Electrode catalysts behavior during direct ethanol fuel cell life-time test

Luhua Jiang, Gongquan Sun, Suli Wang, Guoxiong Wang, Qin Xin, Zhenhua Zhou, Bing Zhou
2005 Electrochemistry communications  
In the present paper, a 60 h life-time test of a direct ethanol fuel cell (DEFC) at a current density of 20 mA cm À2 (the beginning 38 h) and 40 mA cm À2 (the last 22 h) was carried out. After the life-time test, the MEA could not achieve the former performance. X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX) were employed to characterize the anode and cathode catalyst before and after the life-time test. The XRD and TEM results showed
more » ... hat the particle size of the anode catalyst increased from 2.3 to 3.3 nm and the cathode from 3.0 to 4.6 nm. The EDX results of PtSn/C anode catalysts before and after the life-time test indicated that the content of the oxygen and tin, especially the content of the platinum, decreased prominently after the life-time test. The results suggest that the agglomeration of electrocatalysts, the destruction of the anode catalyst together with the fuel/water crossover from anode to cathode concurrently contribute to the performance degradation of the DEFC.
doi:10.1016/j.elecom.2005.04.021 fatcat:2fjjxzwftrdghobxkypcroeaia