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Updated: Sep 9, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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Ingeniería Ni-N₂ O₂ Coordinación en catalizadores monoatómicos para la evolución del hidrógeno alcalino

Rongwei Xu¹, Guangxu Yao¹, Shicheng Xu¹

¹The school of Chemistry and Chemical Engineering, State Key Laboratory of Power Transmission Equipment and System Security, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City 400044, P. R. China.

Inorganic chemistry

|September 3, 2025

Resumen

Los investigadores diseñaron un nuevo catalizador de un solo átomo de níquel-nitrógeno (Ni-N₂ O₂) en nanofibras de carbono. Este catalizador muestra un excelente rendimiento para las reacciones de evolución de hidrógeno en soluciones alcalinas.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Catálisis

Sus antecedentes:

Los catalizadores de un solo átomo (SAC) ofrecen una alta eficiencia de utilización de átomos para la electrocatálisis.
La adaptación del entorno de coordinación de los átomos metálicos en los SAC es crucial para optimizar la actividad catalítica.
Los SAC tradicionales basados en níquel a menudo presentan coordinación Ni-N₄, lo que limita su potencial.

Objetivo del estudio:

Diseñar y sintetizar un nuevo catalizador monoatómico con un entorno de coordinación Ni-N₂O₂ único.
Investigar el rendimiento electrocatalítico del nuevo catalizador para la reacción de evolución del hidrógeno (HER).
Demostrar la eficacia de la ingeniería de coordinación en la mejora de los SAC para la escisión del agua alcalina.

Principales métodos:

Estrategia de ingeniería de coordinación para inmovilizar átomos de níquel en nanofibras de carbono dopadas con nitrógeno (NCNF).
Caracterización de la estructura del catalizador mediante difracción de rayos X de un solo cristal y espectroscopia de absorción de rayos X.
Prueba electroquímica del catalizador Ni-N₂O₂/NCNFs para HER en 1,0 M KOH.

Principales resultados:

Sintetizó con éxito un nuevo catalizador Ni-N₂O₂/NCNFs con átomos de níquel dispersos atómicamente.
El entorno de coordinación Ni-N₂O₂ fue confirmado por técnicas avanzadas de caracterización.
El catalizador alcanzó un bajo sobrepotencial de 37 mV a 10 mA cm-2 para HER en medios alcalinos.

Conclusiones:

La configuración de coordinación Ni-N₂ O₂ mejora significativamente la actividad de HER en comparación con los sitios tradicionales Ni-N_4.
La ingeniería de coordinación es una estrategia viable para diseñar SAC altamente eficientes y estables.
Este trabajo proporciona información valiosa para el desarrollo de catalizadores avanzados para la división de agua alcalina y otras aplicaciones electroquímicas.

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