Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7722832 | International Journal of Hydrogen Energy | 2013 | 8 Pages |
Abstract
In this paper, direct methanol fuel cell's (DMFC's) electrochemical process was successfully investigated in situ using Electrochemical Impedance Spectroscopy (EIS) method. Under three-electrode system, anode and cathode's polarization overpotential, charge transferring resistance and active surface were independently measured in order to reveal the degradation factors after 50Â h stability testing. The results showed that Ru's dispersing, membrane's swelling and water flooding were main reasons resulting in performance decline. And SEM images confirmed these conclusions. Moreover, cathode's degradation was less serious than anode and it could be recovered. Traditional equivalent circuit model of self-breathing DMFC was modified according to a fact that the dielectric relaxation phenomenon of porous electrode occurred at cathode rather than anode.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yituo Wang, Guicheng Liu, Meng Wang, Gaoyang Liu, Jianling Li, Xindong Wang,