Overoxidized Polypyrrole/Cobalt Tetrasulfonated Phthalocyanine Modified Ultramicro‐Carbon‐Fiber Electrodes for the Electrooxidation of 2‐Mercaptoethanol

Inverted correlations between rate constants and redox potential of the catalyst for the electrooxidation of 2-aminoethanethiol mediated by surface confined substituted cobalt-phthalocyanines

“…Reported studies have shown that the catalytic activity of the adsorbed phthalocyanines-coated electrodes strongly depends on the nature of the central metal, with cobalt derivatives giving the best results [2]. Also, extended studies reported on the use of electropolymerized cobalt phthalocyanine films as long term stable materials for elaborating electrochemical sensors for thiols [19,21].…”

“…The correlations are linear and the slopes are ranging between 0.081 and 0.11 V per decade. The obtained values suggest that the transfer of a first electron is rate determining and this agrees with previous results obtained for the oxidation of other thiols [11][12][13][14][15][16][17][18][19][20][21] but the symmetry factor is higher than 0.5. It varies between 0.53 and 0.73 depending on the complex.…”

Non-enzymatic glucose biosensor based on overoxidized polypyrrole nanofiber electrode modified with cobalt(II) phthalocyanine tetrasulfonate

“…Despite these disadvantages, the overoxidized PPy (OPPy) has been used in some electroanalytical applications, which utilize its permselectivity (Shiigi et al, 2002;Spurlock et al, 1996). Gulppi et al (2001) combined the use of electrochemically formed PPy-doped cobalt(II) phthalocyanine tetrasulfonate (CoPcTS) with ultramicrocarbon-fiber electrode configuration to achieve the electrocatalytic oxidation of 2-mercaptoethanol in alkaline aqueous solution and provided a miniaturized electrochemical sensor that was easily fabricated from low cost materials.…”

Comparative study of electropolymerized cobalt porphyrin and phthalocyanine based films for the electrochemical activation of thiols

“…Only few attempts have been reported to attempt to develop the use of multilayered-based metallophthalocyanine films for the activation of thiols, to offer a better alternative to the design of efficient and stable electrocatalysts. [9][10][11][12][13][14] In this context, in a recent work we explored the electrocatalytic activity of electropolymerized cobalt tetraaminophthalocyanine (CoTAPc, see structure in Fig. 1) films for the oxidation of 2-mercaptoethanol (2-ME) 14 and reported a comparative study of these chemically modified electrodes as a function of CoTAPc film thickness.…”