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Preferential Ion Adsorption in Blue Energy Applications

Balzer, Christopher and Qing, Leying and Wang, Zhen-Gang (2021) Preferential Ion Adsorption in Blue Energy Applications. ACS Sustainable Chemistry & Engineering, 9 (28). pp. 9230-9239. ISSN 2168-0485. doi:10.1021/acssuschemeng.1c01326. https://resolver.caltech.edu/CaltechAUTHORS:20210728-155607490

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Abstract

The available blue energy (or salinity gradient energy) in a capacitive double-layer expansion (CDLE) process is directly determined by the interplay between adsorption and release of ions from the electrodes at different salt concentrations. In this work, we explore the effect of asymmetric preferential ion adsorption at nanoporous anode and cathode surfaces as a means to enhance the available blue energy. We find that preferential adsorption can not only enhance the available energy output but also shift the supplied potential difference in the CDLE process toward the “spontaneous voltage”. We determine the maximum available energy for the CDLE process as a function of the pore size and the degree of asymmetric adsorption. In the mixing of river water and saltwater, we find that preferential adsorption can give as much as 10% more available energy compared to indifferent electrode surfaces.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acssuschemeng.1c01326DOIArticle
ORCID:
AuthorORCID
Balzer, Christopher0000-0002-9767-8437
Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 2021 American Chemical Society. Received: February 25, 2021; Revised: June 17, 2021; Published: July 7, 2021. C.B. is supported by the U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing Research, Department of Energy Computational Science Graduate Fellowship, under award number DE-SC0020347. L.Q. is grateful to the China Scholarship Council. Author Contributions: C.B. and L.Q. contributed equally. The authors declare no competing financial interest.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0020347
China Scholarship CouncilUNSPECIFIED
Subject Keywords:capacitive mixing, alternative energy, density functional theory, preferential adsorption, electric double layer, thermodynamics
Issue or Number:28
DOI:10.1021/acssuschemeng.1c01326
Record Number:CaltechAUTHORS:20210728-155607490
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210728-155607490
Official Citation:Preferential Ion Adsorption in Blue Energy Applications. Christopher Balzer, Leying Qing, and Zhen-Gang Wang. ACS Sustainable Chemistry & Engineering 2021 9 (28), 9230-9239; DOI: 10.1021/acssuschemeng.1c01326
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110049
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Aug 2021 19:18
Last Modified:02 Aug 2021 19:18

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