Rare earth Nickelate electrodes containing heavily doped ceria for reversible solid oxide fuel cells

[摘要] The electrochemical performance of composite rare-earth nickelate-rare-earth doped ceria oxygen electrodes, with a high level of rare-earth doping in ceria are reported. Additionally, the chemical stability of these compositions is reported at both the sintering (1240 degrees C) and operating temperature (800 degrees C). Specifically, a lanthanum nickelate La2NiO4+delta (LNO) -50 mol% lanthanum doped ceria (LDC50) oxygen electrode and a neodymium nickelate Nd2NiO4+delta (NNO) -50 mol% neodymium doped ceria (NDC50) oxygen electrode are tested in solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) modes and compared to a composite (La0.75Sr0.25)0.95MnO3 +/-delta (LSM)-8 mol% yttria stabilized zirconia (YSZ) electrode. The LNO-LDC50 oxygen electrode reaches a current density which is approximately three times that of the LSM-YSZ electrode in SOFC mode at 0.7 V and approximately two times the LSM-YSZ electrode at 1.2 V in SOEC mode. Similarly the NNONDC50 oxygen electrode reaches a current density which is approximately two times and approximately one and a half times that of LSM-YSZ at 0.7 V and 1.2 V respectively. Oxygen surface exchange results for LNO and NNO are also reported which show different oxygen exchange kinetics during oxidation versus reduction steps.

[发布日期] 2021-09-30

[关键词] Reversible solid oxide cell;Solid oxide fuel cell;Solid oxide electrolysis cell;Lanthanum nickelate;Composite electrode;Oxygen electrode