直接甲醇燃料电池无担载阳极制备新方法

New fabrication method of unsupported anode in direct methanol fuel cell

提出了一种新的直接甲醇燃料电池(DMFC)无担载阳极制备方法,其特征是先用催化剂前体与聚合物电解质的溶液涂制电极,再将成形的电极中的催化剂前体还原成金属。实验结果表明,新方法所制无担载PtRu电极中Nafion的最佳含量为10%,催化剂的粒度为3～4nm;电极甲醇氧化性能优秀,在90℃、催化剂载量3.7mg/cm2Pt+2mg/cm2Ru、极化电势为0.35V的条件下可获得360mA/cm2的阳极性能。将采用新方法制得的无担载PtRu电极组装成DMFC单电池,在90℃,阴极O2压强为2.02×105Pa的条件下,电池可获得207mW/cm2的输出功率。

We developed a new fabrication method of unsupported anode in DMFC. The characters of the method are firstly casting a raw electrode using a solution containing polymer electrolyte and catalyst precursors, then reducing the precursors in the electrode into catalysts. Experimental results show that the unsupported electrode thus prepared has high porosity, the opti- mal Nation content in the electrode is 10% and the catalyst particle size is 3-4 nm; when working at 90 ℃, the electrode with its catalyst loading 3.7 mg/cm^2 Pt＋2 mg/cm^2 Ru shows good performance of 360 mA/cm^2 at 0.40 V, DMFC with the unsupported anode prepared by this method could achieve the maximum power density of 207 mW/cm^2 at 90 ℃ under the operation condition of non-humidified O2 pressurized to 2.02 ×10^5 Pa.