Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published July 19, 2021 | Supplemental Material
Journal Article Open

Preferential Ion Adsorption in Blue Energy Applications


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.

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.

Attached Files

Supplemental Material - sc1c01326_si_001.pdf


Files (3.2 MB)
Name Size Download all
3.2 MB Preview Download

Additional details

August 20, 2023
October 23, 2023