Abstract
Strontium and cobalt-free LaNi(0.6)Fe(0.4)O(3-δ) is considered one of the most promising electrodes for solid-state electrochemical devices. LaNi(0.6)Fe(0.4)O(3-δ) has high electrical conductivity, a suitable thermal expansion coefficient, satisfactory tolerance to chromium poisoning, and chemical compatibility with zirconia-based electrolytes. The disadvantage of LaNi(0.6)Fe(0.4)O(3-δ) is its low oxygen-ion conductivity. In order to increase the oxygen-ion conductivity, a complex oxide based on a doped ceria is added to the LaNi(0.6)Fe(0.4)O(3-δ). However, this leads to a decrease in the conductivity of the electrode. In this case, a two-layer electrode with a functional composite layer and a collector layer with the addition of sintering additives should be used. In this study, the effect of sintering additives (Bi(0.75)Y(0.25)O(2-δ) and CuO) in the collector layer on the performance of LaNi(0.6)Fe(0.4)O(3-δ)-based highly active electrodes in contact with the most common solid-state membranes (Zr(0.84)Sc(0.16)O(2-δ), Ce(0.8)Sm(0.2)O(2-δ), La(0.85)Sr(0.15)Ga(0.85)Mg(0.15)O(3-δ), La(10)(SiO(4))(6)O(3-δ), and BaCe(0.89)Gd(0.1)Cu(0.01)O(3-δ)) was investigated. It was shown that LaNi(0.6)Fe(0.4)O(3-δ) has good chemical compatibility with the abovementioned membranes. The best electrochemical activity (polarization resistance about 0.02 Ohm cm(2) at 800 °C) was obtained for the electrode with 5 wt.% Bi(0.75)Y(0.25)O(1.5) and 2 wt.% CuO in the collector layer.