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Effect of Mg2+ions on energy generation by Reverse Electrodialysis

Avci, Ahmet H. LU ; Sarkar, Pinkey ; Tufa, Ramato A. ; Messana, Diego ; Argurio, Pietro ; Fontananova, Enrica ; Di Profio, Gianluca and Curcio, Efrem (2016) In Journal of Membrane Science 520. p.499-506
Abstract

Reverse Electrodialysis is today recognized as one of the most promising technology to harvest Salinity Gradient Power (SGP-RE). However, the effectiveness of SGP-RE in real practice is still not clearly defined due to the lack of specific studies in literature, being in large part limited to investigations on pure NaCl solutions. In this work we experimentally investigated the effect of Mg2+, the most abundant cation in natural water after Na+, on SGP-RE performance by power measurements on a lab-scale stack prototype. Maximum power density ranged from 1.06 W/m2 MP(MP: membrane pair) - generated when feeding SGP-RE prototype with 0.5 molal//4 molal NaCl, to 0.06... (More)

Reverse Electrodialysis is today recognized as one of the most promising technology to harvest Salinity Gradient Power (SGP-RE). However, the effectiveness of SGP-RE in real practice is still not clearly defined due to the lack of specific studies in literature, being in large part limited to investigations on pure NaCl solutions. In this work we experimentally investigated the effect of Mg2+, the most abundant cation in natural water after Na+, on SGP-RE performance by power measurements on a lab-scale stack prototype. Maximum power density ranged from 1.06 W/m2 MP(MP: membrane pair) - generated when feeding SGP-RE prototype with 0.5 molal//4 molal NaCl, to 0.06 W/m2 MP- measured when using 0.5 molal//4 molal MgCl2solutions. Likewise, open circuit voltage decreased from 1.70 to 0.72 V. Evidence of uphill transport in the range of 0–30% MgCl2was confirmed by Ion Chromatography analysis carried out on inlet and outlet streams of SGP-RE stack. Electrochemical Impedance Spectroscopy analysis revealed that cation exchange membrane resistance was critically affected by Mg2+concentration: membrane resistance, from a value of 2.41 Ω cm2in pure NaCl solution, increased tenfold in pure MgCl2 solution.

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author
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electrochemical Impedance Spectroscopy, Multi-ion solutions, Reverse Electrodialysis, Salinity Gradient Power
in
Journal of Membrane Science
volume
520
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:84982170132
ISSN
0376-7388
DOI
10.1016/j.memsci.2016.08.007
language
English
LU publication?
no
additional info
Publisher Copyright: © 2016 Elsevier B.V.
id
dd9aaafb-04d9-4875-95e4-8eb2429d75a3
date added to LUP
2022-05-13 10:50:18
date last changed
2022-05-18 11:36:40
@article{dd9aaafb-04d9-4875-95e4-8eb2429d75a3,
  abstract     = {{<p>Reverse Electrodialysis is today recognized as one of the most promising technology to harvest Salinity Gradient Power (SGP-RE). However, the effectiveness of SGP-RE in real practice is still not clearly defined due to the lack of specific studies in literature, being in large part limited to investigations on pure NaCl solutions. In this work we experimentally investigated the effect of Mg<sup>2+</sup>, the most abundant cation in natural water after Na<sup>+</sup>, on SGP-RE performance by power measurements on a lab-scale stack prototype. Maximum power density ranged from 1.06 W/m<sup>2</sup>                         <sub>MP</sub>(MP: membrane pair) - generated when feeding SGP-RE prototype with 0.5 molal//4 molal NaCl, to 0.06 W/m<sup>2</sup>                         <sub>MP</sub>- measured when using 0.5 molal//4 molal MgCl<sub>2</sub>solutions. Likewise, open circuit voltage decreased from 1.70 to 0.72 V. Evidence of uphill transport in the range of 0–30% MgCl<sub>2</sub>was confirmed by Ion Chromatography analysis carried out on inlet and outlet streams of SGP-RE stack. Electrochemical Impedance Spectroscopy analysis revealed that cation exchange membrane resistance was critically affected by Mg<sup>2+</sup>concentration: membrane resistance, from a value of 2.41 Ω cm<sup>2</sup>in pure NaCl solution, increased tenfold in pure MgCl<sub>2</sub> solution.</p>}},
  author       = {{Avci, Ahmet H. and Sarkar, Pinkey and Tufa, Ramato A. and Messana, Diego and Argurio, Pietro and Fontananova, Enrica and Di Profio, Gianluca and Curcio, Efrem}},
  issn         = {{0376-7388}},
  keywords     = {{Electrochemical Impedance Spectroscopy; Multi-ion solutions; Reverse Electrodialysis; Salinity Gradient Power}},
  language     = {{eng}},
  month        = {{12}},
  pages        = {{499--506}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Membrane Science}},
  title        = {{Effect of Mg<sup>2+</sup>ions on energy generation by Reverse Electrodialysis}},
  url          = {{http://dx.doi.org/10.1016/j.memsci.2016.08.007}},
  doi          = {{10.1016/j.memsci.2016.08.007}},
  volume       = {{520}},
  year         = {{2016}},
}