Revealing Kinetics Process of Fast Charge‐Storage Behavior Associated with Potential in 2D Polyaniline

Abstract

Clarifying the electrode kinetics and thermodynamic processes of 2D materials in electrochemical energy‐storage system becomes an important topic, especially for the system with complex and interlaced electrochemical processes. One single analytical method can hardly describe the diffusion‐controlled and interface‐reaction‐controlled process. Hence, the tungstate‐linked polyaniline, a novel 2D conductive polymer with obvious Faradaic reaction, is introduced, as the research object. Based on the multi‐scan rate cyclic voltammetry data, the applicable rules of different electrochemical kinetic treatment methods are proved effectively: the rate fitting equation based on theoretical capacitance calibration is more suitable to describe the kinetic behavior of interface‐reaction‐controlled process, while the power–law relationship based on the b value is more reasonable to study the diffusion‐controlled process. Moreover, the higher capacitance of the electrode materials in acidic electrolyte is emphasized via in situ electrochemical testing techniques. Proton intercalation and participating in the redox reaction can obviously accelerate the electrode process. The developed multidimensional assessment method is superior in more accurate analysis of the kinetics of electrochemical energy‐storage devices.

Pushing the Electrochemical Performance Limits of Polypyrrole Toward Stable Microelectronic Devices

“…The overall capacitance of conducting polymers (CPs) comes from the reversible redox reactions of π – π conjugated double bond present in the polymer complex, in addition to the double-layer charge storage mechanism of carbon present in the polymer matrix [ 27 , 28 ]. Irrespective of their superficial potential, the industrialization of CPs-based capacitors is stalled by poor cycling stability owing to the bulk structures which constrain the consumption of material opening to electrolytes [ 29 , 30 ]. Secondly, the adhesion of electrochemically polymerized film on planar current collectors has low adhesion, which causes high contact resistance and affects the electrochemical performance of the devices [ 31 , 32 ].…”

Facile preparation of a MXene–graphene oxide membrane and its voltage-gated ion transport behavior

“…8–10 Under strict nanoconfinement (<2 nm), owing to the unique crowding of intermolecular forces, the transportation of ions is subject to surface potential-induced interfacial double electrical layer (EDL), resulting in special ion kinetics. 9–13 As the origin of various electrical phenomena, 1 the EDL and transport of electrolytes within EDL have been extensively studied in the last decade, particularly because of their central role in colloid science. 14–16 Therefore, controllable ion channels are emerging as a concept to achieve high throughput and selectivity, causing considerable concern that these channels are both extremely permeable to water and extremely selective to other species.…”