Current Leakage and Faradaic Efficiency Simulation of Proton-Conducting Solid Oxide Electrolysis Cells
Current Leakage and Faradaic Efficiency Simulation of Proton-Conducting Solid Oxide Electrolysis Cells
复制标题
质子传导固体氧化物电解槽的电流泄漏和法拉第效率模拟
DOI：
10.1149/11106.1159ecst
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Shoukry, Yasser
中科院分区：
文献类型：
--
作者：
Jin, Xinfang;Shoukry, Yasser
本研究将表面缺陷化学反应与带电粒子输运耦合，模拟了BZY电解质支撑的质子传导固体氧化物电池。我们验证了模型参数的OH g浓度作为温度的函数，干和湿氧下的电导率作为氧分压和温度的函数。结果表明，高的电子空穴迁移率（扩散率）是导致高温下高漏电流的主要原因。法拉第效率在低操作电压或高温下保持低或甚至为负，并且随着电池电压增加而稳定。在这项研究中开发的模型是一个有用的工具，以了解BZY电解质中的泄漏电流，并提供设计策略，以避免/减轻这种显着的低效率的水电解操作。
In this study, we simulated BZY electrolyte supported protonconducting solid oxide cell by coupling surface defect chemistry reaction with charged species transport. We validated the model parameters by OH g concentration as a function of temperature, conductivity under dry and wet oxygen as a function of oxygen partial pressure and temperature. The results indicate that the high electron hole mobility (diffusivity) is mainly responsible for the high leaking current under high temperature. The Faradaic efficiency stays low or even negative under low operating voltage or high temperature and plateaus as the cell voltage increases. The model developed in this study is a useful tool to understand the leaking current in BZY electrolyte and provide design strategies to avoid/mitigate such significant inefficiency for water electrolysis operation.