Ni-samaria-doped Ceria (Ni-SDC) Anode-supported Solid Oxide Fuel Cell (SOFC) Operating with CO

• Main Authors: Asmida, Ideris, Croiset, Eric, Pritzker, Mark
• Format: Article
• Language: English
• Published: Elsevier 2017
• Subjects: TP Chemical technology
• Online Access: http://umpir.ump.edu.my/id/eprint/13694/1/fkksa-2017-asmida-Ni-samaria-doped%20ceria%20%28Ni-SDC1.pdf; http://umpir.ump.edu.my/id/eprint/13694/; http://dx.doi.org/10.1016/j.ijhydene.2016.05.203

The performance of nickel-samaria-doped ceria (Ni-SDC) anode-supported cell with CO-CO2 feed was evaluated. The aim of this work is to examine carbon formation on the Ni-SDC anode when feeding with CO under conditions when carbon deposition is thermodynamically favoured. Electrochemical tests were conducted at intermediate temperatures (550–700 °C) using 20 and 40% CO concentrations. Cell operating with 40% CO at 600–700 °C provided maximum power densities of 239–270 mW cm−2, 1.5 times smaller than that achieved with humidified H2. Much lower maximum power densities were attained with 20% CO (50–88 mW cm−2). Some degradation was observed during the 6 h galvanostatic operation at 0.1 A cm−2 with 40% CO fuel at 550 °C which is believed due to the accumulation of carbon at the anode. The degradation in cell potential occurred at a rate of 4.5 mV h−1, but it did not lead to cell collapse. EDX mapping at the cross-section of the anode revealed that carbon formed in the Ni-SDC cell was primarily deposited in the anode section close to the fuel entry point. Carbon was not detected at the electrolyte-anode interface and the middle of the anode, allowing the cell to continue operation with CO fuel without a catastrophic failure