کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6478789 | 1428099 | 2017 | 9 صفحه PDF | دانلود رایگان |
- BCFN was applied on traditional YSZ electrolyte with GDC interlayer.
- Dense YSZ-GDC bilayer electrolyte was obtained by co-sintering at 1300 °C.
- Area specific resistance of full cell is 0.195 Ω cm2 at 800 °C with 60% water vapor.
- Cell voltage is 1.13 V at 1 A cmâ2 at 800 °C with feedstock of 60% H2O-40% H2.
- The electricity to hydrogen efficiency is 73% with generation rate of 4180Â LÂ hâ1Â mâ2.
In this work, Solid Oxide Electrolyzer Cell (SOEC) based on Ba0.9Co0.7Fe0.2Nb0.1O3-δ (BCFN) air electrode and YSZ-GDC bilayer electrolyte was systematically investigated and the efficiency of high-temperature water electrolysis by such a cell was analyzed. Firstly, chemical compatibility test between BCFN and YSZ showed that BaZrO3 formed after heat treatment at 1000 °C for 5 h, which adversely influenced the performance of BCFN dramatically. A fully dense GDC interlayer was thus developed by co-sintering GDC layer, with addition of 0.5 at.% Fe2O3, with YSZ electrolyte at only 1300 °C. The as-prepared fuel electrode-supported eletrolyzer cell consisting of Ni-YSZ fuel electrode, YSZ-GDC bilayer electrolyte and BCFN air electrode was evaluated for water electrolysis. Specifically, at 800 °C using a feedstock of 60% H2O-40% H2, the cell showed total area specific resistance of 0.195 Ω cm2 and the cell voltage was 1.13 V with an electrolysis current of 1 A cmâ2. After short-term stability test for 120 h with 1 A cmâ2 electrolysis current at 800 °C, the cell showed no microstructural changes as observed by scanning electron microscopy. At last, a high-temperature water electrolysis system based on the cell studied was proposed and the system analysis shows that the overall electricity to hydrogen efficiency can reach 73% based on lower heating value of hydrogen, with a hydrogen generation rate of 4180 L hâ1 mâ2.
Journal: Applied Energy - Volume 191, 1 April 2017, Pages 559-567