Rational design of the self-assembled BaCo1-xZrxO3-δ (x = 0.8–0.2) nanocomposites as the promising low/intermediate-temperature solid oxide fuel cell cathodes. Issue 3 (March 2022)

• Record Type: Journal Article
• Authors: Qi, Huiying; Zhang, Tonghuan; Cheng, Mojie; Liu, Di; Tu, Baofeng
• Is Part Of: Journal of the European Ceramic Society. Volume 42:Issue 3(2022)
• Page Start: 1042
• Page End: 1052
• Publication Date: 2022-03
• Subjects: Solid oxide fuel cells -- Perovskites -- Nanocomposites -- Heterointerface -- Oxygen reduction reaction; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.11.005
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Assembling multiple perovskites with complementary properties is a promising strategy to achieve high-performance cathodes for low/intermediate-temperature solid oxide fuel cell (LT/IT-SOFC). In this work, self-assembling perovskites of cubic BaZr0.82 Co0.18 O3-δ (cub-BZC) and hexagonal BaCo0.96 Zr0.04 O2.6+δ (12H-BC) at the nanoscale can be realized in novel designed nanocomposites with nominal composition of BaCo1-x Zrx O3-δ (x = 0.8–0.2), which can possess congenital compatibility, improved thermal expansion coefficients and electrical conductivity. The relative contents of cubic and hexagonal phases are significantly correlated with the zirconium content (x). Therein, BaCo1-x Zrx O3-δ nanocomposites exhibit relatively low content differences among perovskite phases when x = 0.4 (cubic/hexagonal = 62:38) and x = 0.2 (hexagonal/cubic = 69:31) nanocomposites, which can form more extensive heterointerfaces for promoting oxygen adsorption, dissociation and reduction reaction. When further applied as cathode, the cell with BaCo1-x Zrx O3-δ nanocomposites achieve 2265–598 mW cm −2 (800–600 °C) when x = 0.2 as a promising IT-SOFC cathode, and 315−148 mW cm −2 (550–500 °C) when x = 0.4 as a promising LT-SOFC cathode.