Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10625832 | Ceramics International | 2014 | 9 Pages |
Abstract
The 30-cell nickel-yttria stabilized zirconia (Ni-YSZ) hydrogen electrode-supported planar solid oxide electrolyzer (SOE) stack modules were manufactured and tested at 800 °C in steam electrolysis mode for hydrogen production. The electrolysis efficiency of the stack modules was higher than 100% at a total steam and hydrogen flow of 2.1 sccm cmâ2, a H2O/H2 ratio of 80/20, and a current density of <0.2 A cmâ2. The electrolysis efficiency, current efficiency, and actual hydrogen production rate of the stack modules increased with increasing H2O/H2 ratio at a constant current density. However, the electrolysis and current efficiencies decreased steadily at high current densities. During hydrogen production, the stack modules were operated at 800 °C and a constant current density of 0.15 A cmâ2 for up to 1100 h. A steam conversion rate of 62% and current efficiency of 87.4% were obtained; the actual hydrogen production rate reached as high as 103.6 N L hâ1. Post-mortem analysis showed that delamination of the LSM-YSZ oxygen electrode mainly occurred in the steam and air inlet area of the 10Ã10 cm2 cells.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yifeng Zheng, Qingshan Li, Wanbin Guan, Cheng Xu, Wei Wu, Wei Guo Wang,