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中文摘要：
通过物理、电化学手段，对Pt粒径分别为1．5nm、2．3nm和3．3nm的Pt／C催化剂的活性和稳定性进行了考察。经过500次电势扫描[O．6-1．2V（vs．NHE）]后，3种催化荆的电化学活性面积（ECA）分别衰减为初始值的15％、19％和25％；扫描电势为0．9V时，单位ECA的电流密度分别上升为初始值的1．84倍、1．40倍和1．34倍。
英文摘要：
The oxygen reduction reaction activity and durability of Pt/C catalysts with Pt particle size of 1.5 nm,2.3 nm and 3.3 nm were studied by physical and dactrochemieal methods. After 500 cycles of potential scan[0.6 - 1.2 V（ vs. NHE） ], the dectrochemical active area（ECA）of 3 kinds of catalyst was degraded to 15%, 19% and 25% of the initial value, respectively. The ECA specific current density increased to 1. 84 times, 1.40 times and 1. 34 times at the scan potential of 0.9 V.
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