Author(s): Darling, RM; Shiau, HS; Weber, AZ; Perry, ML | Abstract: © The Author(s) 2017. Published by ECS. All rights reserved. Shunt currents occur in electrochemical reactors like flow batteries, electrolyzers, and fuel cells where many bipolar cells that are connected in series electrically contact a mobile electrolyte through one or more common fluid distribution manifolds. Shunt currents reduce energy efficiency, and can cause unwanted side reactions including corrosion and gas generation. Equivalent-circuit models have been widely used to examine shunt currents in multi-cell electrochemical reactors. However, a detailed investigation of the interesting electrochemical processes occurring at the edges of the active areas has not been presented. In this work, the generation of shunt currents and their tendency to drive corrosion at the edges of positive electrodes in the most positive cells in a reactor stack are investigated with a comprehensive numerical model. An analytical model based on the penetration of current into a semi-infinite electrode, that can be used in conjunction with traditional equivalent-circuit models to assess the tendency for shunt currents to drive corrosion, is developed and compared to the numerical model. The models provided here can be used to set requirements on maximum allowable port currents in order to achieve a particular durability goal.

中文翻译：

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液流电池中分流电流与边缘腐蚀的关系

作者（S）：亲爱的，RM；肖，HS；韦伯，亚利桑那州；佩里，ML | 摘要：© The Author(s) 2017。ECS 出版。版权所有。分流电流出现在电化学反应器中，例如液流电池、电解器和燃料电池，其中许多串联连接的双极电池通过一个或多个常见的流体分配歧管与移动电解质电接触。分流电流会降低能效，并可能导致有害的副反应，包括腐蚀和气体生成。等效电路模型已广泛用于检查多电池电化学反应器中的分流电流。然而，尚未提出对发生在活性区域边缘的有趣电化学过程的详细研究。在这项工作中，使用综合数值模型研究了分流电流的产生及其在反应堆堆中最正极的电池中正极边缘腐蚀的趋势。开发了一种基于电流渗透到半无限电极的分析模型，该模型可与传统等效电路模型结合使用，以评估分流电流驱动腐蚀的趋势，并与数值模型进行比较。此处提供的模型可用于设置对最大允许端口电流的要求，以实现特定的耐用性目标。可与传统等效电路模型结合使用以评估分流电流驱动腐蚀的趋势，并与数值模型进行比较。此处提供的模型可用于设置对最大允许端口电流的要求，以实现特定的耐用性目标。可与传统等效电路模型结合使用以评估分流电流驱动腐蚀的趋势，并与数值模型进行比较。此处提供的模型可用于设置对最大允许端口电流的要求，以实现特定的耐用性目标。