Energy recovery in capacitive deionization systems with inverted operation characteristics

Omosebi, Ayokunle; Li, Zhiao; Holubowitch, Nicolas; Gao, Xin; Landon, James; Cramer, Aaron; Liu, Kunlei

doi:10.1039/c9ew00797k

Energy recovery in capacitive deionization systems with inverted operation characteristics

Journal Article · Mon Oct 28 00:00:00 EDT 2019 · Environmental Science: Water Research & Technology

DOI:https://doi.org/10.1039/c9ew00797k· OSTI ID:1801349

^[1]; Li, Zhiao ^[2]; Holubowitch, Nicolas ^[3]; ^[4]; ^[5]; ^[6]; Liu, Kunlei ^[7]

Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research; OSTI
Tsinghua Univ., Beijing (China). Dept. of Electrical Engineering
Texas A & M Univ., Corpus Christi, TX (United States). Dept. of Physical and Environmental Sciences
Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research
Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research. Dept. of Chemical and Materials Engineering
Univ. of Kentucky, Lexington, KY (United States). Dept. of Electrical and Computer Engineering
Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research. Dept. of Mechanical Engineering

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 Cuk 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.

View Accepted Manuscript (DOE)

Research Organization:: West Virginia Univ., Morgantown, WV (United States)

Sponsoring Organization:: USDOE; USDOE Office of International Affairs (IA)

Grant/Contract Number:: PI0000017

OSTI ID:: 1801349

Alternate ID(s):: OSTI ID: 1572732

Journal Information:: Environmental Science: Water Research & Technology, Journal Name: Environmental Science: Water Research & Technology Journal Issue: 2 Vol. 6; ISSN 2053-1400

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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