新型自增湿膜电极的制备及其燃料电池性能

质子交换膜燃料电池 (PEMFC)是以环境友好的方式输出高功率密度的电能 ,有望应用于动力电源、家用电源、通信电源及便携式电源等领域 [1] .在 PEMFC的应用开发中 ,成本正在逐渐降低 ,各种贮氢系统也相继出现 .然而要使 PEMFC实现产业化还必须简化复杂的运行系统 ,提高电池的功率体积比与功率质量比 .为此 ,自增湿 PEMFC被视为最有希望的燃料电池应用技术 .自增湿膜电极是实现自增湿技术的根本途径 .Watanabe等[2 ] 首先提出用 Pt微粒与 Si O2 或 Ti O2 掺杂在电解质膜中制备自增湿 MEA,Pt微粒有效地阻止了氢氧的交叉扩散 ,并在…

A Novel Preparation for a Self-humidifying Membrane Electrode Assembly and Performance of Its Fuel Cell

A novel method for the preparation of a self-humidifying MEA used for PEMFC and the optimum conditions for the fabrication are presented. Different from the method involved dispersion of Pt particles through out the membrane or between two thin membranes. The new type self-humidifying MEA gain self-humidifying operation by asymmetry electrode. The anode with 0.1 mg Pt/cm 2, has super-hydrophilicity by coating the hydrophilic colloid, while the cathode with 0.4 mg Pt/cm 2, has a strong hydrophobic nature by doping PTFE. When the current density is less than 2.3 A/cm 2, the discharge performance of the humidifying gases little excel the self-humidifying operation, but more than 2.3 A/cm 2, the self-humidifying operation do better than humidifying gases operation, and the most power density reaches over 1.5 W/cm 2. Inner resistance of electrochemistry reaction and transportation are studied by the AC impedance method, and validate that the self-humidifying MEA can give a good three-dimension reaction area with dry hydrogen and dry oxygen.