Abstract
In this study, a samarium cerium electrolyte-supported solid oxide fuel cell (SOFC) was assembled with Ce0.8Sm0.2O2-δ (SDC) electrolyte, La0.58Sr0.4Fe0.8Co0.2O3-δ (LSCF) as cathode and WNi-Ce as anode. A porous layer of SDC between anode and electrolyte was used to improve adhesion of the anode ink. The cell performance was investigated with hydrogen and three simulated biogas mixtures (CH4 /CO2 /H2 70/25/5, 60/35/5 and 50/45/5) on the anode and static air on the cathode at 750℃. In addition, the effect of H2S (10ppm) incorporation in the biogas on the cell performance has been examined. The electrochemical behavior of the cell has been evaluated using IV curves, impedance spectroscopy and load demands. The results revealed that the best performance was obtained with the biogas composition richer in CH4 due to probably the higher catalytic activity of WNi-Ce in this operation condition. Furthermore, the addition of H2S in biogas causes an important decrease on the cell performance owing to the sulphuration reactions of anodic material. However, the stability tests under load demands revealed that the cell does not suffer degradation under any studied operation conditions (biogas composition and H2S in the fuel). This suggests that WNi-Ce could be a suitable anode material for ceria-electrolyte SOFC direct feeding of biogas.
Highlights
Solid oxide fuel cell (SOFC) technology attracts much interest thanks to the flexibility that it offers to be fed, besides pure hydrogen, with other fuels
An interesting alternative to favor the direct utilization of biogas as fuel in solid oxide fuel cell (SOFC) could be a bimetallic formulation of nickel and tungsten combined with CeO2 (WNi-Ce) as anode material
Electronically and catalytically active characteristics of doped ceria under high-temperature reducing atmosphere improve the anode reaction kinetics when inserted between the anode and the electrolyte, and as results the electrochemical performance of SOFCs further improves
Summary
Solid oxide fuel cell (SOFC) technology attracts much interest thanks to the flexibility that it offers to be fed, besides pure hydrogen, with other fuels. Doping nickel catalysts with small amounts of the other materials is a popular and effective approach taken to alleviate carbon deposition and sulphur poisoning [9,10] In this context, CeO2 is widely used in sulphur removal processes and adds coking resistance in catalytic processes [11]. Electronically and catalytically active characteristics of doped ceria under high-temperature reducing atmosphere improve the anode reaction kinetics when inserted between the anode and the electrolyte, and as results the electrochemical performance of SOFCs further improves. The chemical compatibility between WNi-Ce and SDC was analyzed by XRD
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