Title: 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 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.

Authors:

Omosebi, Ayokunle  ^[1];

• Search DOE PAGES for author "Omosebi, Ayokunle"
• Search DOE PAGES for ORCID "0000-0003-0290-8736"

Li, Zhiao ^[2]; Holubowitch, Nicolas ^[3]; Gao, Xin  ^[1];

• Search DOE PAGES for author "Gao, Xin"
• Search DOE PAGES for ORCID "0000-0002-8865-1697"

Landon, James  ^[4];

• Search DOE PAGES for author "Landon, James"
• Search DOE PAGES for ORCID "0000-0001-8113-5166"

Cramer, Aaron  ^[5];

• Search DOE PAGES for author "Cramer, Aaron"
• Search DOE PAGES for ORCID "0000-0003-4850-8252"

Liu, Kunlei ^[6]

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+ Show Author Affiliations

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

Publication Date:

Mon Oct 28 00:00:00 EDT 2019

Research Org.:

West Virginia Univ., Morgantown, WV (United States)

Sponsoring Org.:

USDOE Office of International Affairs (IA)

OSTI Identifier:

1801349

Alternate Identifier(s):

OSTI ID: 1572732

Grant/Contract Number:  

PI0000017

Resource Type:

Accepted Manuscript

Journal Name:

Environmental Science: Water Research & Technology

Additional Journal Information:

Journal Volume: 6; Journal Issue: 2; Journal ID: ISSN 2053-1400

Publisher:

Royal Society of Chemistry

Country of Publication:

United States

Language:

English

Subject:

54 ENVIRONMENTAL SCIENCES