阳极
材料科学
介电谱
阴极
电催化剂
极化(电化学)
电化学
化学工程
能量色散X射线光谱学
电极
直接甲醇燃料电池
扫描电子显微镜
分析化学(期刊)
复合材料
化学
有机化学
物理化学
工程类
作者
Junsong Guo,Gongquan Sun,Zhaopeng Wu,Shi‐Gang Sun,Songhua Yan,Lei Cao,Yushan Yan,Dang Sheng Su,Qin Xin
标识
DOI:10.1016/j.jpowsour.2007.05.012
摘要
The durability of polyol-synthesized PtRu/C as anode electrocatalyst for direct methanol fuel cells (DMFCs) has been studied by conducting a 2020-h life-test of a single cell discharging at a constant current density of 100 mA cm−2. Critical fuel cell performance parameters including anode activity, cathode activity and internal resistance are, for the first time, systematically examined at the life-test time of 556, 1093, 1630 and 2020 h. High-resolution transmission electron microscopy and X-ray diffraction (XRD) have also been performed and show that PtRu nanoparticles have agglomerated with the mean particle size increasing from 1.82 to 2.78 nm after the 2020-h life-test. Anode polarization and electrochemical impedance spectroscopy (EIS) show that there exists a stable discharging period where the anode polarization potential is less than 0.363 V versus dynamic hydrogen electrode (DHE). When the anode polarization potential exceeds 0.363 V versus DHE, the performance of the anode degrades dramatically due to the leaching of the unalloyed Ru as indicated by energy dispersive X-ray spectroscopy (EDS) and XRD. This finding provides clues in developing strategies to operate fuel cells achieving maximum lifetime without noticeable performance lose.
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