Substituent effects on the electrocatalytic reduction of oxygen on quinone-modified glassy carbon electrodes

Approach to Microbial Fuel Cells and Their Applications

“…On modification of the quinone substituents, the redox potential of the surface couple shifts, following its particular HOMO-LUMO (highest occupied-lowest unoccupied molecular orbital) orbital energy. By selecting the appropriate quinone derivative, the reduction of oxygen can take place at more positive potentials on the modified electrodes [73]. Perhaps this strategy could be transferred to the bacterial layers, because conditioning at different potentials leads to the observation of different redox processes as noted previously (Fig.…”

An overview of the electrochemical reduction of oxygen at carbon-based modified electrodes

“…A better method of modification of carbon electrodes is through covalently binding of quinone to the carbon surface [6,22,98], but the procedures of grafting are often not simple. Several authors [6,[22][23][24]41,99] have employed modification of carbon electrodes with quinones by the electrochemical reduction of appropriate diazonium salts of quinones, i.e. by cycling potential in a nonaqueous solution of quinone diazonium salt, reactions (28) and (29):…”

“…The carbon surfaces were modified by the electrochemical reduction of appropriate diazonium salt with different quinones, for instance anthraquinone [22,23,41,99] and phenanthraquinone [6,24]. It was shown that grafting of quinones on glassy carbon leads to a significant improvement of the rate of oxygen reduction to hydrogen peroxide as evidenced by the shift of the reduction peak potential to more positive values and increase of the reduction peak current.…”

“…The RRDE results confirmed that electroreduction of oxygen at anthraquinone-modified glassy carbon electrode stops at peroxide stage. Therefore, it was established that grafting of glassy carbon surface with anthraquinone results in electrocatalytic active surface for the reduction of oxygen to hydrogen peroxide [22,23,41,99].…”

Anthraquinone modification of microporous carbide derived carbon films for on-chip micro-supercapacitors applications

“…The grafting of quinones has been extensively studied in the literature as they allow a two electron transfer during reduction process [29,30]. Chemical grafting of quinones was performed on glassy carbon [31], carbon nanotubes (CNTs) [32], onion-like carbons (OLCs) [33], graphite [34], CVD grown graphene [35] and porous carbons [36][37][38] in order to improve the performance of these EDLCs electrodes.…”