SHAO Le ¹, WANG Shaorong ²
(1. Shaanxi Coal Chemical Industry Technology Research Institute Co., Ltd., Xi’an 710005, Shaanxi, China; 2. School of Chemical
Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China)

Abstract: Tubular solid oxide electrolysis cells (SOECs) were fabricated by dip-coating and co-sintering method, and their electrochemical properties were investigated both in fuel cell and electrolysis modes. The results showed the maximum power density of the tubular SOEC could reach 493 mW·cm^-2 at 850 ℃ in fuel cell mode, and the hydrogen utilization rate was 73%. The hydrogen production rate was 146 mL·h^-1·cm^-2 at 1.5 V and 850 ℃ in electrolysis mode. EIS results indicated that the water steam diffusion resistance caused by the microstructure of hydrogen electrode is the main reason that restricts the performance of the electrolyte.

Key words: solid oxide electrolysis cells; water electrolysis; hydrogen production