Electrochemical reduction of oxygen on anthraquinone/carbon nanotubes nanohybrid modified glassy carbon electrode in neutral medium

The electrochemical behaviors of monohydroxy-anthraquinone/multiwall carbon nanotubes (mhaq/mwcnts) nanohybrid modified glassy carbon (mhaq/mwcnts/gc) electrodes in neutral medium were investigated; also reported was their application in the electrocatalysis of oxygen reduction reaction (orr). the resulting mhaq/mwcnts nanohybrid was characterized by scanning electron microscope (sem) and transmission electron microscope (tem). it was found that the orr at the mhaq/mwcnts/gc electrode occurs irreversibly at a potential about 214 mv less negative than at a bare gc electrode in ph 7.0 buffer solution. cyclic voltammetric and rotating disk electrode (rde) techniques indicated that the mhaq/mwcnts nanohybrid has high electrocatalytic activity for the two-electron reduction of oxygen in the studied potential range. the kinetic parameters of orr at the mhaq/mwcnts nanohybrid modified gc electrode were also determined by rde and eis techniques. © 2013 zheng gong et al.