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Attempts to modify an electrode with a conducting platinum cluster compound
Author(s) -
Xu Liang,
Li Fenglei,
Dong Shaojun
Publication year - 1995
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.1140070808
Subject(s) - cyclic voltammetry , platinum , electrode , working electrode , voltammetry , electrochemistry , glassy carbon , aqueous solution , chemistry , analytical chemistry (journal) , materials science , ultramicroelectrode , inorganic chemistry , catalysis , organic chemistry
A conducting platinum cluster compound K 1.64 Pt(C 2 O 4 ) 2 was electrochemically synthesized on a glassy carbon electrode through the electrooxidation of K 2 Pt(C, 2 O 4 ) 2 in an aqueous medium using single potential step and cyclic voltammetry methods. The precursor K 2 Pt(C 2 O 4 ) 2 was prepared by a ligand exchange reaction between C 2 O 4 2− and PtCl 4 2− . During single potential step experiments, the electrolytic current corresponding to the oxidation of K 2 Pt(C 2 O 4 ) 2 increased dramatically after a sharp decrease at the beginning (due to the formation of conducting K 1.64 Pt(C 2 O 4 ) 2 on the surface of the working electrode). Two kinds of mechanism account for the current transients at the different applied potentials. Cyclic voltammetry was conducted with K 1.64 Pt(C 2 O 4 ) 2 on the surface of the working electrode and a steady‐state diffusion current was observed. Since the material grew in a fibrous manner, each conducting fiber which was in contact with the electrode could serve as an ultramicroelectrods. The behavior of the working electrode was thus changed from a plain to an ultramicroelectrode array.