JOURNAL OF POWER SOURCES | 卷:342 |
Spatial proton exchange membrane fuel cell performance under bromomethane poisoning | |
Article | |
Reshetenko, Tatyana V.1  Artyushkova, Kateryna2  St-Pierre, Jean1  | |
[1] Univ Hawaii, Hawaii Nat Energy Inst, Honolulu, HI 96822 USA | |
[2] Univ New Mexico, Ctr Microengn Mat, Albuquerque, NM 87131 USA | |
关键词: PEMFC; Pt cathode; Bromomethane; Airborne contaminant; Segmented cell; | |
DOI : 10.1016/j.jpowsour.2016.12.046 | |
来源: Elsevier | |
【 摘 要 】
The poisoning effects of 5 ppm CH3Br in the air on the spatial performance of a proton exchange membrane fuel cell (PEMFC) were studied using a segmented cell system. The presence of CH3Br caused performance loss from 0.650 to 0.335 Vat 1 A cm(-2) accompanied by local current density redistribution. The observed behavior was explained by possible bromomethane hydrolysis with the formation of Br-. Bromide and bromomethane negatively affected the oxygen reduction efficiency over a wide range of potentials because of their adsorption on Pt, which was confirmed by XPS. Moreover, the PEMFC exposure to CH3Br led to a decrease in the anode and cathode electrochemical surface area (similar to 52-57%) due to the growth of Pt particles through agglomeration and Ostwald ripening. The PEMFC did not restore its performance after stopping bromomethane introduction to the air stream. However, the H-2/N-2 purge of the anode/cathode and CV scans almost completely recovered the cell performance. The observed final loss of similar to 50 mV was due to an increased activation overpotential. PEMFC exposure to CH3Br should be limited to concentrations much less than 5 ppm due to serious performance loss and lack of self-recovery. (C) 2016 Elsevier B.V. All rights reserved.
【 授权许可】
Free
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
10_1016_j_jpowsour_2016_12_046.pdf | 2445KB | download |