Effect of H2O2 on Pt electrode dissolution in H2SO4 solution based on electrochemical quartz crystal microbalance study

► The Pt dissolution is accelerated by potential scanning in H2O2-containing H2SO4. ► The Pt dissolution in the presence of H2O2 depends on the electrode potential and the H2O2 amount. ► The potential scanning time affects the Pt dissolution phenomenon in H2SO4 containing H2O2. ► H2O2 contributes to the Pt-oxide formation causing the cathodic Pt dissolution. ► H2O2 also participates in the anodic Pt dissolution and the chemical Pt dissolution.