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Influence of the competing effects between reaction, diffusion, and advection on the performance of solid oxide electrolyzers
Journal of Power Sources ( IF 9.2 ) Pub Date : 2021-02-24 , DOI: 10.1016/j.jpowsour.2021.229675
Anders S. Nielsen , Jon G. Pharoah

In solid oxide electrolyzers, the transport of species to and from the electrochemical reaction sites plays an important role in governing their performance and efficiency. The competing effects between diffusive, advective, and reactive transport on such metrics, however, are seldom considered in their design and analysis. Additionally, these devices possess a wide range of design specifications and operating conditions, therefore making it difficult to draw meaningful comparisons between the results presented in different studies. Here, we introduce a comprehensive approach for the design, evaluation, and comparison of solid oxide electrolyzers. A scaling analysis of the transport phenomena is undertaken to develop dimensionless ratios that characterize the delivery and removal of species at the electrochemical reaction sites. These dimensionless ratios elucidate when certain transport mechanisms are inconsequential to the performance of solid oxide electrolyzers, and reveal how concentrations gradients and overpotentials scale with parameters such as flow velocity, reaction rates, and geometry. This analysis offers designers and researchers an effective approach to identify rate-limiting mechanisms that inhibit the performance of solid oxide electrolyzers, and allows for direct comparisons to be made between cells of varying geometry, operating conditions, reactant and product species, and catalytic materials.



中文翻译:

反应,扩散和对流之间竞争效应对固体氧化物电解槽性能的影响

在固体氧化物电解槽中,物质往返于电化学反应部位的传输在控制其性能和效率方面起着重要作用。但是,在设计,分析中很少考虑扩散,对流和反应性传输之间对此类度量的竞争影响。此外,这些设备具有广泛的设计规格和工作条件,因此很难在不同研究中得出的结果之间进行有意义的比较。在这里,我们介绍一种用于固体氧化物电解槽的设计,评估和比较的综合方法。进行了迁移现象的定标分析,以开发无量纲的比率,该比率表征了在电化学反应位点处物质的传递和去除。当某些传输机制与固体氧化物电解槽的性能无关紧要时,这些无量纲的比率得以阐明,并揭示了浓度梯度和超电势如何随诸如流速,反应速率和几何形状等参数缩放。该分析为设计人员和研究人员提供了一种有效的方法,以识别抑制固体氧化物电解槽性能的限速机制,并可以在不同几何形状,运行条件​​,反应物和产物种类以及催化材料之间进行直接比较。

更新日期:2021-02-24
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