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SOFC Stacks Operating under Direct Internal Steam Reforming of Methane
Author(s) -
Fu Q.,
Freundt P.,
Bomhard J.,
Hauler F.
Publication year - 2017
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201600078
Subject(s) - steam reforming , methane , anode , stack (abstract data type) , methane reformer , materials science , degradation (telecommunications) , chemical engineering , catalysis , waste management , chemistry , electrode , hydrogen production , organic chemistry , electrical engineering , computer science , programming language , engineering
Abstract Three SOFC test stacks were operated under conditions of direct internal steam reforming of methane at 750 °C. The influence of anode gas compositions (H 2 /N 2 , CH 4 /H 2 O, CH 4 /H 2 /H 2 O) on the stack degradation rate has been investigated through long‐term durability testing. It has been found that complete internal steam reforming of methane leads to much faster degradation in comparison to partial pre‐reforming. Possible reason for that is the depletion of Ni‐catalyst due to the formation of volatile Ni(OH) 2 at the fuel entrance. Though this effect was observed previously at 950 °C, the present results indicate that it might still play an important role at 750 °C. The lowest degradation was observed with Stack‐3 (ca. 12 mV kh −1 per RU or 1.5% kh −1 ), which shows also a reasonably high electrical efficiency (>50%) under fuel utilisation of 70.2%.