Chromium deposition and poisoning of La ₂ NiO ₄ cathode of solid oxide fuel cell

Abstract

Chromium deposition and poisoning of La2NiO4 cathode of solid oxide fuel cell were studied. La2NiO4 cathode showed stable performance in the presence of metallic interconnects. Comparing with the polarization resistance (Rp) of La2NiO4 cathode in the absence of metallic interconnects, Rp did not change in the presence of metallic interconnect. After electrical conductivity relaxation method, La2NiO4 with high surface oxygen diffusion coefficients working under Cr atmosphere improved the oxygen reduction kinetics and increased cathode O2 reduction reaction rates. No chromium deposition was observed on the La2NiO4 cathode surface after polarization for 20 h at 800°C. The chemical compatibility of La2NiO4/Cr2O3 and La2NiO4/Gd0.1Ce0.9O1.95 (GDC) study indicates that La2NiO4 did not react with Cr2O3 and GDC under the operating temperature. The results indicate that La2NiO4 cathode is a potential chromium-tolerant material of solid oxide fuel cell.

Improved Tolerance of Lanthanum Nickelate (La2NiO4+δ) Cathodes to Chromium Poisoning Under Current Load in Solid Oxide Fuel Cells

“…24,25 Because rare-earth nickelates are free of Sr and Mn, they are also considered to possess better Crpoisoning tolerance than conventional LSM or LSCF cathodes. [26][27][28][29][30] Lee et al 26 studied the Crpoisoning effect of La 2 NiO 4+d by infiltrating Cr into the symmetric cell electrode, and they reported that performance of LNO is less sensitive to Cr than LSCF although the reaction product LaCrO 3 was observed. Hou et al 29 and Lee et al 30 investigated chromium poisoning of La 2 NiO 4 and Nd 2 NiO 4+d using symmetric cells, respectively, and they showed insignificant poisoning effects on the electrode performance and microstructure.…”

“…Halfcells were cathodically polarized or held under open-circuit condition, and the ohmic and polarization resistances of the electrode were periodically characterized using galvanostatic current interruption. Different from previous studies reported by other researchers, [26][27][28][29][30] in this work, anode-supported cells (ASC) with an La 2 NiO 4+d electrode were also tested with or without current load, during which voltage-current (V-I) measurements were conducted periodically. The V-I curves were analyzed using a polarization model, and the effects of chromium poisoning on different polarization resistances of LNO electrode were studied for the first time and compared with baseline LSM electrodes.…”

Segregation and interdiffusion processes in perovskites: a review of recent advances

“…33,[36][37][38][39][40] SOFC operation at high and medium-high temperatures is associated with processes leading to metal corrosion and oxidation; diffusion of ions from the electrode material into the electrolyte, leading to deterioration of conductivity and stability; segregation of cations on the surface of structural elements, forming new phases; degradation of the electrochemical cell; or poisoning of SOFC anodes (Cl 2 , H 2 S, CH 3 SH, COS) [41][42][43] and cathodes (SO 2 , PO 3 , CrO 3 ). [44][45][46][47] Existing problems affect the lifetime of SOFCs, which hinders their commercialization.…”

A review of Solid Oxide Fuel Cell cathode materials with respect to their resistance to the effects of chromium poisoning

“…Hou et al [236] concluded that LNO-214 could offer a promising chromium-resistant cathode for SOFC finding little evidence of chromium poisoning over a short-term test (~20h). Generally, the performance of LNO-214 in a dry, chromium-containing atmosphere has been shown to be relatively stable but, like many of the other materials discussed thus far, the degradation becomes significantly more prevalent in humid conditions [185,237,238].…”