异型Ti电极直接乙醇燃料电池的制备与性能

Preparation and cell performance of special-shaped Ti electrode for direct ethanol fuel cell

采用Pt/C作为阴极催化剂,PtRu/C作为阳极催化剂,Nafion115和Nafion液涂覆膜作为质子交换膜,管状Ti丝(管)和平板式Ti网作为制备异型直接乙醇燃料电池的阴极和阳极的载体材料,制备管状阴极和平板阳极.观察了异型阴极和阳极的组织和结构,并通过单电池试验,研究了异型电极对直接乙醇燃料电池(DEFCs)性能的影响.结果表明,管状阴极涂覆的Nafion膜均匀一致,阳极催化剂与Ti网的结合能力较强,较高的O2流量有利于提高DEFCs单电池的性能,当膜载量达到25.0 mg/cm2以上时,会提高DEFCs单电池阻抗,当膜载量小于20.2 mg/cm2时,电池的使用寿命大大降低.

Tubular cathode and planar anode were prepared with Ti capillary and Ti mesh plate,which were used as the cathode and anode substrates of direct ethanol fuel cells（DEFCs）,respectively.Pt/C was used as cathode catalyst,PtRu/C was used as anode catalyst,Nafion solution recasting membrane and Nafion115 were used as proton exchange membrane.The microstructures of the special-shaped cathode and anode were studied.The effect of abnormal electrodes upon DEFCs was studied through single cell test.The result shows that the recasting Nafion menbrane of the tubular cathode is uniform and anode catalyst layer is strongly combined with Ti mesh,and that the single cell performance of DEFCs can be enhanced by higher flow rate of O2.When the loading of Nafion membrane is ≥25 mg/cm^2,the impedance of DEFCs would be enhanced.However,when the loading of Nafion membrane is ≤20.2 mg/cm^2,the life of DEFCs would be shortened greatly.