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Correlaciones estructura-función en electrodos serigrafiados de grafeno: comportamiento capacitivo y de faradaico

Tharinda Kasemphong1, Monchai Jitvisate2, Chanida Jakkrawhad1

  • 1School of Chemistry, Institute of Science, Suranaree University of Technology, 111 University Avenue, Suranaree, Muang, Nakhon Ratchasima 30000, Thailand. kamonwad@g.sut.ac.th.

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Resumen

El origen del grafeno impacta las interfaces de los electrodos serigrafiados. La química superficial, no la morfología, dicta el potencial, mientras que la capacitancia se relaciona con la humectación y la porosidad, guiando la selección de precursores para aplicaciones.

Palabras clave:
grafenoelectrodos serigrafiadoselectrocatálisiscapacitanciatransferencia de electrones

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Área de la Ciencia:

  • Electroquímica
  • Ciencia de Materiales
  • Ciencia de Superficies

Sus antecedentes:

  • La influencia del origen del grafeno en el comportamiento interfacial en electrodos serigrafiados sigue siendo poco comprendida.
  • La diversa fabricación del grafeno conduce a propiedades físicas y químicas variadas.

Objetivo del estudio:

  • Investigar cómo los diferentes orígenes del grafeno afectan las propiedades electroquímicas interfaciales de los electrodos serigrafiados.
  • Correlacionar las métricas interfaciales con las características físicas para la selección optimizada del precursor de grafeno.

Principales métodos:

  • Fabricación de cuatro tipos de electrodos serigrafiados de grafeno (comercial, derivado de combustión, exfoliado, cultivado en CVD) utilizando una tinta estandarizada y un protocolo de impresión.
  • Aplicación de electroanálisis convencional y espectroscopía electroquímica de potencial escalonado para determinar la capacitancia diferencial (C(E)) y las escalas de tiempo de carga (τ).
  • Evaluación de la cinética de transferencia de electrones heterogénea para un par redox ([Fe(CN)6]4-/3-) para sondear procesos faradaicos.

Principales resultados:

  • Todos los electrodos exhibieron potenciales de punto cero de carga (PZC) similares (0,35-0,40 V vs. Ag/AgCl), gobernados principalmente por la química superficial y la estructura electrónica.
  • La capacitancia de doble capa (Cdl) se correlacionó con la humectación del electrodo y la mesoporosidad.
  • Las escalas de tiempo de carga (τ) fueron consistentes (15-25 ms) y estuvieron influenciadas por el equilibrio entre la resistencia de acceso iónico y la capacitancia.
  • Las tasas de transferencia de electrones heterogénea (k0) dependieron de las funcionalidades de borde, defecto y oxígeno, en lugar de la conductividad de la película, con valores que oscilan entre (0,76-1,99) × 10^-5 m s^-1.

Conclusiones:

  • Las propiedades electroquímicas interfaciales (capacitivas y faradaicas) de los electrodos serigrafiados de grafeno están directamente relacionadas con características físicas como la porosidad, la densidad de defectos y la química superficial.
  • Estos hallazgos ofrecen criterios iniciales para seleccionar precursores de grafeno apropiados en función de las características interfaciales deseadas para aplicaciones en detección, catálisis y almacenamiento de energía.