摘要
使用加热喷涂技术代替传统室温喷涂法制备立体化层,将立体化层引入直接甲醇燃料电池(DMFC)用膜电极组件(MEA)的结构中,优化立体化层中的Nafion载量,以增大催化层和质子交换膜之间的结合力,减少缝隙,进而降低电池内阻和物料传质阻抗。交流阻抗谱(EIS)和极化曲线证明:立体化层Nafion离子聚合物的最佳载量为0.6 mg/cm2;立体化处理的MEA较传统MEA的功率密度峰值提高19.46%;加热立体化技术将电池性能在55℃下提高到151.2 mW/cm2,机理是在进一步降低电池欧姆阻抗的同时,增大了催化层的活性面积。
The heated-spray method was used to prepare three-dimensional layer, three-dimensional layer was introduced into the traditional membrane electrode assembly（MEA） structure of direct methanol fuel cell（DMFC）, the loading of Nation was optimized for thrce-dimensional layer increased the binding force between catalyst layers and proton exchange membrane, reduced the gap, reduced the internal resistance and mass transfer resistance. Electrochemical impedance spectroscopy （EIS） and polarization curves showed that the optimal loading of Nation for three-dimensional was 0.6 mg/cm2. In comparison with traditional MEA, the novel MEA with three-dimensional layer exhibited higher performance with 19.46% increase in maximum power density during single cell test. The performance of the MEA which was prepared by heating three-dimensional technology further increased to 151.2 mW/cm2 at 55℃, due to the larger active surfaces of the catalyst layers and smaller ohmic impedance of the cell.
出处
《电池》
CAS
CSCD
北大核心
2012年第2期66-69,共4页
Battery Bimonthly
基金
863项目(2006AA03Z224
2007AA05Z150)
国家自然科学基金(50528404)
