Issue 2, 2020

Energy recovery in capacitive deionization systems with inverted operation characteristics

Abstract

Capacitive deionization (CDI) operated under inverted mode involves electronic charging and discharge steps with corresponding ion concentration and desalting coupled with simultaneous energy storage. In this work, an energy recovery system derived from a Ćuk dc–dc converter is explored to transfer the energy stored from one inverted capacitive deionization (i-CDI) cell during the electronic discharge step to another during the charge step, decreasing the overall energy requirement for capacitive water desalination. The i-CDI cell, a subset of CDI architecture operated in an inverted mode, is improved by incorporating ion-selective membranes to allow inverted membrane capacitive deionization (i-MCDI), leading to enhanced charge storage achieved with reduced energy input. For example, in comparison to i-CDI that requires ∼12 J g−1 of energy input, the i-MCDI cell requires only 8 J g−1. By incorporating the recovery system, the energy penalty can be reduced to only require ∼8 and 4 J g−1 for i-CDI and i-MCDI cells, respectively. Improvement in energy recovery was shown to be achieved by reducing charge leakage, with the i-MCDI cell showing up to 3 times the leakage resistance of the i-CDI cell.

Graphical abstract: Energy recovery in capacitive deionization systems with inverted operation characteristics

Supplementary files

Article information

Article type
Paper
Submitted
10 sen 2019
Accepted
26 okt 2019
First published
28 okt 2019

Environ. Sci.: Water Res. Technol., 2020,6, 321-330

Author version available

Energy recovery in capacitive deionization systems with inverted operation characteristics

A. Omosebi, Z. Li, N. Holubowitch, X. Gao, J. Landon, A. Cramer and K. Liu, Environ. Sci.: Water Res. Technol., 2020, 6, 321 DOI: 10.1039/C9EW00797K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements