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Polímeros metálico-orgánicos de coordinación de alta simetría basados en grupos tetranucleares cuadrados-planos para

Miao Wang¹, Ya-Ru Meng², Wenjie Xu³

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, Suzhou Key Laboratory of Green Intelligent Manufacturing of New Energy Materials and Devices, Tianchang New Materials and Energy Technology Research Center, 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

|May 14, 2025

Resumen

Los polímeros metálico-orgánicos (MOP) permiten una conversión electroquímica eficiente de nitrato en amoníaco. Los MOP basados en cobalto (Co-TATB) logran una selectividad de amoníaco de ~ 98%, lo que ofrece ideas para el diseño del catalizador.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Catálisis

Sus antecedentes:

Los polímeros metálico-orgánicos (MOP) son catalizadores prometedores en un solo sitio para la conversión electroquímica de nitrato en amoníaco.
Se necesita una comprensión molecular más profunda para mejorar el diseño del electrocatalizador MOP.

Objetivo del estudio:

Construir MOP de coordinación de alta simetría para la reducción de nitratos.
Investigar el rendimiento catalítico y el mecanismo de reacción de estos MOP.

Principales métodos:

Síntesis de Mn-TATB, Fe-TATB y Co-TATB utilizando grupos metálicos específicos y ligandos H3TATB.
Pruebas electroquímicas en condiciones de reacción de reducción de nitratos (NITRR).
Espectroscopia in situ y cálculos teóricos para elucidar las vías de reacción.

Principales resultados:

Co-TATB exhibió una eficiencia Faradaic del ~98% para la producción de amoníaco en un amplio rango potencial.
El rendimiento estable se mantuvo a altas densidades de corriente (~ 332.1 mA cm-2) en una célula de flujo.
El análisis de la vía de reacción reveló el mecanismo intrínseco de Co-TATB en NITRR.

Conclusiones:

Los MOP de alta simetría ofrecen una conversión electrocatalítica eficiente de nitrato a amoníaco.
El Co-TATB es un electrocatalizador altamente selectivo y estable para el NITRR.
Los resultados proporcionan principios de diseño estratégico para los MOP en el tratamiento de aguas residuales y la síntesis de amoníaco.

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