High Temperature Solid Electrolyte Fuel Cells Using Perovskite‐Type Oxide Based on BaCeO3

Abstract

Using perovskite‐type oxide based on BaCeO3 as a solid electrolyte, small‐size high‐temperature fuel cells were constructed and cell performances were examined. The Nd‐doped BaCeO3 ceramic electrolyte exhibited a mixed conduction of proton and oxide ion. Mixtures of water vapor and some C1 gases such as methanol vapor or methane were used as a fuel by internal reforming to liberate hydrogen in the anode compartment. These fuel cells worked stably above 900°C. At 1000°C, the overvoltage at both electrodes was very small and the performances of the cells were limited mainly by ohmic resistance of the solid electrolyte. Besides platinum, porous nickel was a promising anode material for this electrolyte.

Compatibility and Performance of La0.675Sr0.325Sc0.99Al0.01O3 Perovskite-type Oxide as an Electrolyte Material for SOFCs

“…The terminal voltage was about 0.67 V at 200 mA cm ¹2 at 1273 K, which is high performance for the test cell with a relatively thick electrolyte (0.78 mm). This performance is as good as those using perovskite-type oxide electrolyte fuel cells reported by Iwahara et al 10,11 These fuel cells worked stably above 1073 K in Pt « Pt, Ni-SDC « Pt and Ni-SDC « LSM cells. For the cell using Ni-YSZ and LSM electrodes, the maximum power density was 6 mW cm ¹2 at 1273 K. This result suggested that secondary phase formation at the anode caused this high resistance in the Ni-YSZ « LSM cells.…”

“…Otherwise, perovskite-type oxides such as LaGaO 3 , BaCeO 3 , and SrCeO 3 were applied as electrolyte materials for SOFCs. [8][9][10][11][12][13] Ishihara et al reported that SOFCs using La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 (LSGM) electrolyte exhibited high power density despite the use of a thick electrolyte plate. 9 Its maximum power density attained a value of 1.3 W cm ¹2 at 1273 K. Furthermore, Akikusa et al developed a commercial-sized cell with a 154 mm diameter, and it gave an output power of 31 W/cell at 923 K. 10 LaScO 3 , having a larger free volume than LaGaO 3 , is expected to have high ionic conductivity.…”

Defect chemistry and transport properties of BaxCe0.85M0.15O3-δ

“…[3][4][5][6] The particularly high conductivity of rare-earth (or yttrium) doped BaCeO 3 has led to extensive studies of its applicability as an electrolyte for reduced-temperature solid-oxide fuel cells and for hydrogen sensors. 7,8 Proton incorporation in BaCeO 3 has been generally recognized to occur by two steps: …”

Study of Dehydrated Salts: Electrolyte for Intermediate Temperature Fuel Cell

“…Many sintered oxides like SrCeO 3 , BaCeO 3 , SrZrO 3 doped with Y 2 O 3 , Yb 2 O 3 , etc., which are p-type semiconductors, show proton conducting behavior at high temperature in H 2 /humid ambient [5][6][7]. A series of materials KTaO 3 doped with Ni, Fe or Li 5 AlO 5 show protonic behavior at intermediate temperature range (200-500 ºC) [8][9][10][11][12]. In the present communication, we report the proton conducting behavior of some specific salt hydrates (i.e.…”