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Updated: Jul 4, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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Published on: December 6, 2021

Vínculos múltiples metal-nitrógeno que aumentan sinérgicamente la actividad y la durabilidad de los

Xueru Zhao¹, Hao Cheng², Xiaobo Chen³

¹Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, United States.

Journal of the American Chemical Society

|January 26, 2024

Resumen

Este estudio introduce un nuevo catalizador de aleación de alta entropía dopado con nitrógeno para pilas de combustible. El catalizador exhibe una actividad y estabilidad superiores para la reacción de reducción de oxígeno (ORR), superando las opciones comerciales.

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Catálisis

Sus antecedentes:

El desarrollo de catalizadores eficientes y estables basados en platino para pilas de combustible es crucial pero desafiante.
Los catalizadores actuales a menudo se enfrentan a limitaciones en actividad, durabilidad y costo.

Objetivo del estudio:

Diseñar y evaluar un nuevo electrocatalizador de aleación de alta entropía (HEA) dopado con nitrógeno para mejorar el rendimiento de la reacción de reducción de oxígeno (ORR).
Investigar la relación estructura-actividad y la estabilidad del nuevo catalizador.

Principales métodos:

Síntesis de una carcasa rica en Pt dopada con nitrógeno y un núcleo de PtCoFeNiCu como catalizador de HEA en un soporte de carbono (N-Pt/HEA/C).
Pruebas electroquímicas mediante electrodo de disco giratorio (RDE) y conjunto de electrodos de membrana (MEA).
Caracterización mediante espectroscopia de absorción de rayos X operando y cálculos teóricos.

Principales resultados:

El catalizador N-Pt/HEA/C logró una alta actividad de masa de 1,34 A mg_Pt^-1 a 0,9 V para ORR, superando significativamente el Pt/C comercial y otros catalizadores basados en Pt.
Demostró una excelente estabilidad tanto en las pruebas de RDE como en las de MEA.
Energía de adsorción optimizada por N-doping y estructura electrónica personalizada, mejorando la actividad ORR.

Conclusiones:

El catalizador N-Pt/HEA/C ofrece una vía prometedora para los electrocatalizadores avanzados de pila de combustible.
Los efectos sinérgicos del dopaje de nitrógeno y la estructura de la HEA mejoran el rendimiento y la durabilidad de la ORR.
La estructura electrónica optimizada y los enlaces metal-nitrógeno contribuyen a una mayor actividad catalítica y resistencia a la corrosión.

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