Enhanced electrocatalytic reduction of oxygen with a molecule having multi-quinone moieties adsorbed in the nanofiber film

An anthraquinone moiety/cysteamine functionalized-gold nanoparticle/chitosan based nanostructured composite for the electroanalytical detection of dissolved oxygen within aqueous media

“…27 Various reports are available for using anthraquinones and their derivatives as redox mediators for horseradish peroxidase in hydrogen peroxide sensors 28,29 and oxygen reduction/dissolved oxygen detection. 23,27,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] The probable mechanism for the role of anthraquinones and their derivatives is reported to be as follows: 45 Step (I): formation of quinone radical anion…”

An oxygen amperometric gas sensor based on its electrocatalytic reduction in room temperature ionic liquids

“…In fact, reduction products of species undergoing cathodic reactions at less negative potentials than O 2 are of course thermodynamically unable to cause its reduction in homogeneous phase. Thus, attempts of electrocatalysing oxygen reduction by compounds profitably adopted in protic media, such as porphyrin or phenanthroline complexes [28][29][30], as well as usual compounds containing quinone moieties [31][32][33][34][35][36], are expected to fail completely. In fact, in protic media, unlike in RTILs, a marked decrease of the O 2 formal standard potential is caused by the occurrence of fast chemical reactions with protons, following the primary one electron uptake.…”

Electrochemical Pretreatment of Graphene Composite CNT Encapsulated Au Nanoparticles for H2O2 Sensor

“…It has been reported that, the electrochemical pretreatment of glassy carbon electrode could improve its electrochemical behavior by greatly increasing the active surface area of the pretreated electrode which therefore enhanced its electrocatalytic performance and electrical conductivity . In this context, an electrochemical pretreatment of G/CNT nanocomposite employing potentiostatic technique was carried out for the first time in order to activate the nanocomposite structure through increasing their active surface area which may therefore act as an immobilizing matrix for highly adsorption of AuNPs that was further employed for analytical application of H 2 O 2 sensor .…”