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In this work, we investigate a novel A-site ordered layered perovskite oxide, (PrBa) 0.95 Fe 1.8−x Cu x Nb 0.2 O 5+δ (PBFCN), as an anode material for hybrid direct carbon fuel cells (HDCFCs). We study the effect of anode composition on the electrochemical performance of HDCFCs. The electrolyte-supported single cell with (PrBa) 0.95 Fe 1.4 Cu 0.4 Nb 0.2 O 5+δ (PBFCu 0.4 N) anode achieves the highest peak power density of 431 mW cm −2 at 800 °C with activated carbon as the fuel. Moreover, a power generation unit is also made to demonstrate the practical utilization of PBFCN, which delivers a peak power of 0.51 W at 800 °C without any carrier gas, and a small fan can operate for more than 10 h by using the as-fabricated HDCFC as a power generation unit. The PBFCN anode achieves greatly enhanced catalytic activity by improving the chemical adsorption and electrochemical oxidation of CO at the anode/ CO interface, which is mainly due to the high-activity Cu ions in PBFCN. The inactive element Nb doping and ordered layered structure endow the material with excellent redox structural stability. The present study provides a new idea for the design and development of high-performance anode materials for HDCFCs applications.

The design of active cathode catalysts, with abundant active sites and outstanding catalytic activity for CO 2 electroreduction, is important to promote the development of solid oxide electrolysis cells (SOECs). Herein, A-site-deficient perovskite oxide (La 0.2 Sr 0.8 ) 0.9 Ti 0.5 Mn 0.4 Cu 0.1 O 3−δ (LSTMC) is synthesized and studied as a promising cathode for SOECs. Cu nanoparticles can be rapidly and uniformly in situ-exsolved under reducing conditions. The heterostructure formed by the exsoluted Cu and LSTMC provides abundant active sites for the catalytic conversion of CO 2 to CO. Combined with the remarkable oxygen-ion transport capacity of the LSTMC substrate, the specially designed Cu@LSTMC cathode exhibits a dramatically improved electrochemical performance. Furthermore, first-principles calculations proposed a mechanism for the adsorption and activation of CO 2 by the heterostructure. Electrochemically, the Cu@LSTMC presents a high current density of 2.82 A cm −2 at 1.8 V and 800 °C, which is about 2.5 times higher than that of LSTM (1.09A cm −2 ).