A novel fuel electrode enabling direct CO2 electrolysis with excellent and stable cell performance

作者：Li, Yihang; Hu, Bobing; Xia, Changrong^*; Xu, Wayne Q.; Lemmon, John P.; Chen, Fanglin

来源：Journal of Materials Chemistry A, 2017, 5(39): 20833-20842.

DOI：10.1039/c7ta05750d

• CARBON-DIOXIDE ELECTROLYSIS
• TEMPERATURE STEAM ELECTROLYSIS
• IN-SITU GROWTH
• ELECTRODE/ELECTROLYTE INTERFACE
• OXYGEN REDUCTION
• ANODE MATERIAL
• OXIDE
• NANOPARTICLES
• CATHODE
• SURFACE

Solid oxide electrolysis cells (SOECs) can directly convert CO2 to CO and O-2 that are important building blocks for chemical production and other applications. However, the use of SOECs for direct CO2 electrolysis has been hampered mainly due to the absence of a stable, highly catalytically active and cost effective cathode (fuel electrode) material. Here we report a ceramic SOEC cathode material of perovskite-structured Sr1.9Fe1.5Mo0.4Ni0.1O6-delta for direct CO2 electrolysis. By annealing at 800 degrees C in H-2, homogeneously dispersed nano-sized NiFe alloy nanoparticles are exsolved from the Sr1.9Fe1.5Mo0.4Ni0.1O6-delta perovskite lattice. The exsolved NiFe nanoparticles significantly enhance the chemical adsorption and surface reaction kinetics of CO2 with the cathode. SOECs with the novel cathode have demonstrated a peak current density of 2.16 A cm(-2) under an applied voltage of 1.5 V at 800 degrees C and have demonstrated stable direct CO2 electrolysis performance during 500 h of operation under current density above 1 A cm(-2) at 800 degrees C.

• 出版日期2017-10-21
• 单位北京低碳清洁能源研究所; 中国科学技术大学; 中国科学院