As a single atom Pd outperforms Pt as the most active co-catalyst for photocatalytic H-2 evolution
| Autor: | Gihoon Cha, Igor A. Pašti, Štěpán Kment, Tadahiro Yokosawa, Erdmann Spiecker, Anca Mazare, Natalia V. Skorodumova, Imgon Hwang, Seyedsina Hejazi, Benedict Osuagwu, Johannes Will, Shiva Mohajernia, Zdeněk Bad'ura, Patrik Schmuki, Hyesung Kim, Ana S. Dobrota |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Anatase
Annan kemi Materials science Science Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Catalysis Nanomaterials Atom Multidisciplinary Materials characterization 021001 nanoscience & nanotechnology 0104 chemical sciences engineering Photocatalysis Physical chemistry Noble metal Density functional theory 0210 nano-technology Other Chemistry Topics |
| Zdroj: | iScience, Vol 24, Iss 8, Pp 102938-(2021) |
| Popis: | Summary Here, we evaluate three different noble metal co-catalysts (Pd, Pt, and Au) that are present as single atoms (SAs) on the classic benchmark photocatalyst, TiO2. To trap the single atoms on the surface, we introduced controlled surface vacancies (Ti3+-Ov) on anatase TiO2 nanosheets by a thermal reduction treatment. After anchoring identical loadings of single atoms of Pd, Pt, and Au, we measure the photocatalytic H2 generation rate and compare it to the classic nanoparticle co-catalysts on the nanosheets. While nanoparticles yield the well-established the hydrogen evolution reaction activity sequence (Pt > Pd > Au), for the single atom form, Pd radically outperforms Pt and Au. Based on density functional theory (DFT), we ascribe this unusual photocatalytic co-catalyst sequence to the nature of the charge localization on the noble metal SAs embedded in the TiO2 surface. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|