流通式电极电容去离子水淡化的一维模型
A one-dimensional model for water desalination by flow-through electrode capacitive deionization
摘要：
电容去离子（CDI）是一种快速发展的水脱盐技术，其中多孔碳电极上约1 V的小电池电压通过电吸附从给水中去除盐。在流通电极（FTE）CDI电解槽结构中，给水通过多孔电极中的大孔或激光穿孔通道泵送，从而实现具有平行流和电场的高度紧凑的电解槽，以及快速除盐。在这里，我们提出了一个一维模型，描述水脱盐的FTE CDI，并从一个定制的实验单元的数据进行比较。该模型采用简单的细胞边界条件通过缩放参数。我们表现出良好的模型到数据拟合与合理的值拟合参数，如斯特恩层电容，体积，和吸引力的能量。因此，我们证明，从工程建模的角度来看，FTE CDI电池可以用更简单的一维模型来描述，不像更典型的电极之间的流动结构，其中需要2D模型。
英文摘要：
Capacitive deionization (CDI) is a fast-emerging water desalination technology in which a small cell voltage of ~1 V across porous carbon electrodes removes salt from feedwaters via electrosorption. In flow-through electrode (FTE) CDI cell architecture, feedwater is pumped through macropores or laser perforated channels in porous electrodes, enabling highly compact cells with parallel flow and electric field, as well as rapid salt removal. We here present a one-dimensional model describing water desalination by FTE CDI, and a comparison to data from a custom-built experimental cell. The model employs simple cell boundary conditions derived via scaling arguments. We show good model-to-data fits with reasonable values for fitting parameters such as the Stern layer capacitance, micropore volume, and attraction energy. Thus, we demonstrate that from an engineering modeling perspective, an FTE CDI cell may be described with simpler one-dimensional models, unlike more typical flow-between electrodes architecture where 2D models are required.
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