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Synergistic effects of sulfur poisoning and gas diffusion on polarization loss in anodes of solid oxide fuel cells
Author(s) -
Niu Yinghua,
Lv Weiqiang,
Wei Zhaohuan,
Huo Weirong,
He Weidong
Publication year - 2018
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15997
Subject(s) - tortuosity , sulfur , anode , polarization (electrochemistry) , oxide , chemistry , diffusion , adsorption , gaseous diffusion , chemical engineering , inorganic chemistry , porosity , desorption , analytical chemistry (journal) , electrode , thermodynamics , environmental chemistry , organic chemistry , physics , engineering
Poisoning effects of sulfur compounds on the performances of solid oxide fuel cells are non‐trivial. However, the synergistic effects of gas diffusion, adsorption, desorption and reaction in anodes are typically neglected. In this work, an analytical model is derived to quantitatively evaluate the poisoning effects of H 2 S. The results show that sulfur poisoning correlates closely with inefficient gas diffusion for small anode pore size, small porosity/tortuosity, and low working temperatures. As compared with concentration polarization, H 2 S‐diffusion‐induced activation polarization in thin anodes with a largeɛ τis detrimental, especially for low‐temperature operations with a high H 2 S concentration and a low current density. © 2017 American Institute of Chemical Engineers AIChE J , 64: 1127–1134, 2018