Understanding Oxygen Activation on Metal- and Nitrogen-Codoped Carbon Catalysts
| Autor: | Thierry K. Slot, David Eisenberg, Gadi Rothenberg |
|---|---|
| Přispěvatelé: | HCSC+ (HIMS, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Chemistry
Inorganic chemistry 02 engineering and technology General Chemistry Porosimetry 010402 general chemistry 021001 nanoscience & nanotechnology Heterogeneous catalysis Electrocatalyst 01 natural sciences Catalysis 0104 chemical sciences Metal X-ray photoelectron spectroscopy visual_art visual_art.visual_art_medium Reactivity (chemistry) Temperature-programmed reduction 0210 nano-technology |
| Zdroj: | ACS Catalysis, 8(9), 8618-8629. American Chemical Society |
| ISSN: | 2155-5435 |
| DOI: | 10.1021/acscatal.8b01045 |
| Popis: | Multidoped carbons are often used for oxygen activation catalysis, both in heterogeneous catalysis and electrocatalysis. Identifying their catalytic sites is crucial for developing better catalysts. We now report an in-depth study into O2 activation on an important class of materials: carbons codoped by nitrogen and 10 different metals (V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, and Pb). To identify catalytic sites, we studied their composition and structure (both bulk and surface) by a wide range of techniques, including temperature-programmed reduction, X-ray diffraction, electron microscopy, X-ray photoelectron spectroscopy, and N2 sorption porosimetry. The O2 activation step was studied by electrochemical oxygen reduction. To assign active sites, the electrocatalytic activity, selectivity, and stability were correlated to material composition and to known reactivity pathways. Two types of sites for O2 activation were identified and assigned for each multidoped material: (1) particles of partially reduced metal oxides and (2) metal–nitrogen clusters embedded into the carbon matrix. The detailed assignment correlates to activity in alcohol oxidation through similar volcano plots and leads to practical suggestions for catalyst development. |
| Databáze: | OpenAIRE |
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