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El desdopaje activa el FeOOH para una oxidación electroquímica rentable y eficiente del agua

Shuai Niu^1,2, Wen-Jie Jiang^1,2, Zengxi Wei³

¹Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Molecular Nanostructure and Nanotechnology , Institute of Chemistry, Chinese Academy of Science Beijing 100190 , China.

Journal of the American Chemical Society

|April 2, 2019

Resumen

El dopaje de selenio aumenta significativamente los catalizadores de oxihidróxido de hierro (FeOOH) para la reacción de evolución del oxígeno (OER). Este avance ofrece una vía rentable hacia electrocatalizadores eficientes para la producción de hidrógeno limpio.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Catálisis

Sus antecedentes:

Los electrocatalizadores eficientes para la reacción de evolución del oxígeno (OER) generalmente dependen de níquel (Ni) o cobalto (Co) abundantes pero caros.
Los catalizadores basados en hierro (Fe), aunque son más baratos y más abundantes, generalmente muestran una actividad insuficiente para el OER.

Objetivo del estudio:

Investigar el efecto del dopaje de selenio (Se) en el oxihidróxido de hierro (FeOOH) para mejorar la actividad de OER.
Desarrollar un electrocatalizador basado en Fe rentable y eficiente para el REA y sus aplicaciones posteriores en la escisión de agua.

Principales métodos:

Se empleó una estrategia de activación electroquímica fácil en el sitio para crear electrodos FeOOH dopados con Se a partir de un precatalizador FeSe.
El análisis teórico y la validación experimental sistemática se utilizaron para confirmar el papel del Se-doping.
Se realizó una optimización de la estructura del electrodo para maximizar el rendimiento del OER.

Principales resultados:

El Se-doping promueve drásticamente la actividad OER en FeOOH, transformándolo en un electrocatalisador eficiente y de bajo costo.
Un electrodo FeOOH dopado con Se optimizado logró una densidad de corriente OER de nivel industrial de 500 mA cm-2 a un bajo sobrepotencial de 348 mV.
El electrodo OER rico en Fe demostró una eficiencia solar-hidrógeno (STH) alta y estable del 18,55% en un sistema de división de agua impulsado por energía solar.

Conclusiones:

El dopaje con selenio es una estrategia muy eficaz para mejorar el rendimiento de la OER de FeOOH.
El método de activación desarrollado en el lugar ofrece una ruta prometedora para la producción de electrocatalizadores de alto rendimiento y rentables.
Este enfoque tiene un potencial significativo para avanzar en la producción de hidrógeno limpio a través de la división eficiente del agua solar.

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