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El papel de Cu3+ en la actividad de la evolución del oxígeno de los óxidos de cobre
Pooja Basera1,2, Yang Zhao3, Angel T Garcia-Esparza4
1Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States.
Journal of the American Chemical Society
|May 1, 2025
Resumen
Este estudio proporciona pruebas directas para el hidróxido de cobre (CuOOH) en la catálisis de oxidación de agua alcalina, revisando los diagramas de fase cobre-agua. Identifica a CuOOH como una especie clave que mejora la actividad de la reacción de evolución del oxígeno (OER).
Área de la Ciencia:
- La electroquímica
- Ciencias de los materiales
- Catálisis
Sus antecedentes:
- Los óxidos e hidróxidos de cobre son cruciales para la catálisis y la corrosión.
- Las investigaciones anteriores carecían de pruebas directas para las especies de hidróxido de cobre (CuOOH) en condiciones de oxidación del agua.
Objetivo del estudio:
- Investigar la formación y la estabilidad de las especies de Cu3+ a granel y de superficie durante la catálisis por oxidación de agua en medios alcalinos.
- Proporcionar pruebas experimentales directas de CuOOH y aclarar su papel en la reacción de evolución del oxígeno (OER).
Principales métodos:
- Termodinámica computacional para determinar la estabilidad CuOOH y la energía libre.
- Voltametría cíclica para observar las ondas de oxidación Cu2+/3+.
- Espectroscopia de absorción por excitación de rayos X (ME-XAS) para detectar huellas digitales de Cu3+.
- Espectroscopia Raman in situ para la identificación de las especies de cobre.
Principales resultados:
- CuOOH es estable en la región OER Pourbaix, lo que requiere revisiones de los diagramas de fase Cu-H2O.
- Se prevé que los sitios activos para OER en CuOOH sean sitios puente O* entre los átomos de Cu3+.
- Las trazas de hierro (Fe) mejoran la actividad catalítica OER.
- Las técnicas experimentales confirmaron la presencia de especies de Cu3+ e identificaron características de CuOOH.
Conclusiones:
- Este trabajo ofrece evidencia directa de las especies de Cu3+ a granel formadas electroquímicamente en condiciones OER.
- Los hallazgos amplían la comprensión de los mecanismos de oxidación del cobre y la actividad catalítica en medios alcalinos.
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