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Ru átomos individuales en el carbono N-dopado por confinamiento espacial y estrategias de sustitución iónica para

Xiaolin Hu¹, Gan Luo¹, Qiannan Zhao¹

¹College of Aerospace Engineering, Chongqing University, Chongqing 400044, China.

Journal of the American Chemical Society

|September 3, 2020

Resumen

Los investigadores desarrollaron un nuevo electrocatalizador para baterías de litio-oxígeno (LOB) utilizando átomos de rutenio en carbono dopado con nitrógeno. Este avance mejora significativamente el rendimiento de la batería al reducir el exceso de potencial y mejorar la cinética de carga / descarga.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Almacenamiento de energía

Sus antecedentes:

Las baterías de litio-oxígeno recargables no acuosas (LOB) son muy prometedoras para los vehículos eléctricos y la electrónica.
La reducción lenta del oxígeno (ORR) y la cinética de la evolución del oxígeno (OER) dificultan el desarrollo de LOB.

Objetivo del estudio:

Diseñar y sintetizar un electrocatalizador de alta eficiencia para los LOB.
Para superar las limitaciones cinéticas de ORR y OER en los LOB.

Principales métodos:

Síntesis de átomos individuales de Ru en carbono poroso dopado con nitrógeno (Ru SAs-NC) mediante confinamiento espacial asistido por MOF y sustitución iónica.
Empleado Ru$_{0.3}$ SAs-NC como el electrocatalisador en electrodos de respiración de oxígeno.
Se utilizó DEMS in situ para cuantificar el rendimiento electroquímico.

Principales resultados:

Se alcanzó el sobrepotencial más bajo de 0,55 V a 0,02 mA cm$^{-2}$ en LOBs.
Cuantificó una relación de 2,14, lo que indica una eficiencia electrocatalítica superior.
Los cálculos teóricos identificaron a Ru-N$_{4}$ como el centro activo, que influye en la afinidad de las especies intermedias.

Conclusiones:

El catalizador Ru SAs-NC mejora significativamente el rendimiento LOB al abordar los pasos que limitan la velocidad en ORR y OER.
Este trabajo proporciona una nueva estrategia para el diseño de catalizadores de un solo sitio altamente eficientes con la máxima utilización atómica para los LOB.

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