Mechanism of self-discharge in conductive polymer electrodes

Shinozaki, Kenji; Kabumoto, Akira; Satō, Hajime; Watanabe, Kazuo; Umemura, Humio; Tanemura, Sakae

doi:10.1016/0379-6779(90)90098-6

Cited by 10 publications

(4 citation statements)

References 5 publications

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“…It is tempting to use these electrical features to introduce addressability and bistability of an electrochemical device in passively addressed display or memory matrices. However, the electrical conductivity of the semiconducting state is too low ( 21 ) and thus limits the speed of the resulting devices, whereas the bistability is poor because of parasitic side reactions (self-discharge phenomenon) ( 22 , 23 ). Polymer electrochemical devices are commonly made to operate in the fast-switching regime by reducing the operational voltage range such that the neutral semiconducting state is never fully reached.…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric polarization induces electronic nonlinearity in ion-doped conducting polymers

Fabiano

Sani

Kawahara³

et al. 2017

Sci. Adv.

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Section: Introductionmentioning

confidence: 99%

Ferroelectric polarization induces electronic nonlinearity in ion-doped conducting polymers

Fabiano

Sani

Kawahara³

et al. 2017

Sci. Adv.

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“…For p-doped materials, including polyacetylene, polyparaphenylene, polypyrrole (PPy), and polythiophene overoxidation limits the achievable charge capacities and the use of conducting polymers for high capacity applications. Poor stability and self-discharge have also inhibited the use of conducting polymers in battery applications. − …”

Section: Introductionmentioning

confidence: 99%

Activation Barriers Provide Insight into the Mechanism of Self-Discharge in Polypyrrole

et al. 2014

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Conducting polymers are envisioned to play a significant role in the development of organic matter based electrical energy conversion-and storage systems. However, successful utilization of conducting polymers relies on a fundamental understanding of their inherent possibilities and limitations. In this report we have studied the temperature dependence of the self-discharge in polypyrrole and show that the rate of self-discharge is kinetically controlled by a polymer intrinsic endergonic electron transfer reaction forming a reactive intermediate. We further show that this intermediate is intimately linked to a process known as overoxidation. This process is general for most, if not all, p-doped conducting polymers irrespective of medium. The results herein are therefore expected to significantly impact the development of future energy storage systems with conducting polymer based components.

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“…While some claims of a reduced self-discharge have been reported [20], others report no significant improvement [16,17]. Self-discharge of negative polypyrrole (PPy) electrodes due to oxidation by oxygen as well as oxidation of the electrolyte on the positive electrode has also been proposed [10] although the latter was considered unlikely in another report [12]. Self-dischargecontrolled by a rate-limiting faradaic reaction has likewise recently been suggested [22] based on fits of the experimental data to the three models proposed by Conway [8].…”

Section: Introductionmentioning

confidence: 95%

“…While the reasons for the self-discharge have been studied for conventional electrochemical supercapacitors [8,9], less attention has been paid to studies of the origin of the self-discharge for electronically conducting polymers despite its significant practical importance. While some efforts have been made to study the cause of the selfdischarge in such systems [8,[10][11][12][13][14][15][16][17][18][19], the main focus has generally been on the demonstration of the problem rather than attempts to identify the underlying cause of this phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Self-discharge Reactions in Energy Storage Devices Based on Polypyrrole-cellulose Composite Electrodes

Olsson¹,

Sjödin²,

Berg³

et al. 2014

Green

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The self-discharge behavior of organic electrodes and symmetric devices for sustainable energy storage, composed of electrodes containing a thin layer of polypyrrole coated onto a high surface area cellulose matrix, has been studied for the first time using different electrode sizes and electrolytes. Experimental data from open circuit measurements of the individual electrode potentials of charged symmetrical two-electrode energy storage devices as a function of time were evaluated based on three different self-discharge models. This evaluation clearly showed that the self-discharge process of the positive electrode is governed by a previously undetected activation-controlled faradaic reaction while the selfdischarge of the negative electrode is due to diffusion controlled oxidation involving oxygen dissolved in the electrolyte. Potentiostatic three-electrode measurements and spectroelectrochemical experiments also showed that protons as well as maleimide were released from positively polarized polypyrrole electrodes. These new findings clearly show that the self-discharge of the cells originate from two different types of reactions on the positive and negative electrodes and that the main contribution to the self-discharge of the cells comes from an activation controlled reaction involving the positive electrode. These results provide an improved understanding of polypyrrole based devices and also yield new possibilities for the development of stable conducting polymer system for energy storage applications.

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Mechanism of self-discharge in conductive polymer electrodes

Cited by 10 publications

References 5 publications

Ferroelectric polarization induces electronic nonlinearity in ion-doped conducting polymers

Ferroelectric polarization induces electronic nonlinearity in ion-doped conducting polymers

Activation Barriers Provide Insight into the Mechanism of Self-Discharge in Polypyrrole

Self-discharge Reactions in Energy Storage Devices Based on Polypyrrole-cellulose Composite Electrodes

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