Effect of Scan Range on Pt Surface Area Loss in Potential Cycling Experiments

Effect of upper and lower potential limits on Pt stability in potential cycling experiments is studied for 20 wt. % Pt/C E-TEK catalyst in acidic medium. The Pt electrochemical surface area (ECSA) loss is observed as a parameter to study different potential ranges. It is observed that at upper potential limits the ECSA loss is influenced by electrochemical Pt dissolution while at lower potential limits reduction of β Pt oxide phase plays important role in ECSA loss.