Volume Averaging Study of the Capacitive Deionization Process in Homogeneous Porous Media
- Prairie View A&M Univ., TX (United States). Dept. of Chemical Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Ion storage in porous electrodes is important in applications such as energy storage by supercapacitors, water purification by capacitive deionization, extraction of energy from a salinity difference and heavy ion purification. In this paper, a model is presented to simulate the charge process in homogeneous porous media comprising big pores. It is based on a theory for capacitive charging by ideally polarizable porous electrodes without faradaic reactions or specific adsorption of ions. A volume averaging technique is used to derive the averaged transport equations in the limit of thin electrical double layers. Transport between the electrolyte solution and the charged wall is described using the Gouy–Chapman–Stern model. The effective transport parameters for isotropic porous media are calculated solving the corresponding closure problems. Finally, the source terms that appear in the average equations are calculated using numerical computations. An alternative way to deal with the source terms is proposed.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-0096OR22725
- OSTI ID:
- 1286684
- Journal Information:
- Transport in Porous Media, Vol. 109, Issue 1; ISSN 0169-3913
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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