those decorated with classic Pt nanoparticles or conventional SA deposition approaches. On rutile, Pt SAs provide hardly any co-catalytic effect. Most remarkable, for P25, the loading of Pt SAs from precursor solution with a very low concentration (<1 ppm Pt) leads already to a maximized co-catalytic effect. This optimized efficiency is obtained at 5.3 × 10$^{5}$ atoms µm$^{−2}$ (at macroscopic loading of 0.06 at%)—for a higher concentration of Pt (a higher density of SAs), the co-catalytic efficiency is significantly reduced due to H$_2$/O$_2$ recombination. The interactions of the SA Pt with the different polymorphs that lead to this high co-catalytic activity of SA Pt at such low concentrations are further discussed.


Verlagsausgabe §
DOI: 10.5445/IR/1000148717
Veröffentlicht am 15.07.2022
Originalveröffentlichung
DOI: 10.1002/admi.202200808
Scopus
Zitationen: 17
Web of Science
Zitationen: 13
Dimensions
Zitationen: 19
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 03.08.2022
Sprache Englisch
Identifikator ISSN: 2196-7350
KITopen-ID: 1000148717
HGF-Programm 38.03.02 (POF IV, LK 01) Power-based Fuels and Chemicals
Erschienen in Advanced Materials Interfaces
Verlag John Wiley and Sons
Band 9
Heft 22
Seiten Art.-Nr.: 2200808
Vorab online veröffentlicht am 01.07.2022
Nachgewiesen in Web of Science
Dimensions
Scopus
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