Theoretical study on pressurized operation of solid oxide electrolysis cells

被引：46
作者：
Henke, Moritz [1 ]
Willich, Caroline [1 ]
Kallo, Josef [1 ]
Friedrich, K. Andreas [1 ,2 ]
机构：
[1] German Aerosp Ctr DLR, Inst Tech Thermodynam, D-70569 Stuttgart, Germany
[2] Univ Stuttgart, Inst Thermodynam & Thermal Engn, D-70550 Stuttgart, Germany
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2014年 / 39卷 / 24期
关键词：
Solid oxide electrolysis cell; Pressure; Power density; Efficiency; SOEC; Pressurized SOEC; FUEL-CELLS; HYDROGEN; POWER; SOFC;
D O I：
10.1016/j.ijhydene.2014.05.185
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this paper the influence of pressure on the performance of solid oxide electrolysis cells is theoretically analyzed in a pressure range between 0.05 and 2 MPa. A previously validated electrochemical model of a solid oxide fuel cell stack is used to predict electrolysis behavior. The effect of pressure on thermodynamics, kinetics and gas diffusion is discussed. It is shown that thermodynamics are negatively influenced by an increase in pressure whereas kinetics and gas transport are improved. Overall pressure effects are therefore only small. At low current density the electrolysis cell shows better performance at low pressure whereas performance improves with pressure at high current densities. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：12434 / 12439
页数：6
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