A molecular theory for optimal blue energy extraction by electrical double layer expansion
Abstract
We proposed the electrical double layer expansion (CDLE) as a promising alternative to reverse electrodialysis (RED) and pressure retarded osmosis (PRO) processes for extracting osmotic power generated by the salinity difference between freshwater and seawater. The performance of the CDLE process is sensitive to the configuration of porous electrodes and operation parameters for ion extraction and release cycles. In our work, we use a classical density functional theory (CDFT) to examine how the electrode pore size and charging/discharging potentials influence the thermodynamic efficiency of the CDLE cycle. The existence of an optimal charging potential that maximizes the energy output for a given pore configuration is predicted, which varies substantially with the pore size, especially when it is smaller than 2 nm. Finally, the thermodynamic efficiency is maximized when the electrode has a pore size about twice the ion diameter.
- Authors:
-
- Univ. of California, Riverside, CA (United States); Tsinghua Univ., Beijing (China)
- Univ. of California, Riverside, CA (United States)
- Tsinghua Univ., Beijing (China)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1265857
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Chemistry Chemical Physics. PCCP
- Additional Journal Information:
- Journal Volume: 17; Journal Issue: 37; Journal ID: ISSN 1463-9076
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Kong, Xian, Gallegos, Alejandro, Lu, Diannan, Liu, Zheng, and Wu, Jianzhong. A molecular theory for optimal blue energy extraction by electrical double layer expansion. United States: N. p., 2015.
Web. doi:10.1039/C5CP03514G.
Kong, Xian, Gallegos, Alejandro, Lu, Diannan, Liu, Zheng, & Wu, Jianzhong. A molecular theory for optimal blue energy extraction by electrical double layer expansion. United States. https://doi.org/10.1039/C5CP03514G
Kong, Xian, Gallegos, Alejandro, Lu, Diannan, Liu, Zheng, and Wu, Jianzhong. Wed .
"A molecular theory for optimal blue energy extraction by electrical double layer expansion". United States. https://doi.org/10.1039/C5CP03514G. https://www.osti.gov/servlets/purl/1265857.
@article{osti_1265857,
title = {A molecular theory for optimal blue energy extraction by electrical double layer expansion},
author = {Kong, Xian and Gallegos, Alejandro and Lu, Diannan and Liu, Zheng and Wu, Jianzhong},
abstractNote = {We proposed the electrical double layer expansion (CDLE) as a promising alternative to reverse electrodialysis (RED) and pressure retarded osmosis (PRO) processes for extracting osmotic power generated by the salinity difference between freshwater and seawater. The performance of the CDLE process is sensitive to the configuration of porous electrodes and operation parameters for ion extraction and release cycles. In our work, we use a classical density functional theory (CDFT) to examine how the electrode pore size and charging/discharging potentials influence the thermodynamic efficiency of the CDLE cycle. The existence of an optimal charging potential that maximizes the energy output for a given pore configuration is predicted, which varies substantially with the pore size, especially when it is smaller than 2 nm. Finally, the thermodynamic efficiency is maximized when the electrode has a pore size about twice the ion diameter.},
doi = {10.1039/C5CP03514G},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 37,
volume = 17,
place = {United States},
year = {Wed Aug 19 00:00:00 EDT 2015},
month = {Wed Aug 19 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
Study of a water-graphene capacitor with molecular density functional theory
journal, September 2019
- Jeanmairet, Guillaume; Rotenberg, Benjamin; Borgis, Daniel
- The Journal of Chemical Physics, Vol. 151, Issue 12
Blue Energy and Desalination with Nanoporous Carbon Electrodes: Capacitance from Molecular Simulations to Continuous Models
journal, April 2018
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- Physical Review X, Vol. 8, Issue 2