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Mecanismo redóxido de oxígeno de enrejado de un solo átomo Ru para la oxidación mejorada del agua ácida

Menghui Qi¹, Xiangbowen Du¹, Xiaoyun Shi¹

¹Advanced Materials and Catalysis Group, Center of Chemistry for Frontier Technologies, State Key Laboratory of Clean Energy Utilization, Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China.

Journal of the American Chemical Society

|May 15, 2025

Resumen

Los electrocatalizadores de reacción de evolución de oxígeno (OER) altamente activos para los electrolizadores de agua de membrana de intercambio de protones (PEMWE) se desarrollaron utilizando átomos individuales de rutenio (Ru) confinados en el óxido de manganeso (MnO2). Este enfoque mejora la actividad y la durabilidad para una división eficiente del agua.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Catálisis

Sus antecedentes:

La activación del oxígeno aniónico redox es clave para el desarrollo de electrocatalizadores eficientes de reacción de evolución de oxígeno (OER).
Los electrolizadores de agua con membrana de intercambio de protones (PEMWE) requieren electrocatalizadores OER altamente activos y duraderos.

Objetivo del estudio:

Diseñar un nuevo electrocatalizador para mejorar la actividad y la estabilidad de los OER en PEMWE.
Investigar el mecanismo detrás del rendimiento catalítico mejorado.

Principales métodos:

Síntesis de átomos individuales de Ru confinados en celosía dispersos en el MnO2 lamelar.
Caracterización espectral in situ.
Cálculos de la teoría funcional de la densidad (DFT).

Principales resultados:

El enlace Ru-O desplazó la banda O2p, mejorando la covalencia metal-oxígeno y promoviendo la oxidación de la celosía.
La transferencia de electrones de Mn a Ru alivió el efecto Jahn-Teller, estabilizando la estructura octaédrica de MnO6.
El electrocatalizador Ru/MnO2 alcanzó un bajo sobrepotencial OER (179 mV a 10 mA cm-2) y una durabilidad excepcional (>1000 h a 100 mA cm-2).

Conclusiones:

El Ru/MnO2 de ingeniería exhibe una actividad y estabilidad OER superiores mediante la activación de redox aniónico de oxígeno y la estabilización de la red.
El catalizador desarrollado demuestra un excelente rendimiento en un dispositivo PEMWE, mostrando requisitos de bajo voltaje y durabilidad a largo plazo.

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