Selective covalent immobilization of catechol on activated carbon electrodes

Nanocrystalline graphite-like pyrolytic carbon films as electrodes for electrochemical sensing application

“…S9 shows background cyclic voltammograms obtained in supporting electrolyte solution immediately after conducting cyclic voltammetry experiments in hydroquinone solution followed by rinsing the surface of electrode by distilled water for 3 min. The appearance of the reversible peaks attributed to the surface adsorbed hydroquinone molecules for the electrode anodized at 1.9 V and 2.1 V confirms the strong adsorption of hydroquinone molecules probably through covalent bonding with the surface oxide functional groups, specifically hydroxyl groups, similar to that observed and suggested by Kumar et al [45] for the anodized glassy carbon electrode in a catechol solution. Anodization at lower applied potentials causes moderate formation of surface oxide groups that lowers the DE p value and increases the peak current (I p ) due to the weakly adsorbed hydroquinone molecules on the oxidized carbon surface presumably through hydrogen bonding between the hydroquinone molecules and the generated surface oxide functional groups.…”

A New Catechol Biosensor Immobilized Polyphenol Oxidase by Combining Electropolymerization and Cross-Linking Process

“…Many efforts are currently focused on the development of simple and more efficient methods for the detection of catechol. In particular, catechol biosensor has received considerable attention in recent years [7] due to its simplicity, low cost, high sensitivity, good selectivity, and ease of operation [8,9]. For the fabrication of biosensors, it is very important to choose the appropriate preparation method and film matrix for immobilizing enzymes [10,11]; these factors can directly affect the activity, stability as well as other performance of the biosensor [12].…”

MnO2 as ink material for the fabrication of supercapacitor electrodes

“…SI-2c) is rather complex, especially in comparison with those of Mn-oxide/free and Mn-oxide/SDS. Although, the peak at 529.325 eV can unambiguously be assigned to the Mn-O bond from manganese oxide, the other peaks at 530.025, 530.900 and 531.800 eV are characteristic of adsorbed moieties: OH groups from adsorbed cathecol, Mn-OH, and residual coordinated water, respectively[43][44][45]. The lowest average oxidation state in the series is calculated at 3.4 for Mn-oxide/TX100.…”