Study on diffusion of electroactive species in polyelectrolyte polyethylene glycol lithium perchlorate by chronoamperometry at a microdisk electrode | Zendy

Zhou Huafang | Zendy; Che Guangli | Zendy; Dong Shaojun | Zendy

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Study on diffusion of electroactive species in polyelectrolyte polyethylene glycol lithium perchlorate by chronoamperometry at a microdisk electrode

Author(s) -

Zhou Huafang,

Che Guangli,

Dong Shaojun

Publication year - 1997

Publication title -

electroanalysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.574

H-Index - 128

eISSN - 1521-4109

pISSN - 1040-0397

DOI - 10.1002/elan.1140090110

Subject(s) - chronoamperometry , lithium perchlorate , polyelectrolyte , microelectrode , chemistry , ferrocene , lithium (medication) , diffusion , polyethylene glycol , analytical chemistry (journal) , electrode , cyclic voltammetry , inorganic chemistry , polymer , electrochemistry , chromatography , organic chemistry , thermodynamics , medicine , physics , endocrinology

The mass transport dynamics of ferrocene in polyelectrolyte polyethylene glycol lithium perchlorate (PEG · LiClO 4 ) was studied by using chronoamperometry at a microdisk electrode. Chronoamperometry is a powerful method for the study of mass transport in polyelectrolyte, it has many advantages over the conventional methods at a microelectrode and the steady‐state method at an ultramicroelectrode. By using this method the apparent diffusion coefficient D app and concentration C a of the electroactive species, can be estimated from a single experiment without previous knowledge of either one. We have estimated D app and C a of ferrocene in PEG · LiClO 4 polyelectrolyte from 25°C to 75°C. The dependence on the concentration of electroactive species was observed. The diffusion coefficients decrease with increasing ferrocene concentration and decreasing temperature. The mass transport mechanism is explained by using a free volume model.

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