Hydrogen Treatment as Potential Protection of Electrodeposited Pt, Au, and Pt/Au Oxygen Reduction Catalysts on TiOx
| Autor: | Naoko Takahashi, Sebastian Proch, Satoru Kosaka, Shuhei Yoshino, Juntaro Seki, Yu Morimoto, Kensaku Kodama, Yuji Kamitaka |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Catalyst support Oxide chemistry.chemical_element Sintering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Overlayer chemistry.chemical_compound chemistry Chemical engineering Electrochemistry 0210 nano-technology Platinum Dissolution Titanium |
| Zdroj: | Electrocatalysis. 10:1-16 |
| ISSN: | 1868-5994 1868-2529 |
| Popis: | Methods of protecting Pt(-alloy) particles against dissolution during fuel cell operation have recently gathered attention. Titania as a promising Pt catalyst support has its own built-in protection mechanism, called strong metal-support interaction (SMSI), which leads to encapsulation of metal particles. A high-coverage Pt particle film (approximated layer) with high oxygen reduction activity on the native oxide of metallic titanium has been heat treated in a hydrogen atmosphere. This treatment gave rise to its protection with a thin TiOx layer while Pt particle sintering or the destruction of the Pt structure was avoided. This unique behavior might originate from the structure of this approximate layer; i.e., contiguous patches of TiOx allow fast SMSI/encapsulation of the whole Pt structure before massive sintering or destruction can take place. Although the film was found to be covered by a 5.0 ± 0.1-nm TiOx overlayer, oxygen reduction with a mass activity of 26 ± 4 A gPt−1 could still be observed. |
| Databáze: | OpenAIRE |
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