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Electrochemical measurement of corrosive impurities in molten chlorides for thermal energy storage

Ding, Wenjin and Bonk, Alexander and Gussone, Joachim and Bauer, Thomas (2018) Electrochemical measurement of corrosive impurities in molten chlorides for thermal energy storage. Journal of Energy Storage, 15, pp. 408-414. Elsevier. DOI: 10.1016/j.est.2017.12.007 ISSN 2352-152X

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Official URL: https://www.sciencedirect.com/science/article/pii/S2352152X17302864

Abstract

Molten chlorides are promising alternative thermal energy storage (TES) materials to be applied in concentrated solar power (CSP) plants owing to their higher thermal stability (stable at >800 °C) than the commercial TES materials – nitrate salt mixtures (decomposed at ∼550 °C). Higher operating temperatures of TES can increase efficiencies of thermal into electrical energy conversion for CSP power plants, but cause additional challenges, particularly increase corrosiveness of metal containers and structural materials. Corrosion rates significantly depend on concentration of corrosive hydroxide impurity in the molten chlorides. This paper presents an electrochemical method based on cyclic voltammetry (CV) to in-situ measure the concentration of the hydroxide impurity in molten MgCl2/KCl/NaCl (60/20/20 mol%) salts at 500–700 °C. Before each CV experiment, the concentration of the hydroxide impurity in the molten salts was measured via acid consumption (AC) measurements on the simultaneously collected salt sample. The results of CV and AC experiments show that the peak current densities obtained from CV are proportional to the concentrations of the hydroxide impurity obtained from AC in the studied system. The slopes of peak current densities vs. concentrations of the hydroxide impurity are determined, which compare well with literature data. This electrochemical method for monitoring the corrosive hydroxide impurity is expected to assist the corrosion control on containers and structural materials in the molten chlorides.

Item URL in elib:https://elib.dlr.de/118785/
Document Type:Article
Title:Electrochemical measurement of corrosive impurities in molten chlorides for thermal energy storage
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ding, WenjinWenjin.Ding (at) dlr.deUNSPECIFIED
Bonk, AlexanderAlexander.Bonk (at) dlr.deUNSPECIFIED
Gussone, JoachimJoachim.Gussone (at) dlr.deUNSPECIFIED
Bauer, Thomasthomas.bauer (at) dlr.deUNSPECIFIED
Date:6 February 2018
Journal or Publication Title:Journal of Energy Storage
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:15
DOI :10.1016/j.est.2017.12.007
Page Range:pp. 408-414
Publisher:Elsevier
ISSN:2352-152X
Status:Published
Keywords:Corrosion control, Cyclic voltammetry (CV), Concentrated solar power (CSP), Magnesium hydroxyl ion (MgOH+)
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Ding, Wenjin
Deposited On:07 Sep 2018 12:53
Last Modified:19 Dec 2018 05:02

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