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El rutenio bien disperso en el cristal mesoporoso TiO2 como electrocatalista avanzado para la reacción de evolución

Shuying Nong¹, Wujie Dong¹, Junwen Yin²

¹State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , PR China.

Journal of the American Chemical Society

|April 13, 2018

Resumen

Este estudio introduce un nuevo método para crear cristales mesoporosos de dióxido de titanio (TiO2) dopados con rutenio. El material resultante exhibe una alta actividad para las reacciones electrocatalíticas de evolución del hidrógeno (HER).

Área de la Ciencia:

Ciencias de los materiales
Nanotecnología
Catálisis

Sus antecedentes:

El dióxido de titanio (TiO2) es un material versátil con aplicaciones en catálisis.
El desarrollo de electrocatalizadores eficientes para la reacción de evolución del hidrógeno (HER) es crucial para las tecnologías de energía limpia.

Objetivo del estudio:

Para sintetizar cristales mesoporosos de TiO2 dopados con rutenio (Ru) mediante un proceso de corrosión en un solo paso.
Investigar la estructura, el estado de dopaje y las propiedades electrocatalíticas del material sintetizado para HER.

Principales métodos:

Mecanismo de fijación orientado para la síntesis de cristales mesoporosos de TiO2.
Microscopía electrónica de transmisión de alta resolución (HRTEM) y adsorción-desorción de nitrógeno para la caracterización estructural.
Espectroscopia de fotoelectrones de rayos X (XPS) y resonancia paramagnética de electrones (EPR) para el análisis del estado elemental y de valencia.
Primeros cálculos de principios para simular el proceso HER y evaluar la actividad catalítica.

Principales resultados:

Se han preparado con éxito cristales mesoporosos de TiO2 con Ru bien disperso.
Se identificó rutenio pentavalente (Ru5+) y titanio trivalente (Ti3+) en la red de TiO2.
Se ha demostrado una alta actividad electrocatalítica para el HER en solución alcalina.
Las simulaciones computacionales confirmaron las energías libres de Gibbs (ΔGH) de adsorción de hidrógeno favorables para TiO2:Ru.

Conclusiones:

El nuevo método de síntesis produce TiO2 Ru-dopado con especies únicas de Ru5+ y Ti3+.
El material sintetizado exhibe un excelente rendimiento para la evolución del hidrógeno electrocatalítico.
Los hallazgos proporcionan información sobre el mecanismo de aumento de la actividad de HER en TiO2 dopado.

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