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Tape Casting of High-Performance Low-Temperature Solid Oxide Cells with Thin La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ Electrolytes and Impregnated Nano Anodes.
ACS Applied Materials & Interfaces 2017 March 2
Low-temperature solid oxide cells (LT-SOCs), operating at 400 to 650 °C, have great potential for commercialization since they can provide lower cost and improved long-term durability. Low operating temperature can also enable high round-trip efficiency of SOCs as reversible energy storage devices. This paper describes Sr0.8 La0.2 TiO3-α (SLT) anode supported LT-SOC with thin La0.8 Sr0.2 Ga0.8 Mg0.2 O3-δ (LSGM) electrolyte made by tape casting, with screen printed La0.6 Sr0.4 Fe0.8 Co0.2 O3-δ (LSCF) cathode and impregnated Ni anode. Optimization of the anode functional layers is described; the best anodes had 68 vol % LSGM and 12.3 vol % Ni and yielded maximum power density of 1.6 Wcm-2 with a cell area specific resistance (ASR) of 0.21 Ωcm2 at 650 °C. Most of the cell ASR was associated with the cathode. Reversible electrolysis and fuel cell operation yielded similar characteristics with both 50% H2 -50% H2 O and syngas fuel. Life testing over 500 h showed that the cathode impedance stabilized after an initial break-in period; the ohmic and anode resistances, though relatively small, increased slightly with time.
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