Poisoning effects of sulfur dioxide in an air stream on spatial proton exchange membrane fuel cell performance

JOURNAL OF POWER SOURCES

卷:438

Article

Reshetenko, Tatyana¹  Laue, Vincent²  Krewer, Ulrike²  Artyushkova, Katerina³ 

[1] Univ Hawaii, Hawaii Nat Energy Inst, Honolulu, HI 96822 USA

[2] Tech Univ Carolo Wilhelmina Braunschweig, Inst Energy & Proc Syst Engn, Franz Liszt Str 35, D-38106 Braunschweig, Germany

[3] Univ New Mexico, Ctr Microengn Mat, Albuquerque, NM 87106 USA

关键词: PEMFC;    Pt cathode;    Airborne contaminant;    SO2 poisoning;    Segmented cell;    Modeling;   

DOI  :  10.1016/j.jpowsour.2019.226949

来源: Elsevier

【 摘 要 】

The paper examines spatial and temporal proton exchange membrane fuel cell (PEMFC) performance under exposure to SO2 in an air stream at low and high operating currents. Cathode poisoning by 2 ppm SO2 resulted in cell voltage losses of 60 and 295 mV for overall cell currents of 0.2 and 1.0 A cm(-2), respectively. The voltage drop was accompanied by localized current redistributions, which depend on the operating current hold. The observed spatial PEMFC behavior is attributed to different electrochemical reactions of adsorbed SO2 occurring at high and low cathode potentials. SO2 is mainly oxidized at potentials corresponding to 0.2 A cm(-2), while reduction to zero-valent sulfur takes place at 1.0 A cm(-2), as confirmed by XPS. Full self-recovery was not observed for either operating current hold, and only potential cycling recovered the performances. Moreover, comparison of the initial and after-poisoning electrochemical PEMFC parameters revealed that SO2 exposure led to a decrease in Pt electrochemical surface area due to growth of the Pt particle size and caused final performance losses of 20-30 and 25-50 mV for low and high current operations. A physics-based mathematical model was successfully developed and applied for analysis of SO2 effects on PEMFC performance.

【 授权许可】

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