Investigation of Two-Dimensional Structured Polyaniline for Supercapacitor Applications
type: CreativeWork
description: Mass and charge transport within nanostructures, i.e., nanofluidic study, is essential to the mechanism understanding and further development of electrochemical systems. Two-dimensional (2D) nanofluidic materials featuring well-organized flat nanochannels, as well as adjustable structural and chemical properties have emerged as promising candidates for energy storage, and more importantly, established a perfect platform for ion transport study. The anion-dominated behaviour, which is absent in current EDL (electric double layer)- modulated systems, was comprehensively studied in the 2D structured tungstate anion linked polyaniline (TALP) using the gravimetric probe, electrochemical quartz crystal microbalance. It is revealed that the anion nature affects the movement of solvent molecules via modifying the built EDL. To be specific, the thicker EDL contributed by larger anion size and higher salt concentration leads to a counterflux of water molecules in the TALP interspace. The redox activity of polyaniline is then promoted to explore its effect on the ion behaviour and electrochemical performance of TALP. After introducing Faradaic processes in the 2D TALP system, the ion transport pattern would switch from an anion-dominated process to predominated proton transport mode. Meanwhile, except for extra charge contribution via redox reactions, the additive protons also serve as fast and effective charge carriers in 2D TALP channels, resulting in high capacitance retention at a high rate and for thick electrodes. After investigating the ion behaviours in TALP, this unique nanofluidic system is further explored to integrate with bio-systems. Endowing natural biomass with electroactivity other than carbonization is an appealing challenge in nanobiotechnology. By interfacial self-assembly, conformal TALP thin-film coating could be formed onto the surfaces of the plant stem, which enables the macroscopic electronic and ionic conductivity in the as-formed nanobioassembly. Th…
abstract: Mass and charge transport within nanostructures, i.e., nanofluidic study, is essential to the mechanism understanding and further development of electrochemical systems. Two-dimensional (2D) nanofluidic materials featuring well-organized flat nanochannels, as well as adjustable structural and chemical properties have emerged as promising candidates for energy storage, and more importantly, established a perfect platform for ion transport study. The anion-dominated behaviour, which is absent in current EDL (electric double layer)- modulated systems, was comprehensively studied in the 2D structured tungstate anion linked polyaniline (TALP) using the gravimetric probe, electrochemical quartz crystal microbalance. It is revealed that the anion nature affects the movement of solvent molecules via modifying the built EDL. To be specific, the thicker EDL contributed by larger anion size and higher salt concentration leads to a counterflux of water molecules in the TALP interspace. The redox activity of polyaniline is then promoted to explore its effect on the ion behaviour and electrochemical performance of TALP. After introducing Faradaic processes in the 2D TALP system, the ion transport pattern would switch from an anion-dominated process to predominated proton transport mode. Meanwhile, except for extra charge contribution via redox reactions, the additive protons also serve as fast and effective charge carriers in 2D TALP channels, resulting in high capacitance retention at a high rate and for thick electrodes. After investigating the ion behaviours in TALP, this unique nanofluidic system is further explored to integrate with bio-systems. Endowing natural biomass with electroactivity other than carbonization is an appealing challenge in nanobiotechnology. By interfacial self-assembly, conformal TALP thin-film coating could be formed onto the surfaces of the plant stem, which enables the macroscopic electronic and ionic conductivity in the as-formed nanobioassembly. Th…
author: Yu, Mengying
language: en
license: https://purl.org/coar/access_right/c_abf2
license: https://creativecommons.org/licenses/by/4.0/
date published: 2023
date modified: 2026-07-24T05:32:40Z
provider: University of New South Wales
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: UNSW, Sydney

PropertyValue
property ID: Handle
value: http://hdl.handle.net/1959.4/101212

PropertyValue
property ID: DOI
value: 10.26190/unsworks/24919