AUTHOR=Zhen Shuying , Zhang Lihong , Xu Chunming , Zhang Ding , Yi Qun , Sun Wang , Sun Kening 

TITLE=Ti/Ni co-doped perovskite cathode with excellent catalytic activity and CO2 chemisorption ability via nanocatalysts exsolution for solid oxide electrolysis cell

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.1027713

DOI=10.3389/fchem.2022.1027713

ISSN=2296-2646

ABSTRACT=<p>Carbon dioxide (CO<sub>2</sub>) gas is the main cause of global warming and has a significant effect on both climate change and human health. In this study, Ni/Ti co-doped Sr<sub>1.95</sub>Fe<sub>1.2</sub>Ni<sub>0.1</sub>Ti<sub>0.2</sub>Mo<sub>0.5</sub>O<sub>6-δ</sub> (SFNTM) double perovskite oxides were prepared and used as solid oxide electrolysis cell (SOEC) cathode materials for effective CO<sub>2</sub> reduction. Ti-doping enhances the structural stability of the cathode material and increases the oxygen vacancy concentration. After treatment in 10% H<sub>2</sub>/Ar at 800°C, Ni nanoparticles were exsolved <italic>in situ</italic> on the SFNTM surface (Ni@SFNTM), thereby improving its chemisorption and activation capacity for CO<sub>2</sub>. Modified by the Ti-doping and the <italic>in situ</italic> exsolved Ni nanoparticles, the single cell with Ni@SFNMT cathode exhibits improved catalytic activity for CO<sub>2</sub> reduction, exhibiting a current density of 2.54 A cm<sup>−2</sup> at 1.8 V and 800°C. Furthermore, the single cell shows excellent stability after 100 h at 1.4 V, indicating that Ni/Ti co-doping is an effective strategy for designing novel cathode material with high electrochemical performance for SOEC.</p>