中文摘要：

针对阴极通纯氧气或空气两种情况，实验研究了温度及化学计量比的变化对反应面积为9cm^2、具有平行流场的PEMFC性能的影响。结果表明：升高电池温度可提高PEMFC的性能及极限电流密度；在本实验条件下，为提高电池性能，阴极通纯氧时，阳极化学计量比／阴极化学计量比应高于1．5／3．0，通空气时，两者之值应高于3．0／6．0；相对于阴极通空气的情况，阴极通氧气时电池性能显著提高，故在条件允许的前提下应尽量以纯氧作为氧化气体。

英文摘要：

The performance of PEMFC with pure oxygen or air as oxidant is experimentally compared. The reaction area of the PEMFC is 9 cm^2, and the conventional parallel flow field is used. The experimental results show that the performance and limited current density of the PEMFC are enhanced with increasing operational temperature. Under the condition of present experiment, the anode stoichiometry/cathode stoichiometry should be larger than 1.5/3.0 with oxygen as oxidant, and the two parameters should be larger than 3.0/6.0 with air as oxidant. Compared with the condition of air as oxidant, the PEMFC performance can be significant improved with pure oxygen as oxidant. Therefore, it is suggested that the pure oxygen should be the preferred oxidant.