LSCF-GDC氧电极固体氧化物电堆高温蒸汽电解制氢性能研究

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

为研究基于LSCF-GDC氧电极的固体氧化物电解池堆的电解性能,自制了30单元(10 cm×10 cm)的平板式电解电堆,通过改变固体氧化物电解池堆的操作温度、水蒸气含量、气体流量等条件,记录不同条件下电解的极化曲线。分析操作条件对高温电解水蒸气极化的影响,并计算电解制氢的系统效率。结果表明较高的温度、水蒸气含量、水蒸气流量,以及氧电极空气的通入有利于降低过电位;在800℃,通入6 L×min^(-1) 90%湿度的氢气,电解电压为1.27 V时,系统效率达到最大值80.8%,此时电堆的产氢速率为4.57 L×min^(-1)。

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.