Identification of Processes that Occur after Reduction and Dissolution of C60 Adhered to Gold, Glassy Carbon, and Platinum Electrodes Placed in Acetonitrile (Electrolyte) Solution

Alan M. Bond, Wujian Miao, Colin L. Raston

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Microcrystals of C60(solid) may be adhered to glassy carbon, gold, and platinum electrodes. When the electrodes containing C60(solid) are placed in acetonitrile (0.10 mol L-1 Bu4NClO4) and the potential is scanned or stepped to significantly negative potentials, very fast dissolution processes of the kind C60(solid) + ne-fast C60n-(soln) (n = 3-5) occur. In contrast, one- and two-electron reductions only lead to a minor level of dissolution of C60- and C602-. Electrochemical quartz-crystal microbalance studies on gold electrodes revealed that C602-(solid) and C60-(solid) are intermediates in the n ≥ 3 reduction-dissolution processes and that a range of adsorption and precipitation steps occur when the dissolved material is oxidized back to C60(solid). The exact details of the mechanism of the process that occur after reduction of C60(solid) to dissolved C60n-(soln) (n = 3-5) under conditions of cyclic voltammetry depend on the scan rates, electrode material, and switching potentials employed. However, under carefully chosen conditions at a glassy carbon electrode, reaction schemes of the kind C60(solid) + 5e- → C605-(soln) and C605-(soln) ⇌-e-+e- C604-(soln) ⇌-e-+e- C603-(w/ad) ⇌-e-+e- C602-(w/ ad) ⇌-e-+e- C60- (w/ad) are operative, where the symbol "w/ad" represents weak adsorption. However, the strength of adsorption increases on the order of C60- ≫ C602- > C603- > C604- > C605-, so that strong adsorption and even solid formation occur under other conditions and only fully surface confined C60(solid) could be detected. The relationship between dissolution, adsorption, and surface attachment processes that accompany the voltammetry of C60 has been identified.

Original languageEnglish
Pages (from-to)2320-2329
Number of pages10
JournalJournal of Physical Chemistry B
Volume104
Issue number10
DOIs
Publication statusPublished - 16 Mar 2000
Externally publishedYes

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