| Autor: |
Uribe, Francisco A., Garzon, Fernando H., Brosha, Eric L., Johnston, Christina M., Conradson, Steven D., Wilson, Mahion S. |
| Předmět: |
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| Zdroj: |
Journal of The Electrochemical Society; Nov2007, Vol. 154 Issue 11, pD623-D628, 6p, 5 Black and White Photographs, 1 Chart, 5 Graphs |
| Abstrakt: |
The use of the spontaneous deposition of metals onto surfaces is widespread in industry and research. Here, we report that metal hexaborides (e.g., LaB6, YB6, EuB6) spontaneously deposit noble metals from solution to form robust layers. We observed spontaneous deposition of noble metals from inorganic salts or acids onto a variety of hexaboride compounds. No pretreatment of the hexaboride is necessary, and noble metal depositions ranging from complete and highly uniform nanometer-scale layers to relatively heavy mirrorlike coatings are easily obtained. We find that the hexaborides both facilitate the formation of and sustain the electrocatalytic activity of nanolayer platinum depositions. To provide such activity and dispersion, the hexaboride supports appear to have unusual promotion and adhesion qualities, possibly due to their low work functions, which are 2-3 eV lower than the noble metals. This variety of unique material and process properties may have benefits in electrocatalysis, heterogeneous catalysis, electronic devices, and coatings. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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