Development of a two-dimensional coupled-implicit numerical tool for the optimal design of CDI electrodes

摘要: Abstract Capacitive deionization, CDI, is a new desalination technology which gained interest recently due to its economic advantages over existing technologies. To develop better electrode materials, this study focused on revealing CDI mechanisms and the most effective parameters. As current experimental techniques have limitations in producing well-defined pore arrangements, multi-dimensional transient simulation tool was developed based solving Nernst–Planck equation with convection term Poisson's equation. The equations are solved using coupled-implicit scheme, does not require very short time step convergence problem. present verified through comparisons theoretical solutions other results. key performance indicator (KPI) defined as salt removal rate under fixed external surface area, relates capital cost of an electrode. effects design parameters KPI studied regarding gap distance, depth, diffusion coefficient, width, flow velocity stagnant water flowing conditions. It found that coefficient width were influential KPI, while distance had relatively small KPI.