Hydrogen production through steam electrolysis: Model-based steady state performance of a cathode-supported intermediate temperature solid oxide electrolysis cell
Hydrogen production through steam electrolysis: Model-based steady state performance of a cathode-supported intermediate temperature solid oxide electrolysis cell
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DOI：
10.1016/j.jpowsour.2006.12.081
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发表时间：
2007-03-30
影响因子：
9.2
通讯作者：
Brandon, N. P.
中科院分区：
文献类型：
--
作者：
Udagawa, J.;Aguiar, P.;Brandon, N. P.
通过蒸汽电解制氢可以涉及比常规低温水电解更少的电能消耗，反映了在高温下改进的热力学和动力学。本文报道了阴极支撑的平面中温固体氧化物电解电池（SOEC）堆的一维动态模型的发展。该模型，其中包括一个电化学模型，质量平衡，和四个能量平衡，在这里被用来研究在不同的电流密度和温度下的SOEC堆的稳态行为。模拟发现激活过电位。对不可逆损耗的贡献最大，而在整个电池堆中浓度过电位保持可忽略不计。对于7000 A m（-2）的平均电流密度和1023 K的入口蒸汽温度，电池堆的预测电能消耗为约3 kW h/正常氢，显著小于目前市售的低温电池堆。然而，堆温度分布对平均电流密度的依赖性要求严格的温度控制，特别是在动态操作期间。(c)2007 Elsevier B. V.保留所有权利。
Hydrogen production via steam electrolysis may involve less electrical energy consumption than conventional low temperature water electrolysis, reflecting the improved thermodynamics and kinetics at elevated temperatures. The present paper reports on the development of a one-dimensional dynamic model of a cathode-supported planar intermediate temperature solid oxide electrolysis cell (SOEC) stack. The model, which consists of an electrochemical model, a mass balance, and four energy balances, is here employed to study the steady state behaviour of an SOEC stack at different current densities and temperatures. The simulations found that activation overpotentials. provide the largest contributions to irreversible losses while concentration overpotentials remained negligible throughout the stack. For an average current density of 7000 A m(-2) and an inlet steam temperature of 1023 K, the predicted electrical energy consumption of the stack is around 3 kW h per normal in 3 of hydrogen, significantly smaller than those of low temperature stacks commercially available today. However, the dependence of the stack temperature distribution on the average current density calls for strict temperature control, especially during dynamic operation. (c) 2007 Elsevier B.V. All rights reserved.