Abstract
Solid Oxide Electrolysis Cells (SOECs) can electro-reduce carbon dioxide to carbon monoxide, which not only effectively utilizes greenhouse gases, but also converts excess electrical energy into chemical energy. Perovskite-based oxides with exsolved metal nanoparticles are promising cathode materials for direct electrocatalytic reduction of CO(2) through SOECs, and have thus received increasing attention. In this work, we doped Pr(0.7)Ba(0.3)MnO(3-δ) at the B site, and after reduction treatment, metal nanoparticles exsolved and precipitated on the surface of the cathode material, thereby establishing a stable metal-oxide interface structure and significantly improving the electrocatalytic activity of the SOEC cathode materials. Through research, among the Pr(0.7)Ba(0.3)Mn(1-x)Ni(x)O(3-δ) (PBMN(x) = 0-1) cathode materials, it has been found that the Pr(0.7)Ba(0.3)Mn(0.9)Ni(0.1)O(3-δ) (PBMN(0.1)) electrode material exhibits greater catalytic activity, with a CO yield of 5.36 mL min(-1) cm(-2) and a Faraday current efficiency of ~99%. After 100 h of long-term testing, the current can still remain stable and there is no significant change in performance. Therefore, the design of this interface has increasing potential for development.