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Pt-single atom decorated TiO2: Tuning anodic TiO2 nanotube structure and geometry toward a high-performance photocatalytic H2 production
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DOI：10.1016/j.electacta.2023.142081.png)
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Abstract
En 中文
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 mu m as well as their crystalline state by thermal annealing over a wide range of tem-peratures (350 degrees C - 800 degrees 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 gen-eration performance for the different NT layers under UV and solar illumination. The highest photocatalytic performance is achieved for 15-18 mu m long anatase NTs decorated with Pt SAs from a 0.01 mM H2PtCl6 solution (leading to a Pt SA surface concentration of 5.6 x 105 /mu m2). 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.
Keywords:
Pt single atoms
TiO2 nanotube
TiO2 structure
TiO2 geometry
PhotocatalyticH2 generation
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