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Complejos de níquel(II) planos cuadrados modificados con ligandos, con ligandos tridentados NNS
Shivendra Kumar Pandey1, Sujeet Pandey1, Swati Singh1
1Department of Chemistry, Banaras Hindu University, Varanasi 221005, India.
Inorganic chemistry
|December 16, 2025
Resumen
Nuevos complejos de níquel muestran alta eficiencia como electrocatalizadores para la reacción de evolución de oxígeno (OER) en electrólisis de agua alcalina. El complejo [Ni(dCl)Cl] logró un bajo sobrepotencial de 320 mV para 10 mA cm⁻², destacando su potencial para la producción de hidrógeno energéticamente eficiente.
Área de la Ciencia:
- Ciencia de Materiales
- Electroquímica
- Química Inorgánica
Sus antecedentes:
- Los electrocatalizadores eficientes son cruciales para reducir el consumo de energía en la electrólisis del agua.
- El desarrollo de catalizadores rentables para la reacción de evolución de oxígeno (OER) en medios alcalinos es un desafío clave.
Objetivo del estudio:
- Sintetizar y caracterizar nuevos complejos de níquel(II) con ligandos de hidrazina-1-carbotioamida.
- Evaluar la actividad electrocatalítica de estos complejos para la OER en condiciones alcalinas.
Principales métodos:
- Síntesis de cuatro complejos de níquel(II) derivados de 2-acetilpiridina y ligandos de hidrazina-1-carbotioamida sustituidos.
- Caracterización mediante técnicas espectroscópicas (FT-IR, Raman, UV-visible), difracción de rayos X, voltamperometría cíclica (CV), PXRD, XPS, SEM y TEM.
- Pruebas electrocatalíticas de rendimiento de OER en condiciones alcalinas.
Principales resultados:
- El complejo de níquel [Ni(dCl)Cl] exhibió un excelente rendimiento de OER, requiriendo solo 320 mV de sobrepotencial para alcanzar 10 mA cm⁻².
- Se propone que la geometría de coordinación plano-cuadrada y el aumento del estado de oxidación de Ni mejoran la actividad de OER.
- Se identificó la activación in situ del complejo molecular a Ni(O)OH en la interfaz [Ni(dCl)Cl]/Ni(O)OH como el sitio catalítico activo.
Conclusiones:
- Los complejos de níquel sintetizados, en particular [Ni(dCl)Cl], muestran una promesa significativa como electrocatalizadores eficientes para OER.
- El estudio dilucida el mecanismo de activación y el papel de la interfaz del catalizador en la OER.
- Estos hallazgos contribuyen al desarrollo de materiales avanzados para tecnologías de energía sostenible como la electrólisis del agua.
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