An extraordinary electrocatalytic reduction of oxygen on gold nanoparticles-electrodeposited gold electrodes |
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| Institution: | 1. The Key Lab of Health Chemistry & Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China;2. School of Public Health, Nantong University, Nantong 226019, PR China;1. Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, ROC;2. Post Graduate and Research Department of Chemistry, Thiagarajar College, Madurai-625009, Tamilnadu, India |
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| Abstract: | The cathodic reduction of oxygen has been investigated at a gold nanoparticles-electrodeposited gold electrode in 0.5 M H2SO4 solution. Two well-defined reduction peaks were observed at +50 and −250 mV vs. Ag/AgCl/KCl (sat.). Those two peaks indicated a 2-step 4-electron reduction pathway of O2 in this strong acidic medium. The former peak was ascribable to the 2-electron reduction of O2 to H2O2, while the latter was assigned to the reduction of H2O2 to H2O. The observed electrocatalysis for the reduction of O2 is attributable to the extraordinary catalytic activity of the gold nanoparticles over the bulk gold electrode, at which the 2-electron reduction peak of O2 to H2O2 was observed at −200 mV. |
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