DMFC放电模式与性能稳定性研究  

Study on discharging mode and performance stability of DMFC

作　　者：魏浩杰 姜颖[2] 王慢想[3] 刘桂成 

机构地区：[1]中国循环经济协会,北京100037 [2]唐山工业职业技术学院,河北唐山063020 [3]北京林业大学环境科学与工程学院,北京100083 [4]韩国科学技术研究院能源融合研究中心

出　　处：《电池》2016年第1期4-7,共4页Battery Bimonthly

基　　金：韩国科技部国家研究基金ICT&Future(NRF-2015H1D3A1036078)

摘　　要：不同放电模式下CO2气体传质对催化层结构稳定性和催化剂电化学稳定性的影响,导致在较长时间运行中直接甲醇燃料电池(DMFC)性能稳定性的不同。DMFC的性能在恒压放电模式下比恒流模式、恒功率放电模式下更稳定。用恒压不间断放电模式进行寿命测试后,电池的输出功率密度减至初始值的15.08%,采用循环伏安法除去阴极催化剂上的吸附物,可部分恢复电池性能。电化学阻抗谱(EIS)分析表明:性能不可逆衰减的主要原因是阳极催化层结构的破坏。The influence of different discharging modes on the direct methanol fuel cell（ DMFC） performance was studied. Different discharging modes had different effects in mass transfer of CO_2,the stability of catalyst layers and the electrochemistry performances of DMFC. This led to the difference in the fuel cell stability during lifetime test. DMFC would have a better performance under potentiostatic discharging mode than those of galvanostatic discharging mode and constant power discharging mode. The fuel cell power density was reduced to 15. 08% of its initial value after life test under continuous potentiostatic discharging mode. After removing the adsorbates on cathode catalyst through cyclic voltammetry method,part of the cell＇s performance was recovered. The irreversible degradation mechanism of DMFC performance was analyzed through electrochemical impedance spectroscopy（ EIS）technique,and was main from the damage of the anode catalyst layer structure.

关 键 词：直接甲醇燃料电池(DMFC) 膜电极 性能稳定性 放电模式 

分 类 号：TM911.4[电气工程—电力电子与电力传动]