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Unificar la evolución del hidrógeno y la cinética de las reacciones de oxidación en la base mediante la

Ershuai Liu¹, Jingkun Li¹, Li Jiao²

¹Department of Chemistry and Chemical Biology , Northeastern University , Boston , Massachusetts 02115 , United States.

Journal of the American Chemical Society

|January 24, 2019

Resumen

La evolución del hidrógeno alcalino y la cinética de las reacciones de oxidación (HER/HOR) se clarifican mediante aductos adsorbidos de hidroxilo (OHad) - agua - catión metálico alcalino (AM+). Estos aductos influyen en las tasas de HER/HOR, ofreciendo nuevas perspectivas para la electroquímica alcalina.

Área de la Ciencia:

La electroquímica
Ciencias de la superficie
Catálisis

Sus antecedentes:

La cinética de la evolución del hidrógeno y las reacciones de oxidación (HER / HOR) en medios alcalinos no se entiende completamente.
HER/HOR son reacciones fundamentales y prácticas en la electroquímica.

Objetivo del estudio:

Para unificar la comprensión de la cinética alcalina HER/HOR.
Elucidar las funciones catalíticas de los adyuctos de hidroxilo (OHad) agua-metal alcalino (AM+) en HER/HOR.

Principales métodos:

Modificación de la superficie con Ni para enriquecer la abundancia de OHad.
Variación de la concentración y la identidad de los cationes metálicos alcalinos (AM+).
Mediciones y análisis electroquímicos basados en la teoría ácido-base duro-blando.

Principales resultados:

El enriquecimiento de OHad en superficies de Ni beneficia tanto a HER como a HOR.
El aumento de la concentración de AM+ promueve selectivamente el HER.
La identidad de AM+ influye tanto en la cinética HER como en la HOR.
Los adductos OHad-{H2O) x-AM+ facilitan la eliminación de OHad, promoviendo el HER.
AM+ desestabiliza el OHad, impidiendo el HOR a través del mecanismo bifuncional.

Conclusiones:

La cinética alcalina de HER/HOR puede unificarse mediante aductos OHad-agua-AM+.
Estos adyuvantes desempeñan funciones distintas en HER y HOR.
Esta comprensión es crucial para el avance de la electroquímica alcalina.

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