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Síntesis de nanocristales de platino tetrahexaédricos con facetas de alto índice y alta actividad de electrooxidación
Na Tian1, Zhi-You Zhou, Shi-Gang Sun
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Se sintetizaron nanocristales de platino con una forma tetrahexaédrica única. Estas nuevas formas exhiben una actividad catalítica significativamente mejorada para la electro-oxidación del combustible.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La electroquímica es electroquímica.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los nanocristales de metales nobles (NC) suelen adoptar formas definidas por las facetas {111} y {100}.
- Las formas comunes incluyen cubos, tetraedros y octaedros.
Objetivo del estudio:
- Para sintetizar nanocristales de platino (NCs) con una inusual forma tetrahexáedrica (THH).
- Investigar las propiedades catalíticas de estos THH NC para la electrooxidación de pequeños combustibles orgánicos.
Principales métodos:
- Tratamiento electroquímico de nanosferas de platino apoyadas en carbono vidrioso utilizando un potencial de onda cuadrada.
- Caracterización de las NC THH monocristalinas resultantes.
Principales resultados:
- Síntesis de alto rendimiento de un solo cristal THH platino NCs.
- Los NC de THH están rodeados por 24 facetas de alto índice ({730}, {210}, {520}), con altas densidades de pasos atómicos y enlaces colgantes.
- Estas superficies demuestran una excelente estabilidad térmica (hasta 800°C) y estabilidad química.
- Actividad catalítica significativamente mejorada (hasta 400%) para la electrooxidación de ácido fórmico y etanol en comparación con las superficies equivalentes de Pt.
Conclusiones:
- Los CN de platino tetrahexáderos ofrecen una plataforma prometedora para la catálisis avanzada.
- Las facetas de alto índice de los NC de THH son clave para su rendimiento catalítico superior en la electrooxidación del combustible.
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