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Co-dopaje sinérgico e ingeniería de defectos de Te en monocristales de NiTe₂ para mejorar la evolución de hidrógeno

Zilong Xie¹, Qingyan Li¹, Jing Fang¹

¹Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China. bliu0201@foxmail.com.

Dalton transactions (Cambridge, England : 2003)

|January 22, 2026

Resumen

Optimizamos catalizadores de telururo de níquel (NiTe₂) para la reacción de evolución de hidrógeno (HER) utilizando dopaje de cobalto y vacantes de telurio. Esta estrategia mejora significativamente la actividad catalítica en condiciones ácidas y alcalinas.

Área de la Ciencia:

Ciencia de Materiales
Electroquímica
Catálisis

Sus antecedentes:

Los dicalcogenuros de metales de transición (TMD) son catalizadores prometedores para la reacción de evolución de hidrógeno (HER).
El telururo de níquel (NiTe₂) presenta limitaciones en la energía de adsorción de hidrógeno y la densidad de sitios activos para una HER eficiente.

Objetivo del estudio:

Mejorar el rendimiento de la HER del NiTe₂ en electrolitos ácidos y alcalinos.
Desarrollar una estrategia sinérgica que involucre el dopaje de cobalto y la ingeniería de vacantes de telurio.

Principales métodos:

Se sintetizaron monocristales de Ni₁-ₓCoₓTe₂ con dopaje de cobalto controlado y vacantes de Te.
Se caracterizaron las propiedades estructurales y electrónicas de los catalizadores modificados.
Se evaluó la actividad electrocatalítica y la estabilidad para la HER.

Principales resultados:

El dopaje con Co redujo la resistencia a la transferencia de carga en un 80% e indujo una contracción de la red.
Las vacantes de Te aumentaron la densidad de sitios activos, mejorando la capacitancia de doble capa en un 31%.
El Ni₀.₆Co₀.₄Te₂ optimizado logró una energía de adsorción de hidrógeno casi ideal y sobrepotenciales ultrabajos (419 mV ácido, 362 mV alcalino) con una estabilidad >80 h.

Conclusiones:

La ingeniería sinérgica de dopaje de Co y vacantes de Te optimiza eficazmente el NiTe₂ para la catálisis bifuncional de HER.
La estrategia desarrollada ofrece un enfoque escalable para el diseño de electrocatalizadores eficientes para medios ácidos y alcalinos.

Palabras clave:

telururo de níquel dopaje de cobalto vacantes de telurio reacción de evolución de hidrógeno electrocatalizadores entornos ácidos y alcalinos

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