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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
Pt5Gd como un catalizador altamente activo y estable para la electrorreducción de oxígeno.
María Escudero-Escribano1, Arnau Verdaguer-Casadevall, Paolo Malacrida
1Center for Individual Nanoparticle Functionality, Department of Physics, Building 312, Technical University of Denmark (DTU), DK-2800 Lyngby, Denmark.
Journal of the American Chemical Society
|September 25, 2012
Resumen
Los catalizadores de platino-gadolinio (Pt(5) Gd muestran un aumento de cinco veces en la actividad de la reacción de reducción de oxígeno (ORR) en comparación con el platino puro. Esta mayor actividad, atribuida a la tensión de compresión, hace de Pt(5) Gd un material prometedor para los catalizadores de pilas de combustible.
Área de la Ciencia:
- La electroquímica es electroquímica.
- Ciencia de los materiales Ciencia de los materiales.
- La catálisis de la catálisis.
Sus antecedentes:
- El desarrollo de electrocatalizadores eficientes es crucial para el avance de la tecnología de pilas de combustible.
- Las aleaciones a base de platino se investigan ampliamente para la catálisis de la reacción de reducción de oxígeno (ORR).
Objetivo del estudio:
- Investigar la actividad y estabilidad del platino-gadolinio (Pt(5) Gd para la reacción de reducción de oxígeno (ORR).
- Para aclarar los mecanismos detrás de la mejora del rendimiento catalítico de Pt(5) Gd.
Principales métodos:
- Las mediciones electroquímicas.
- Espectroscopia de fotoelectrones de rayos X con resolución de ángulo (AR-XPS)
- Teoría funcional de la densidad (DFT) cálculos.
Principales resultados:
- Pt(5)Gd limpiado con pulverización exhibió un aumento de 5 veces en la actividad ORR en comparación con Pt puro a 0.9 V.
- AR-XPS reveló la formación de una capa superior de platino en Pt(5) Gd después de las pruebas electroquímicas.
- La mayor actividad se atribuye a los efectos de tensión de compresión dentro de la estructura del catalizador.
Conclusiones:
- Pt(5)Gd demuestra una actividad ORR significativamente mejorada y una alta estabilidad.
- Estos electrocatalizadores bimetálicos muestran una gran promesa para futuras aplicaciones de cátodo de pila de combustible.
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