通过向阳极催化层中添加高分子化合物亲水剂，制备了一种具有自增湿能力的膜电极。考察了亲水性高分子化合物的种类、相对湿度（RH）以及电池温度对膜电极自增湿性能的影响，并初步探索了膜电极的自增湿机理。结果表明，以羧甲基纤维素（CMC）为保水剂的膜电极表现出最好的低湿度性能；膜电极的自增湿性能受相对湿度影响不大，但随着温度的升高，其性能先升高后降低；在电池温度为60℃、20% RH、206 kPa条件下，以羧甲基纤维素为保水剂的膜电极在0.6 V的电流密度为 900 mA/cm²，是空白膜电极的1.8倍。

A self-humidifying membrane electrode assembly (MEA) is successfully prepared through adding hydrophilic macromolecular compound into the catalyst layer of anode.The effects of the variety of hydrophilic macromolecular compound,relative humidity (RH) and cell temperature on the self-humidifying performance of the MEA are investigated,and its self-humidifying mechanism is explored primarily.The results show that the self-humidifying MEA prepared by using carboxymethyl cellulose (CMC) as hygroscopic agent exhibits the best low humidity performance;RH has little influence on MEA's self-humidifying performance.The current density of CMC-containing MEA can reach 900 mA·cm^-2 at 0.6 V,1.8 times that of blank MEA when RH is 20%,the temperature and pressure of the cell is 60℃ and 206 KPa,respectively.

黎杰鑫(1998-),男,大学,2889787617@qq.com