(La_(0.75)Sr_(0.25))_(0.95)(Cr_(0.5)Mn_(0.5))O_(3-δ)-Ce_(0.8)Gd_(0.2)O_(1.9) scaffolded composite cathode for high temperature CO_2 electroreduction in solid oxide electrolysis cell

摘要

As a promising cathode material for CO2electroreduction in solid oxide electrolysis cell, (La,Sr) (Cr,Mn)O3perovskite usually suffers from insufficient electrocatalytic activity and poor stability. We report here that a (La,Sr) (Cr,Mn)O3-based scaffolded composite cathode fabricated through co-loading (La0.75Sr0.25)0.95(Cr0.5Mn0.5)O3-δ-Ce0.8Gd0.2O1.9composite within the porous yttria-stabilized zirconia scaffold, enables the electrolyte-supported solid oxide electrolysis cell to exhibit high electrocatalytic activity and stability towards CO2electroreduction in comparison with the conventional (La0.75Sr0.25)0.95(Cr0.5Mn0.5)O3-δ-Ce0.8Gd0.2O1.9cathode. This scaffolded architecture design provides micro-sized pores for CO2transportation, well-connected yttria-stabilized zirconia network for oxygen ion conduction, (La0.75Sr0.25)0.95(Cr0.5Mn0.5)O3-δ-Ce0.8Gd0.2O1.9composite catalyst layer for creating highly active (La0.75Sr0.25)0.95(Cr0.5Mn0.5)O3-δ-Ce0.8Gd0.2O1.9-gas three-phase boundaries and increasing surface oxygen vacancies concentration. Furthermore, the intimate interaction between (La0.75Sr0.25)0.95(Cr0.5Mn0.5)O3-δand Ce0.8Gd0.2O1.9nanoparticles in the composites effectively suppresses particles aggregation. The (La0.75Sr0.25)0.95(Cr0.5Mn0.5)O3-δperovskite-Ce0.8Gd0.2O1.9fluorite scaffolded composite cathode offers a promising approach to prepare highly active and stable (La,Sr) (Cr,Mn)O3based cathode for CO2electroreduction in high temperature solid oxide electrolysis cell.