Performance of Solid Oxide Electrolysis Stack with LSCF-GDC Oxygen Electrodes in Hydrogen Production from High Temperature Steam

A 30-cell (10 cm*10 cm) solid oxide electrolysis stack was prepared to study high temperature steam electrolysis performance of solid oxide electrolysis stack based on LSCF-GDC oxygen electrodes. Hydrogen production was investigated under different temperatures, electrode gas contents and flow rates, and the effects of experiment conditions on the polarization of high temperature steam electrolysis were analyzed, with electrolysis efficiency calculated. Experimental results show that higher operation temperature, steam concentration and gas flow rates, and oxygen electrode feeding with air are helpful in reducing electrolysis over potential. The maximum efficiency of 80.8% is achieved under conditions of 800℃, 6 L·min~(-1) of 90% RH hydrogen gas and 1.27 V electrolytic voltage, and the hydrogen production rate is 4.57 L·min~(-1).