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Reacción ácido-base controlada electroquímicamente y confinada en la superficie para un supercondensador H ((+) ultra

Shiyu Gan¹, Lijie Zhong¹, Lifang Gao^1,2

¹State Key Laboratory of Electroanalytical Chemistry, CAS Center for Excellence in Nanoscience, c/o Engineering Laboratory for Modern Analytical Techniques, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, China.

Journal of the American Chemical Society

|January 23, 2016

Resumen

Los investigadores descubrieron el ácido tetracarboxílico de 3,4,9,10 perileno (PTCA) para supercondensadores ultrarrápidos. Este ácido orgánico permite un nuevo mecanismo de almacenamiento de carga con alta capacidad y estabilidad.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Nanotecnología

Sus antecedentes:

Los supercondensadores son dispositivos de almacenamiento de energía cruciales.
Las limitaciones incluyen la densidad de energía y las tasas de carga-descarga.
Se necesitan nuevos materiales para superar estos desafíos.

Objetivo del estudio:

Para explorar el mecanismo de almacenamiento de carga del ácido tetracarboxílico de 3,4,9,10-perileno (PTCA).
Para sintetizar y caracterizar un nanocomplejo de PTCA-grafeno para aplicaciones de supercondensadores.
Evaluar el rendimiento electroquímico del material desarrollado.

Principales métodos:

Síntesis electroquímica y caracterización del PTCA en las superficies de los electrodos.
Fabricación de un nanocomplejo supramolecular de PTCA y grafeno.
Voltametría cíclica y mediciones galvanostáticas de carga y descarga.

Principales resultados:

PTCA exhibe un proceso de protonación / desprotonación reversible, ultrarrápido y no Faradaico.
El nanocomplejo PTCA-grafeno alcanzó una capacitancia específica de 143 F g{-1) a 1000 A g{-1).
Se observó una retención de capacitancia del 73% después de 5000 ciclos, con una amplia ventana de voltaje de 1, 2 V.

Conclusiones:

PTCA demuestra un comportamiento voltamétrico capacitivo único.
Esto sugiere un nuevo mecanismo de almacenamiento de carga para supercondensadores.
El nanocomplejo PTCA-grafeno ofrece una vía prometedora para soluciones avanzadas de almacenamiento de energía.

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