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Fabrication of VB2/Air Cells for Electrochemical Testing
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Baterías de aire estables de diez mil horas a través de sitios de átomos duales de Fe y W
Yifan Li1, Hanlin Wang1, Chang Chen2
1Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada.
Nature communications
|August 29, 2025
Resumen
Los nuevos sitios activos diatómicos que combinan hierro y tungsteno (Fe-N4 / W-N4) aumentan significativamente la electrocatálisis de oxígeno en baterías recargables de zinc-aire, lo que permite más de 10.000 horas de funcionamiento estable.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Catálisis
Sus antecedentes:
- Las baterías recargables de zinc-aire requieren electrocatalizadores de oxígeno duraderos y activos para su aplicación práctica.
- Los catalizadores existentes a menudo se enfrentan a desafíos de estabilidad y eficiencia.
Objetivo del estudio:
- Desarrollar nuevos sitios activos diatómicos para la electrocatálisis mejorada de oxígeno.
- Mejorar la durabilidad y la eficiencia de las baterías recargables de zinc-aire.
Principales métodos:
- Sitio diatómico de Fe-N4 / W-N4 sintetizado al atrapar el tungsteno de las bolas de molienda dentro de la ftaalocianina.
- Investigó la estructura electrónica y el rendimiento catalítico de los sitios sintetizados.
- Baterías de zinc-aire fabricadas y probadas con el nuevo cátodo de aire Fe, W-N-C.
Principales resultados:
- Se logra una electrocatálisis de oxígeno altamente activa y duradera a través de sitios sinérgicos Fe-N4 y W-N4.
- Se ha demostrado una distribución óptima de electrones en los sitios Fe-N4 debido a los sitios W-N4 vecinos, mejorando la activación y desorción de O2.
- Se observa una mayor estabilidad y prevención de la lixiviación de metales debido a la modulación electrónica del átomo W.
- Las baterías de zinc-aire exhibieron más de 10.000 horas de ciclo estable.
Conclusiones:
- Los sitios diatómicos Fe-N4/W-N4 ofrecen una estrategia prometedora para la electrocatálisis eficiente del oxígeno.
- Los sitios activos de metal 3d reforzados con metal 5d son efectivos para la fabricación de baterías de zinc-aire estables y de alto rendimiento.
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