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The potential-dependent CO adsorption in both H 2 adsorption/desorption region and double layer region on polycrystalline platinum at room temperature and the oxidation of the adsorbed CO have been systemically studied. PEM-FTIR (Photon Elastic Modulation FTIR) technique along with cyclic voltammetry was used to understand the adsorption state and the mechanism of CO oxidation. In the hydrogen adsorption-desorption region of the smooth platinum surface, three types of adsorption states weredoi:10.1149/1.2214627 fatcat:llals2hxrjb7nbocoeqzbyfg4m