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La espectroscopia Raman in situ revela la estructura y la disociación del agua interfacial
Yao-Hui Wang1, Shisheng Zheng2, Wei-Min Yang1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, iChEM, College of Chemistry and Chemical Engineering, College of Energy, College of Materials, College of Physical Science and Technology, Xiamen University, Xiamen, China.
Nature
|December 2, 2021
Resumen
El estudio del agua interfacial en superficies de un solo cristal de paladio revela que las estructuras de agua ordenadas mejoran la reacción de evolución del hidrógeno (HER). El ajuste catiónico local puede optimizar estas estructuras para mejorar la electrocatálisis.
Área de la Ciencia:
- Ciencias de la superficie
- Ciencias de la energía
- Catálisis
Sus antecedentes:
- Comprender el agua interfacial sólido-líquido es crucial para la ciencia de la superficie, la energía y la catálisis.
- Los electrodos monocristalinos atómicamente planos sirven como catalizadores modelo para estudiar las relaciones estructura-actividad.
- Probar el agua interfacial es un desafío debido a la interferencia de agua a granel y entornos complejos.
Objetivo del estudio:
- Investigar la estructura y la dinámica interfacial del agua en superficies monocristalinas de paladio atómicamente planas.
- Aclarar el papel del agua interfacial en los procesos electrocatalíticos, específicamente en la reacción de evolución del hidrógeno (HER).
- Explorar la influencia de los electrolitos y las propiedades de la superficie del electrodo en la estructura del agua interfacial.
Principales métodos:
- Mediciones electroquímicas
- Espectroscopia Raman in situ
- Modelado computacional
Principales resultados:
- La evidencia espectral directa identificó el agua interfacial como agua hidrogenada e hidratada de iones Na+.
- En los potenciales HER, el agua interfacial pasó de estructuras aleatorias a estructuras ordenadas, impulsadas por el potencial de sesgo y la cooperación de iones Na+.
- Las estructuras de agua interfacial ordenadas facilitaron la transferencia eficiente de electrones, lo que llevó a un aumento de las tasas de HER.
Conclusiones:
- La estructura del agua interfacial tiene un impacto significativo en la eficiencia electrocatalítica.
- Se pueden emplear estrategias de ajuste catiónico local para ordenar el agua interfacial.
- Los hallazgos generalizables sugieren el potencial para mejorar las tasas de reacción electrocatalíticas a través del ordenamiento de agua interfacial.
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