Optimized Pt Single Atom Harvesting on TiO2 Nanotubes—Towards a Most Efficient Photocatalyst

Wu Z, Hwang I, Cha G, Qin S, Tomanec O, Badura Z, Kment S, Zboril R, Schmuki P (2021)

Publication Type: Journal article

Publication year: 2021

Journal

DOI: 10.1002/smll.202104892

Abstract

In the present work the authors show that anodic TiO2 nanotubes (NT) show excellent harvesting properties for Pt single atoms (Pt SAs) from highly dilute Pt solutions. The tube walls of anodic nanotubes, after adequate annealing to anatase, provide ample of suitable trapping sites—that is, surface Ti³⁺-Ov (Ov: oxygen vacancy) defects that are highly effective to extract and accumulate Pt in the form of SAs. A saturated (maximized) SA density can be achieved by an overnight immersion of a TiO2 NT layer to a H2PtCl6 solution with a concentration that is as low as 0.01 mm Pt. Such TiO2 NTs with surface trapped Pt SAs provide a maximized high activity for photocatalytic H2 generation (reaching a turnover frequency (TOF) of 1.24 × 10⁶ h⁻¹ at a density of 1.4 × 10⁵ Pt atoms µm⁻²)—a higher loading with Pt nanoparticles does not further increase the photocatalytic activity. Overall, these findings show that anodic TiO2 nanotubes provide a remarkable substrate for Pt extraction and recovery from very dilute solutions that directly results in a highly efficient photocatalyst, fabricated by a simple immersion technique.

Authors with CRIS profile

Involved external institutions

Palacky University Olomouc / Univerzita Palackého v Olomouci Czech Republic (CZ)

How to cite

APA:

Wu, Z., Hwang, I., Cha, G., Qin, S., Tomanec, O., Badura, Z.,... Schmuki, P. (2021). Optimized Pt Single Atom Harvesting on TiO2 Nanotubes—Towards a Most Efficient Photocatalyst. Small. https://dx.doi.org/10.1002/smll.202104892

MLA:

Wu, Zhenni, et al. "Optimized Pt Single Atom Harvesting on TiO2 Nanotubes—Towards a Most Efficient Photocatalyst." Small (2021).

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