The　possible　role　of　platinum　in　the　carbon　corrosion　at　cell　voltage　higher　than　1.0　V　is　controversial　yet.　To　gain　more　insights　into　this　issue,　a　square-wave　potential　cycles　between　1.0　to　1.5　V　was　applied　to　fuel　cells　comprising　cathodes　with　and　without　Pt.　Using　online　non-dispersive　infrared　spectroscopy,　we　showed　that　Pt　catalyzed　the　gasification　of　carbon　in　the　early　stage,　while　upon　prolonged　exposure　to　potential　cycling　(＞=　3　h),　platinum　started　to　hinder　the　CO2　production.　Based　on　cyclic　voltammetry　tests　and　Raman　spectroscopy,　the　inhibiting　effect　of　platinum　on　the　corrosion　was　suggested　to　originate　from　modifications　on　carbon　surface,　where　the　formation　of　electroactive　sites　was　limited.　Electrode　and　non-electrode　ohmic　resistances　were　distinguished　further　through　electrochemical　impedance　spectroscopy　measurement　and　the　changes　in　electrode　microstructure　and　surface　composition　were　examined　by　scanning　electron　microscope　image　and　energy　dispersion　X-Ray　spectroscopy.　The　results　indicated　that　Pt　reduced　the　damage　of　electrode　structures　after　potential　cycles.