Solid oxide electrolysis cell (SOEC) is a device that can efficiently convert excessive power of renewable energy, such as wind or solar energy into chemical energy. High temperature CO 2 electrolysis based on solid oxide electrolysis cell has been proved as an effective method to produce sustainable fuels and reduce greenhouse emissions. The performance of cathodes as the place where the electrolysis reaction takes place for fuel gas affects the efficiency of SOEC, whereas traditional cathodes show relatively low catalytic activity towards CO 2 electrolysis. In recent years, in addition to the optimization of traditional Ni-based cathodes, the research on perovskite cathodes with better redox stability has been carried out rapidly. In this paper, the development of different cathodes of solid oxide electrolysis cell used for CO 2 electrolysis is summarized, from the study of new materials with different doping ratios for CO 2 electrolysis, to the microstructure optimization of electrode. It was found, that both durability and catalytic activity for the cathode materials could significantly improve the performance of single cells of SOEC. Finally, more prospects for future research work are put forward.

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High temperature solid oxide electrolysis cells (SOECs) have the potential to efficiently and economically produce of hydrogen fuels. In this paper, large area fuel electrode-supported half cells with Zr0.92Y0.08O2-δ (YSZ) electrolyte and Ni/YSZ fuel electrode were fabricated by aqueous-based co-tape casting in conjunction with co-sintering, and the air electrode with La0.6Sr0.4Co0.2Fe0.8O3+δ/Ce0.9Gd0.1O2+δ (LSCF/CGO) was fabricated by screen printing. In solid oxide fuel cell (SOFC) mode, the maximum power density is 447 mW cm-2 at 800 °C with humidified H2 as the fuel and air as the oxidant. In solid oxide electrolysis cell (SOEC) mode, the hydrogen production rate of button cell is 222.2 ml h-1 cm-2 under an electrolysis voltage of 1.3 V with 70 vol.% steam.