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Nanocables de cobre recubiertos de platino con alta actividad para la reacción de oxidación de hidrógeno en la base

Shaun M Alia¹, Bryan S Pivovar, Yushan Yan

¹Department of Chemical and Biomolecular Engineering, University of Delaware , Newark, Delaware 19716, United States.

Journal of the American Chemical Society

|August 20, 2013

Resumen

Los nanocables de cobre recubiertos de platino demuestran una catálisis mejorada de la reacción de oxidación de hidrógeno (HOR) en medios alcalinos. Estos nuevos Pt / CuNW muestran una actividad superior en comparación con los catalizadores de platino tradicionales.

Área de la Ciencia:

La electroquímica es electroquímica.
Ciencia de los materiales Ciencia de los materiales.
Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

La reacción de oxidación de hidrógeno (HOR) es crucial para las pilas de combustible.
El desarrollo de catalizadores eficientes y rentables es esencial.
Los catalizadores basados en platino son efectivos pero caros.

Objetivo del estudio:

Para sintetizar y evaluar los nanocables de cobre recubiertos de platino (Pt / CuNWs) como catalizadores HOR.
Para comparar el rendimiento de Pt/CuNWs con otros catalizadores de platino.
Comprender el papel del cobre en la mejora de la actividad catalítica.

Principales métodos:

Síntesis de Pt/CuNWs a través del desplazamiento galvánico parcial de nanocables de cobre.
Pruebas electroquímicas de Pt/CuNWs y otros catalizadores (PtNT(Cu), 5% ML Cu/BPPt, BPPt, Pt/C) en solución alcalina.
Análisis de la actividad HOR utilizando densidades de corriente de intercambio de área y masa.

Principales resultados:

Pt/CuNWs exhibieron una actividad HOR significativamente mayor en comparación con Pt/C.
Pt/CuNWs mostraron 3,5 veces mayor densidad de corriente de intercambio de área y 1,9 veces mayor densidad de corriente de intercambio de masa que Pt/C.
La inclusión de cobre, a través de efectos de deformación y superficie, benefició la actividad HOR del platino.

Conclusiones:

Los Pt/CuNW son prometedores electrocatalizadores para la reacción de oxidación de hidrógeno en medios alcalinos.
La presencia de cobre en Pt/CuNWs mejora el rendimiento catalítico.
Los Pt/CuNW ofrecen una alternativa potencialmente más rentable a los catalizadores convencionales de platino.

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