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Mejora de la actividad de la evolución del hidrógeno electrocatalítico con una estructura heteronáutica de NiPt3
Chakadola Panda1, Prashanth W Menezes1, Shenglai Yao1
1Department of Chemistry: Metalorganics and Inorganic Materials , Technische Universität Berlin , Straße des 17 Juni 135, Sekr. C2 , 10623 Berlin , Germany.
Journal of the American Chemical Society
|August 15, 2019
Resumen
Los investigadores desarrollaron nuevas estructuras heteronanas de sulfuro de níquel-platino (NiPt3@NiS) para una producción eficiente de hidrógeno. Estos catalizadores muestran una actividad y estabilidad superiores en soluciones alcalinas, allanando el camino para la generación de hidrógeno verde escalable.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Nanotecnología
Sus antecedentes:
- El desarrollo de electrocatalizadores eficientes para la reacción de evolución del hidrógeno (HER) es crucial para las tecnologías de energía limpia.
- Los catalizadores existentes a menudo se enfrentan a limitaciones en actividad, estabilidad o costo, especialmente en medios alcalinos.
Objetivo del estudio:
- Sintetizar y caracterizar las nuevas estructuras heteronanas NiPt3@NiS como electrocatalizadores de alto rendimiento para HER.
- Evaluar la actividad catalítica y la estabilidad a largo plazo de los materiales sintetizados en soluciones alcalinas.
Principales métodos:
- Una vía sintética fácil que utiliza un precursor molecular heterobimetálico de níquel y platino con puente de subsulfuro.
- Fabricación de NiPt3@NiS en espuma de níquel para pruebas electroquímicas.
- Mediciones electroquímicas para determinar el exceso de potencial y la estabilidad de HER.
Principales resultados:
- Las heteronanostructuras de NiPt3@NiS exhibieron un sobrepotencial excepcionalmente bajo de 12 mV a -10 mA cm-2.
- El catalizador sintetizado demostró una actividad significativamente mayor en comparación con el platino puro o el sulfuro de níquel.
- Se observó una incesante estabilidad de HER durante más de 8 días, superando a los catalizadores actuales basados en platino.
Conclusiones:
- Las heteronanostructuras de NiPt3@NiS representan un electrocatalizador altamente activo y estable para la evolución del hidrógeno en soluciones alcalinas.
- La síntesis fácil y el rendimiento superior indican el potencial para la producción de hidrógeno escalable.
- Este trabajo ofrece una vía prometedora para el avance de los materiales electrocatalíticos para aplicaciones de energía renovable.
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