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Electrochemical Studies of C60-Fullerene Microcrystals Attached to a Solid State Electrode

Electrochemistry behaviours of C₆₀ attached with physical method: solvent casting and mechanically attachment, to various solid-state electrode surfaces (gold, glassy carbon and platinum) were studied in aqueous and non-aqueous solution containing a variety of doping cations such as Group I alkal...

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Main Author: Lim, Ei Bee
Format: Thesis
Language:English
English
Published: 2001
Subjects:
Electrochemistry - Research
Online Access:http://psasir.upm.edu.my/id/eprint/9359/1/FSAS_2002_3.pdf
http://psasir.upm.edu.my/id/eprint/9359/
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spelling my.upm.eprints.93592024-02-21T01:17:17Z http://psasir.upm.edu.my/id/eprint/9359/ Electrochemical Studies of C60-Fullerene Microcrystals Attached to a Solid State Electrode Lim, Ei Bee Electrochemistry behaviours of C₆₀ attached with physical method: solvent casting and mechanically attachment, to various solid-state electrode surfaces (gold, glassy carbon and platinum) were studied in aqueous and non-aqueous solution containing a variety of doping cations such as Group I alkali-metal cations and quatemaI)'-ammonium R4N+. Electroreduction and reoxidation of microcrystalline C₆₀ in 0.1 M TBAPF₆/ACN showed one to four pairs, characteristic solid state current-potential curve, with only first and second pairs appeared to be stable and reversible. In contact with 0.1 M TBAPF₆/ACN, the large peak separation and small maximum at reverse scan observed with cyclic voltammetric experiments, as well as the current-time transients obtained in chronoamperometric experiments produce evidence of nucleation and growth (N&G) processes at the electrolytesolid- electrode interface. C60 cast onto glassy carbon or gold electrodes showed very different results of cyclic voltammetry (CV), chronocoulometry (CC), and chronoamperometry (CA) in aqueous and non-aqueous solutions. With the presence of alkali-metal cations in aqueous electroyte, MnC₆₀ (M = LI⁺, Na⁺, K⁺, R⁺, Cs⁺, n = 1 to 6) was formed at the end of potential scan, and the loss of faradaic activity when oxidizing MnC60 at reverse of potential scan indicated the formation of non-electroactive and irreversible species. In aqueous solution, CV results showed a parallel shift in reduction peak position as the sizes of cation increased. A glassy carbon electrode modified by C60 coat was used to mediate the oxidation of cysteine in contact with an aqueous electrolyte containing potassium cation. Under conditions of cyclic voltammetry, the potential of cysteine is lowered by approximate 100 m V and current is enhanced significantly relative to the situation prevailing when a bare glassy carbon electrode is used. Mediation also occurs when the potential range covered include that of Cw/C60n- redox couples. 2001-12 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/9359/1/FSAS_2002_3.pdf Lim, Ei Bee (2001) Electrochemical Studies of C60-Fullerene Microcrystals Attached to a Solid State Electrode. Masters thesis, Universiti Putra Malaysia. Electrochemistry - Research English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
topic Electrochemistry - Research
spellingShingle Electrochemistry - Research
Lim, Ei Bee
Electrochemical Studies of C60-Fullerene Microcrystals Attached to a Solid State Electrode
description Electrochemistry behaviours of C₆₀ attached with physical method: solvent casting and mechanically attachment, to various solid-state electrode surfaces (gold, glassy carbon and platinum) were studied in aqueous and non-aqueous solution containing a variety of doping cations such as Group I alkali-metal cations and quatemaI)'-ammonium R4N+. Electroreduction and reoxidation of microcrystalline C₆₀ in 0.1 M TBAPF₆/ACN showed one to four pairs, characteristic solid state current-potential curve, with only first and second pairs appeared to be stable and reversible. In contact with 0.1 M TBAPF₆/ACN, the large peak separation and small maximum at reverse scan observed with cyclic voltammetric experiments, as well as the current-time transients obtained in chronoamperometric experiments produce evidence of nucleation and growth (N&G) processes at the electrolytesolid- electrode interface. C60 cast onto glassy carbon or gold electrodes showed very different results of cyclic voltammetry (CV), chronocoulometry (CC), and chronoamperometry (CA) in aqueous and non-aqueous solutions. With the presence of alkali-metal cations in aqueous electroyte, MnC₆₀ (M = LI⁺, Na⁺, K⁺, R⁺, Cs⁺, n = 1 to 6) was formed at the end of potential scan, and the loss of faradaic activity when oxidizing MnC60 at reverse of potential scan indicated the formation of non-electroactive and irreversible species. In aqueous solution, CV results showed a parallel shift in reduction peak position as the sizes of cation increased. A glassy carbon electrode modified by C60 coat was used to mediate the oxidation of cysteine in contact with an aqueous electrolyte containing potassium cation. Under conditions of cyclic voltammetry, the potential of cysteine is lowered by approximate 100 m V and current is enhanced significantly relative to the situation prevailing when a bare glassy carbon electrode is used. Mediation also occurs when the potential range covered include that of Cw/C60n- redox couples.
format Thesis
author Lim, Ei Bee
author_facet Lim, Ei Bee
author_sort Lim, Ei Bee
title Electrochemical Studies of C60-Fullerene Microcrystals Attached to a Solid State Electrode
title_short Electrochemical Studies of C60-Fullerene Microcrystals Attached to a Solid State Electrode
title_full Electrochemical Studies of C60-Fullerene Microcrystals Attached to a Solid State Electrode
title_fullStr Electrochemical Studies of C60-Fullerene Microcrystals Attached to a Solid State Electrode
title_full_unstemmed Electrochemical Studies of C60-Fullerene Microcrystals Attached to a Solid State Electrode
title_sort electrochemical studies of c60-fullerene microcrystals attached to a solid state electrode
publishDate 2001
url http://psasir.upm.edu.my/id/eprint/9359/1/FSAS_2002_3.pdf
http://psasir.upm.edu.my/id/eprint/9359/
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score 13.211869

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