首页|Investigation on Nd1–xCaxBaCo2O5+δ double perovskite as new oxygen electrode materials for reversible solid oxide cells
Investigation on Nd1–xCaxBaCo2O5+δ double perovskite as new oxygen electrode materials for reversible solid oxide cells
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
? 2022 Elsevier B.V.Novel perovskite-type A-site calcium-doped Nd1–xCaxBaCo2O5+δ oxides were studied in terms of oxygen electrode materials for reversible solid oxide cells (RSOCs). The electrode of x ≤ 0.2 was composed of a tetragonal perovskite structure with a P4/mmm space group. A Ca2+ dopant was used to improve the thermal expansion coefficient (TEC), conductivity, and electrochemical properties of the NdBaCo2O5+δ oxides, with TEC and conductivity values of Nd1–xCaxBaCo2O5+δ (x = 0–0.2) of 17.5–16.2 × 10?6 K?1 and 960.4–1068 S cm?1, respectively. The X-ray photoelectron spectroscopy results indicated that Ca2+ doping has a beneficial influence on the surface oxygen adsorption properties and the increase in the concentration of Co4+. On the basis of the first-principles density functional theory, doping with Ca2+ leads to easier oxygen release and uptake. The area specific resistance of the x = 0.2 electrode was 0.058 Ω cm2 at 700 °C, whereas at 800 °C, the cell using the x = 0.2 oxygen electrode exhibited a maximum power density of 740 mW cm?2 when H2 was used as the fuel, and the current density of the electrolytic pure CO2 at 1.5 V was 1.68 A cm?2. These attractive electrochemical properties suggest that Ca-based doping is an effective method for developing (reversible solid oxide cell) RSOC oxygen electrodes.
International Joint Research Center for Nanophotonics and Biophotonics Nanophotonics and Biophotonics Key Laboratory of Jilin Province Changchun University of Science and Technology
School of Materials Science and Engineering Changchun University of Science and Technology
NSTL
Elsevier
