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La nano plancha PtPb/Pt con tensión biaxial aumenta la catálisis de reducción de oxígeno

Lingzheng Bu¹, Nan Zhang¹, Shaojun Guo^2,3,4

¹College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu 215123, China.

Science (New York, N.Y.)

|December 17, 2016

Resumen

Las nanoplacas de plomo y platino con cepas de tracción aumentan significativamente la actividad de la reacción de reducción de oxígeno. Estos catalizadores duraderos muestran un excelente rendimiento y estabilidad durante 50.000 ciclos.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Catálisis

Sus antecedentes:

Las cepas superficiales de compresión mejoran la actividad de la reacción de reducción de oxígeno (ORR) en los catalizadores M/platino (Pt) de núcleo/capa.
La optimización de la actividad ORR es crucial para aplicaciones electroquímicas como las pilas de combustible.

Objetivo del estudio:

Desarrollar y caracterizar nuevos catalizadores de nanoplacas con núcleo de plomo y platino (PtPb/Pt).
Investigar el impacto de las tensiones biaxiales en la actividad de la ORR y la estabilidad del catalizador.

Principales métodos:

Síntesis de nanoplacas de núcleo y cáscara de PtPb/Pt.
Caracterización electroquímica de la actividad ORR (actividad específica y de masa).
Cálculos de la teoría funcional de la densidad (DFT) para analizar las deformaciones superficiales y la unión.

Principales resultados:

Las nanoplacas PtPb/Pt muestran una alta actividad específica ORR (7,8 mA/cm2) y una actividad de masa (4,3 A/mg Pt) a 0,9 V frente a RHE.
Los cálculos de DFT muestran que las deformaciones por tracción en las facetas Pt (110) optimizan la resistencia al enlace Pt-O.
Los catalizadores demuestran una estabilidad excepcional, soportando 50.000 ciclos de voltaje sin deterioro significativo de la actividad o cambios estructurales.

Conclusiones:

Los nanoplacas PtPb/Pt de núcleo/capa con cepas de tracción son catalizadores ORR muy efectivos.
El núcleo intermetálico y la carcasa Pt uniforme contribuyen a una resistencia superior del catalizador.
Estos hallazgos ofrecen una vía prometedora para el desarrollo de electrocatalizadores avanzados.

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