In this study, the effects of Cu-ion substitution on the densification, microstructure, and physical properties of LaCo_0.4Ni_0.6-xCu_xO_3-δ ceramics were investigated. The results indicate that doping with Cu ions not only enhances the densification but also promotes the grain growth of LaCo_0.4Ni_0.6-xCu_xO_3-δ ceramics. The Cu substitution at x ≤ 0.2 can suppress the formation of La₄Ni₃O₁₀, while the excess Cu triggers the formation of La₂CuO_4.032 phase. The p-type conduction of LaCo_0.4Ni_0.6O_3-δ ceramic was significantly raised by Cu substitution because the acceptor doping ($\begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill C{u}_{Ni}^{\text{'}}\hfill \end{array}\hfill \end{array}\hfill \end{array}\hfill \end{array}$) triggered the formation of hole carriers; this effect was maximized in the case of LaCo_0.4Ni_0.4Cu_0.2O_3-δ composition (1480 S cm⁻¹ at 500 °C). Thermogravimetric data revealed a slight weight increase of 0.29% for LaCo_0.4Ni_0.4Cu_0.2O_3-δ compact up to 871 °C; this is due to the incorporation of oxygen that creates metal vacancies and additional $\begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill h^{•}\hfill \end{array}\hfill \end{array}\hfill \end{array}\hfill \end{array}\hfill \end{array}$carriers, partially compensating the conductivity loss due to the spin-disorder scattering. As the temperature of the LaCo_0.4Ni_0.4Cu_0.2O_3-δ compacts rose above 871 °C, significant weight loss with temperature was observed because of the release of lattice oxygen to the ambient air as a result of Co (IV) thermal reduction accompanied by the formation of oxygen vacancies. A solid oxide fuel cell (SOFC) single cell with Sm_0.2Ce_0.8O_2-δ (electrolyte) and LaCo_0.4Ni_0.4Cu_0.2O_3-δ (cathode) was built and characterized. The Ohmic (0.256 Ω cm²) and polarization (0.434 Ω cm²) resistances of the single cell at 700 °C were determined; and the maximum power density was 0.535 W cm⁻². These results show that LaCo_0.4Ni_0.4Cu_0.2O_3-δ is a very promising cathode material for SOFC applications.

在这项研究中，研究了铜离子替代对LaCo _0.4 Ni _0.6-x Cu _x O3 _-δ陶瓷的致密化，微观结构和物理性能的影响。结果表明，掺杂铜离子不仅增强了LaCo _0.4 Ni _0.6-x Cu _x O3 _-δ陶瓷的致密化，而且促进了其晶粒长大。在Cu的置换X  ≤0.2，能够抑制的La的形成₄的Ni ₃ ø ₁₀，而过量的Cu会触发的La的形成₂的CuO _4.032相。LaCo的p型传导Cu取代显着提高了_0.4 Ni _0.6 O3 _-δ陶瓷的含量，因为受主掺杂（$\begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill C{ü}_{ñ\mathrm{一世}}^{\text{'}}\hfill \end{array}\hfill \end{array}\hfill \end{array}\hfill \end{array}$）触发了空穴载体的形成；在LaCo _0.4 Ni _0.4 Cu _0.2 O3 _-δ组成（在500°C下为1480 S cm ^-1）的情况下，这种效果最大。热重数据显示，在871°C以下的温度下，LaCo _0.4 Ni _0.4 Cu _0.2 O3 _-δ压块的重量略微增加了0.29％。这是由于掺入氧气会产生金属空位和其他$\begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill \begin{array}{c}\hfill H^{•}\hfill \end{array}\hfill \end{array}\hfill \end{array}\hfill \end{array}\hfill \end{array}$载流子，部分补偿了由于自旋无序散射而导致的电导率损失。当LaCo _0.4 Ni _0.4 Cu _0.2 O3 _-δ压块的温度升至871°C以上时，观察到重量显着下降，这是由于Co（IV）热还原导致晶格氧释放到周围空气中伴随着氧空位的形成。构建并表征了具有Sm _0.2 Ce _0.8 O2 _-δ（电解质）和LaCo _0.4 Ni _0.4 Cu _0.2 O3 _-δ（阴极）的固体氧化物燃料电池（SOFC）单电池。欧姆（0.256Ωcm ²）和700℃下单电池的极化电阻（0.434Ωcm ²）。最大功率密度为0.535Wcm ^-2。这些结果表明，LaCo _0.4 Ni _0.4 Cu _0.2 O3 _-δ是用于SOFC应用的非常有前景的阴极材料。