Hello,
Generally, the bare glassy carbon electrode (GCE) does not show any peak for the reduction of Hydrogen peroxide at the potential window of -0.1 V to -1.2 V. On the other hand, metal nanoparticles such as Au, Ag, Pt and Pd modified GC electrodes show the response of hydrogen peroxide at the said potential window. Is there any particular reason behind this activity?
Few papers have been reported the Ag or Au nanostructures as artificial enzyme mimetics. But there is no clear evidence for this statement in their papers.
People working in this field please share your valuable comments if you know.
H2O2 is not stable material and the presence of various impurities can easily decompose it. As mentioned above, metals tend to be oxidized in contact with oxidizing agents. Hydrogen peroxide is a strong oxidant in acidic media and will be reduced by many metals especially when the metals are in nano dimension. If the solution is not acidic the presence of some metals, such as Ag NPs, can decompose H2O2 to give oxygen gas.
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