Effect of Oxygen Evolution on Platinum Dissolution in Acidic Solution

抄録

In the present study, we confirmed the enhancement of Pt dissolution during an oxygen evolution reaction (OER). In situ analysis using a channel flow double electrode showed anodic dissolution during the OER and cathodic dissolution from the reduction of Pt oxide. Pt dissolution during the OER showed transient dissolution behavior. Initiation of the OER triggered anodic Pt⁴⁺ dissolution; however, the dissolution was strongly inhibited by the development of oxides. Reduction of oxides formed in the OER region required lower potential than those formed below 1.5 V. The lower reduction potential increased the reduction rate of oxides and enhanced the instantaneous dissolution rate of Pt²⁺.