转印法制备质子交换膜燃料电池膜电极组件

Preparation of membrane electrode assemblies by decal method for PEMFC

转印法是一种间接将催化层涂布在质子交换膜上的膜电极组件制备方法,其制备工艺简单,周期短,且制备过程中质子交换膜不与任何溶剂接触,有效避免了膜的溶胀问题。采用刮刀涂布技术,将催化剂浆料均匀地涂布于转印膜上,调节刮刀间隙与刮刀运行速度可有效地控制金属催化剂的载量。扫描电子显微镜法(SEM)测试表明转印后的催化层表面形貌完整、孔隙分布均匀,膜电极各组件之间结合紧密且厚度一致。将该工艺制备的膜电极组装成单电池,测试结果表明:在阴、阳极Pt载量分别为0.463、0.264 mg/cm2条件下,以空气作为阴极反应气体的单电池在常压下的最大功率密度可达0.75 W/cm2。

Decal method as one of the membrane eletrode assembly （MEA） fabrication methods indirectly coating catalyst layer on the proton exchange membrane, its manufacturing possesses are easy, and the cycle is short, and it doesn＇t contact with solutions to effectively avoid the dissolving and swelling problems. Catalyst ink was uniformly coated on the transfer film by doctor blading coating technology and Pt loading was effectively controlled by altering gap and movement speed of the scraper. SEM images show that the surface morphology of catalyst layers after decaling is complete, and the pore gap is well-distributed, and each assembly of MEA tightly bonds, and the thickness is uniform. While assembling the prepared MEA to a single cell in which air was the reactant gas for the cathode, the maximum power density under normal pressure reaches up to 0.75 W/cm2on condition that Pt loading quantity of cathode and anode are respectively 0.463 and 0.264 mg/cm2.