期刊
ELECTROCHIMICA ACTA
卷 130, 期 -, 页码 718-727出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.03.102
关键词
SOEC; YSZ; Modeling; Electronic conductivity; Co-electrolysis
资金
- National Research Foundation, Singapore
We report on the consequences of operating Solid Oxide Electrolyzer Cell (SOEC) under an extreme electrical polarization or with a low supply of feedstock chemicals. Under such conditions, subsequent switching from dominantly ionic conductivity to mixed conductivity is lowering the cells' Faradic efficiency. We propose a theoretical model, able to accurately predict polarization curve, Faradic efficiency and synthetic fuel production for Zirconia electrolyte-based (8YSZ) cells. To the best of our knowledge this is the first model of SOEC constructed without the assumption of pure ionic conductivity in YSZ. Experimental results from literature were used to extrapolate, fit and validated 8YSZ properties for oxygen partial pressure below 10(-20) atm. We report a simple fuel map, suggesting design conditions for SOEC, securing the operation with near 100% Faradic efficiency. This consideration suggests strong evidence against a common practice of using Faraday's law to estimate electrolysis yield. Moreover, we speculate that surge of potential difference at high current densities may be due to a switch to the mixed conduction mode, rather than only the concentration loss. (C) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据