Monolithic metal-containing TiO2 aerogels assembled from crystalline pre-formed nanoparticles as efficient photocatalysts for H2 generation
Abstract
Nanoparticle-based aerogels are 3-dimensional (3D) assemblies of macroscopic size that maintain the intrinsic properties of the initial nanoparticles. Accordingly, they bear immense potential to become an emerging platform for designing new and efficient photocatalysts. However, to take full advantage of this strategy, understanding of the multiscale processes occurring in such 3D-architectures is essential. Here, we prepared aerogels by co-assembling spherical Au, Pd, and PdAu with TiO2 nanoparticles and investigated their photocatalytic properties for hydrogen generation. During gelation, the anatase nanoparticles undergo oriented attachment, homogeneously entrapping the metal nanoparticles in the growing network. The aerogels offer a high porosity with a mean pore size of ca. 34 nm and a large surface area of about 450 m2 g−1. The porous structure enhances the light-harvesting, reagent transport, and electron migration process, generating 3.5-fold more hydrogen in comparison to the corresponding powders. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000400887Publication status
publishedExternal links
Journal / series
Applied Catalysis B: EnvironmentalVolume
Pages / Article No.
Publisher
ElsevierSubject
Photocatalytic H2 production; Nanoparticle assembly; Monolithic photocatalysts; TRMC; PdAu-TiO2Organisational unit
03763 - Niederberger, Markus / Niederberger, Markus
Funding
165888 - Tailored synthesis of nanoparticle-based aerogel monoliths and their use in gas phase reactions (SNF)
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