Redox reaction of quinones at a silver-deposited gold electrode in acetonitrile and aqueous solutions

摘要

Silver-deposited gold electrodes were prepared in order to investigate the role of deposited silver onto a gold electrode in the electrochemical behavior of p-benzoquinone at the electrode. Using the electrodes as a working electrode, the electrochemical behavior of p-benzoquinones was examined in acetonitrile and aqueous solutions. In the acetonitrile solution, cyclic voltammograms for p-benzoquinone derivatives were measured and the relations between the potentials of the second-redox peak and the sum of Hammett's sigma value were examined. A potential-pH diagram was obtained for p-benzoquinone in an aqueous solution. Both relations were also obtained at other solid electrodes. The mechanism for a redox reaction at a silver-deposited gold electrode was considered based on a comparision of the observation data at the electrode with different materials.