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Polímeros de coordinación basados en clústeres de cobalto para la electrorreducción eficiente de nitrato a amoníaco

Miao Wang¹, Shufan Li², Yuming Gu¹

¹State Key Laboratory of Coordination Chemistry, MOE Key Laboratory of Mesoscopic Chemistry, MOE Key Laboratory of High Performance Polymer Materials and Technology, Jiangsu Key Laboratory of Advanced Organic Materials, Tianchang New Materials and Energy Technology Research Center, Research Institute of Green Chemistry and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China.

Journal of the American Chemical Society

|July 12, 2024

Resumen

Los nuevos polímeros de coordinación basados en cobalto, NJUZ-2 y NJUZ-3, convierten eficientemente el nitrato en amoníaco. Estos materiales ofrecen una alta selectividad y durabilidad para el tratamiento de aguas residuales y la síntesis de amoníaco.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Química del medio ambiente

Sus antecedentes:

La reacción de reducción de nitrato electrocatalítico (NITRR) es crucial para la purificación de aguas residuales y la síntesis de amoníaco.
Se necesitan electrocatalizadores eficientes para la producción selectiva de amoníaco a través del NITRR.

Objetivo del estudio:

Diseñar y sintetizar nuevos polímeros de coordinación basados en clusters de cobalto para el NITRR.
Investigar el rendimiento electrocatalítico y el mecanismo de estos materiales para la síntesis selectiva de amoníaco.

Principales métodos:

Síntesis de dos polímeros de coordinación basados en clústeres de cobalto (NJUZ-2 y NJUZ-3).
Evaluación electrocatalítica del NITRR en las celdas de tipo H y de flujo.
Caracterización mediante análisis experimentales y cálculos teóricos.

Principales resultados:

NJUZ-2 y NJUZ-3 exhiben una alta eficiencia Faradaic (~ 98.5%) y durabilidad para la producción selectiva de amoníaco a -0.8 V.
El excelente rendimiento se mantiene en condiciones ácidas.
El funcionamiento de la célula de flujo logró una alta tasa de rendimiento de NH3 (3370,6 mmol h-1 g-1cat.) a -0,5 V, con un rendimiento muy superior al de las células de tipo H.

Conclusiones:

Los nuevos polímeros de coordinación demuestran una notable actividad catalítica y selectividad para NITRR.
El rendimiento mejorado se atribuye a la adsorción preferencial de nitrato y a la reducción de la energía de hidrogenación intermedia.
Estos materiales muestran un gran potencial para el tratamiento eficiente de las aguas residuales y la producción de amoníaco.

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