Thermodynamic and electrical characteristics of NdBaCo2O5+delta at various oxidation and reduction states
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- Thermodynamic and electrical characteristics of NdBaCo2O5+delta at various oxidation and reduction states
- Yoo, Seonyoung; Shin, Jee Young; Kim, Guntae
- Cathode materials; Chemical energy; Coulometric titration; Eco-friendly; Electrical characteristic; Electrical conductivity; Electrical energy; Higher temperatures; Intermediate temperature solid oxide fuel cell; IT-SOFCs; New cathode material; Operating temperature; Ordered perovskite; Oxidation and reduction; Probe methods; Redox property; Reduction state
- Issue Date
- ROYAL SOC CHEMISTRY
- JOURNAL OF MATERIALS CHEMISTRY, v.21, no.2, pp.439 - 443
- A solid oxide fuel cell is a device that converts the chemical energy in fuel to the electrical energy directly, efficiently and eco-friendly. The cation ordered perovskite-related oxide, NdBaCo2O5+delta (NBCO), is known as one of the best cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs) because of their superior electrochemical properties. The aim of this work is to identify the crucial characteristics of NdBaCo2O5+delta/YSZ composites, such as the redox properties, the structures, and the electrical conductivities for a new cathode material for IT-SOFCs. Thermodynamic redox properties including oxidation enthalpies and entropies were investigated by coulometric titration. The isotherms were obtained at 923, 973 and 1023 K over a wide range of p(O-2). Oxygen non-stoichiometries have shown that higher temperatures lead the composites to a deeper reduction state rapidly near the p(O-2) of 10(-5) atm and at 1023 K, which can be the sign of the decomposition. Therefore, the NBCO-YSZ composites may not be suitable for the cathodes of SOFCs above operating temperatures of 1023 K due to the decomposition. The oxidation enthalpies and entropies were determined from the isotherms and the electrical conductivities measured by the 4-probe method were high enough for IT-SOFC cathode applications.
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