质子交换膜燃料电池电极的一种新的制备方法

A New Method for the Preparation of the Electrodes with Very Low Platinum Loading Used in Proton Exchange Membrane Fuel Cell

提出一种新的电极制备方法 ,在薄层催化层电极制备中加入造孔剂 ,并使用喷涂方法 ,使质子交换膜燃料电池 (PEMFC)电极中铂担量降到 0 .0 2mgPt/cm2 .与文献方法相比 ,新方法过程简单、成本低、易放大 .并通过实验得到电极的最佳组成为 :催化剂 :造孔剂 :Nafion =3:3:1 .采用此方法制备的电极 (0 .0 2mgPt/cm2 )与Nafion 1 1 5膜组装成电池 ,单池工作电压为 0 .7V时 ,每毫克铂可产生 2 0A的电流 ,每千瓦电池组仅需 72mgPt .

Research and development on low platinum loading electrode is very important in reducing the cost of proton exchange membrane fuel cell(PEMFC)stack.This paper has put forward a new method to prepare the electrode of PEMFC. The pore forming substances were used in this methd. The low platinum loading electrodes (0.02 mgPtcm -2 )have already been prepared with the method. Compared with the traditional method, the new method is simple, cheep, and easy to scale up. The superior composition of the electrodes is catalyst: pore forming substance: Nafion= 331. The performance of a single cell using this kind of electrodes and Nafion 115 membrane can reach 500 mA/cm 2 at 0.7 V with 0.5 MPa H 2/O 2 operated at 80 ℃. If this kind of electrodes and Nafion 115 membrane are made up fuel cell stacks, the platinum loading per kW only needs 72mg.