Pt-single atom decorated TiO2: Tuning anodic TiO2 nanotube structure and geometry toward a high-performance photocatalytic H2 production

Chen X, Qin S, Denisov N, Kure-Chu SZ, Schmuki P (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Electrochimica Acta Elsevier

Book Volume: 446

Article Number: 142081

DOI: 10.1016/j.electacta.2023.142081

Abstract

Atomically dispersed Pt single atoms (SAs) on titania have been reported to be a highly effective co-catalyst in photocatalytic H2 generation. In this report, we grew layers of anodic TiO2 nanotubes (NTs) varying the lengths of the NTs from 1 to 18 μm as well as their crystalline state by thermal annealing over a wide range of temperatures (350 °C – 800 °C). We then decorated the nanotubes with single atom (SA) Pt co-catalysts deposited from H2PtCl6 solutions with various concentrations of 0.001–2 mM Pt and evaluate the photocatalytic H2 generation performance for the different NT layers under UV and solar illumination. The highest photocatalytic performance is achieved for 15–18 μm long anatase NTs decorated with Pt SAs from a 0.01 mM H2PtCl6 solution (leading to a Pt SA surface concentration of 5.6 × 105 /µm2). Except for a sufficient SA Pt loading and an anatase structure, the key parameter is the photon absorption length for near-band-gap UV and AM 1.5 light. Such optimized Pt SA@TiO2 NTs show a most efficient H2, outperforming many other photocatalytic 3D titania structures, such as titania-based powders, flakes, and Metal–Organic Frameworks (MOFs) tested under the same illumination conditions.

Authors with CRIS profile

Shanshan Qin Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik) (LKO) Nikita Denisov Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik) (LKO) Patrik Schmuki Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik) (LKO)

Additional Organisation(s)

Nanoanalysis and Electron Microscopy (CENEM) Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

Involved external institutions

Nagoya Institute of Technology / 名古屋工業大学 Nagoya Kōgyō Daigaku JP Japan (JP)

How to cite

APA:

Chen, X., Qin, S., Denisov, N., Kure-Chu, S.Z., & Schmuki, P. (2023). Pt-single atom decorated TiO2: Tuning anodic TiO2 nanotube structure and geometry toward a high-performance photocatalytic H2 production. Electrochimica Acta, 446. https://doi.org/10.1016/j.electacta.2023.142081

MLA:

Chen, Xuewen, et al. "Pt-single atom decorated TiO2: Tuning anodic TiO2 nanotube structure and geometry toward a high-performance photocatalytic H2 production." Electrochimica Acta 446 (2023).

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