The Influence of Fluoride Media and CH3CN on the Voltammetric Behavior of Ferrocene, Quinhydrone, and Methyl Phenyl Sulfide on Pt and Carbon Electrodes

Abstract

Cyclic voltammetric behavior of ferrocene, quinhydrone, and methyl phenyl sulfide on Pt, glassy carbon (GC) and polypropylene composite graphite (CPP) electrodes are compared in TBAP/CH3CN, triethylamine (TEA).3HF/CH3CN and TEA.3HF media. In medium containing CH3CN, the voltammetric behavior of title compounds are quite similar in the absence and presence of fluoride ions. The voltammetric features vary only slightly, due to some adsorption effects and catalytic hydrogen evolution on Pt. In TEA.3HF medium, all three electrodes show significantly higher background currents in the middle potential region itself. The peak potential and the charge transfer rate constant of these compounds are also found to be significantly different in TEA.3HF room temperature melt. The analytical implications of these medium effects are also discussed.

Electrochemical characterisation of patterned carbon nanotube electrodes on silane modified silicon

“…The potential for patterned carbon nanotube electrodes to provide an alternative to existing electrode systems can be seen upon comparison of the observed rate constant with literature values. Noel et al [28] have used platinum, glassy carbon and polypropylene composite graphite electrodes in ferrocene solutions and obtained rate constants of 5.1 × 10 −3 , 4.5 × 10 −3 and 3.3 × 10 −3 cm s −1 , respectively which are comparable to the values obtained in this work.…”

Antimicrobial and antioxidant activities and chemical profiling of Curvularia tsudae endophytic in Cynodon dactylon (L.) Pers

“…Indication of good antioxidant activity in the extract is associated with the predominant presence of flovonoid and phenolic compounds (Sochor et al 2013). Noel et al (2000) and Simić et al (2007) also proved that compounds with strong scavenging capacity oxidize relatively at low potential. Further, the shifting of anodic peak potential towards the positive value was shown to possess the scavenging oxygenfree-radicals in the extract (Keffous et al 2016).…”

“…The incubated plates were arranged in complete randomized design and the triplicate data were analyzed to determine the colonization frequency (%) of fungal isolates and diversity and evenness indices and species richness of endophytic fungal isolates (Simpson and Shannon) (Suryanarayanan et al 2000) and antimicrobial activity (Duncan's multiple range test, P < 0.05, Chen et al 2010a).…”

Electrochemistry of metals and semiconductors in fluoride media

“…Even glassy carbon and polypropylene composite graphite electrodes (CPP) can be used in voltammetric measurements to study a wide variety of electrochemical processes [85]. The solvent used, however, can influence the quantitative voltammetric responses, the concentration and the nature of fluorine based supporting electrolyte [86]. Hence caution must be exercised when these electrodes are used in aqueous and non-aqueous solvents containing supporting electrolyte anions such as BF À 4 , ASF À 6 and PF À 6 .…”

“…In this respect, Pt is similar to GC [86]. A large number of voltammetric investigations have been carried out in fluoride containing acetonitrile (CH 3 CN) medium in early work on selective fluorination [14,128].…”