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Layer-by-layer electrode fabrication for improved performance of porous polyimide-based supercapacitors.

Fernando, N., Veldhuizen, H., Nagai, A., Van der Zwaag, S. and Abdelkader, A.M., 2022. Layer-by-layer electrode fabrication for improved performance of porous polyimide-based supercapacitors. Materials, 15 (1), 4.

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DOI: 10.3390/ma15010004

Abstract

Nanoporous polymers are becoming increasingly interesting materials for electrochemical applications, as their large surface areas with redox-active sites allow efficient adsorption and diffusion of ions. However, their limited electrical conductivity remains a major obstacle in practical applications. The conventional approach that alleviates this problem is the hybridisation of the polymer with carbon-based additives, but this directly prevents the utilisation of the maximum capacity of the polymers. Here, we report a layer-by-layer fabrication technique where we separated the active (porous polymer, top) layer and the conductive (carbon, bottom) layer and used these “layered” electrodes in a supercapacitor (SC). Through this approach, direct contact with the electrolyte and polymer material is greatly enhanced. With extensive electrochemical characterisation techniques, we show that the layered electrodes allowed a significant contribution of fast faradic surface reactions to the overall capacitance. The electrochemical performance of the layered-electrode SC outperformed other reported porous polymer-based devices with a specific gravimetric capacitance of 388 F·g−1 and an outstanding energy density of 65 Wh·kg−1 at a current density of 0.4 A·g−1 . The device also showed outstanding cyclability with 90% of capacitance retention after 5000 cycles at 1.6 A·g−1, comparable to the reported porous polymer-based SCs. Thus, the introduction of a layered electrode structure would pave the way for more effective utilisation of porous organic polymers in future energy storage/harvesting and sensing devices by exploiting their nanoporous architecture and limiting the negative effects of the carbon/binder matrix.

Item Type:Article
ISSN:1996-1944
Additional Information:This article belongs to the Section Porous Materials
Uncontrolled Keywords:nanoporous polymer; supercapacitor; polyimide; electrochemistry; electrode fabrication; layer-by-layer
Group:Faculty of Science & Technology
ID Code:36472
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:10 Jan 2022 15:56
Last Modified:10 Jan 2022 15:56

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