Selective Chlorine Evolution Catalysts Based on Mg-Doped Nanoparticulate Ruthenium Dioxide
| Autor: | Maki Okube, Petr Krtil, Zdenk Bastl, Daniel F. Abbott, Valery Petrykin, Sanjeev Mukerjee |
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| Rok vydání: | 2014 |
| Předmět: |
Extended X-ray absorption fine structure
Renewable Energy Sustainability and the Environment Magnesium Inorganic chemistry Oxide Oxygen evolution chemistry.chemical_element Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis chemistry.chemical_compound chemistry Rutile Materials Chemistry Electrochemistry Chlorine Magnesium ion |
| Zdroj: | Journal of The Electrochemical Society. 162:H23-H31 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/2.0541501jes |
| Popis: | Nanocrystalline Mg-doped ruthenium dioxide catalysts with the formula Ru1-xMgxO2 (0 ≤ x ≤ 20) were synthesized by the spray-freezing freeze-drying technique. Synthesized materials are of nanoparticulate nature and show a single phase diffraction pattern conforming to a tetragonal oxide of the rutile structural type. Magnesium ions are not distributed homogeneously in the material, but exist in Mg-rich clusters as shown by X-ray absorption spectroscopy. The refinement of the Mg EXAFS functions for materials with low Mg content shows that the magnesium rich clusters contain Mg in a highly strained environment similar to that of the rutile-type structure. The Mg environment shifts to an ilmenite-type inclusion when Mg occupies more than 10% of all cationic positions. All Mg modified materials are active in oxygen evolution and chlorine evolution reactions. Although the Mg containing catalysts show lower overall activities compared with the non-doped ruthenia, they feature enhanced selectivity toward the chlorine evolution process, which is attributed primarily to the opening of a reaction pathway for chlorine evolution associated with presence of Mg modified active sites. |
| Databáze: | OpenAIRE |
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