Disordered-Layer-Mediated Reverse Metal–Oxide Interactions for Enhanced Photocatalytic Water Splitting
| Autor: | Kug-Seung Lee, Ismail A.M. Ibrahim, Deepak Kumar Padhi, Kwang Hee Kim, Jong Hyeok Park, Jeong Woo Han, Chang-Lyoul Lee, Sung Soon Kim, Bumsu Park, Sang Ho Oh, Yoonjun Cho |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Oxide Metal Nanoparticles Bioengineering 02 engineering and technology Heterogeneous catalysis Catalysis Metal chemistry.chemical_compound General Materials Science Hydrogen production Titanium Valence (chemistry) Mechanical Engineering Electron energy loss spectroscopy Water Oxides General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Chemical engineering chemistry visual_art visual_art.visual_art_medium 0210 nano-technology Photocatalytic water splitting |
| Zdroj: | Nano Letters. 21:5247-5253 |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | In heterogeneous catalysts, metal-oxide interactions occur spontaneously but often in an undesired way leading to the oxidation of metal nanoparticles. Manipulating such interactions to produce highly active surface of metal nanoparticles can warrant the optimal catalytic activity but has not been established to date. Here we report that a prior reduced TiO2 support can reverse the interaction with Pt nanoparticles and augment the metallic state of Pt, exhibiting a 3-fold increase in hydrogen production rate compared to that of conventional Pt/TiO2. Spatially resolved electron energy loss spectroscopy of the Ti valence state and the electron density distribution within Pt nanoparticles provide direct evidence supporting that the Pt/TiO2/H2O triple junctions are the most active catalytic sites for water reduction. Our reverse metal-oxide interaction scheme provides a breakthrough in the stagnated hydrogen production efficiency and can be applied to other heterogeneous catalyst systems composed of metal nanoparticles with reducible oxide supports. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|