原位构建NiFe合金纳米颗粒均匀包覆Pr0.8Sr1.2(NiFe)O4-δ阴极材料用于固体氧化物电解池直接电解CO2

In situ fabrication NiFe alloy nanoparticles modified Pr0.8Sr1.2(NiFe)O4-δ cathode material for direct CO2 electrolysis in solid oxide electrolysis cell

摘要:

通过固体氧化物电解池（SOEC）将CO2转化为有价值的化学物质，引起了人们的特别关注．但是，开发对CO2的具有高化学吸附性和催化活性的阴极材料仍然是一大挑战．通过原位析出法构建的NiFe纳米颗粒修饰的Pr0.8Sr1.2(NiFe)O4-δ（PSNF-NFA）固体氧化物电解池（SOEC）阴极材料用于直接CO2电解．XRD和SEM分析证明，该NiFe合金析出时会导致基体发生相变，而且析出的纳米颗粒尺寸小且分布均匀．纳米颗粒和钙钛矿氧化物基体的界面具有丰富的氧空位，增强了CO2的化学吸附和解离，显著提高了CO2电解性能．该新型的复合阴极在800 ℃的温度和1.6 V的电压下，显示出高达2.5 A/cm2的电流密度．此外，该PSNF-NFA阴极对直接CO2电解也显示出良好的稳定性和抗积碳性．

Abstract:

In recent years, the conversion of CO2 into valuable chemical substances through solid oxide electrolysis cells (SOEC) has attracted special attention. However, it is still a big challenge to develop cathode materials with high chemisorption and catalytic activity for CO2. In this work, the NiFe nanoparticles modified Pr0.8Sr1.2(NiFe)O4-δ(PSNF-NFA) cathode material constructed by the in-situ exsolution method was used for direct CO2 electrolysis. XRD and SEM analysis proved that the exsolution of the NiFe alloy will cause the matrix to undergo phase transformation, and the exsolved nanoparticles are abundant and uniformly distributed. The interface between the nanoparticles and the perovskite oxide matrix has abundant oxygen vacancies, which can enhance the chemical adsorption and dissociation of CO2, and significantly improve the performance of CO2 electrolysis. The new composite cathode shows a current density of 2.5A cm-2 at 800 ℃ and 1.6 V. In addition, the PSNF-NFA cathode also shows good stability and coking resistance to direct CO2 electrolysis.