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Cyclic Voltammetry for Monitoring Corrosive Impurities in Molten Chlorides for Thermal Energy Storage

Ding, Wenjin and Bonk, Alexander and Gussone, Joachim and Bauer, Thomas (2017) Cyclic Voltammetry for Monitoring Corrosive Impurities in Molten Chlorides for Thermal Energy Storage. In: Energy Procedia, 135, pp. 82-91. Elsevier. 11th International Renewable Energy Storage Conference, IRES 2017, 14-16 March 2017, Düsseldorf, Germany. DOI: 10.1016/j.egypro.2017.09.489

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Official URL: https://doi.org/10.1016/j.egypro.2017.09.489

Abstract

Molten chlorides are promising alternative thermal energy storage (TES) materials to be applied in concentrating solar power (CSP) plants. Their high thermal stability makes them appropriate candidates to replace the commercial TES materials in CSP, nitrate salts (stable up to 550 °C), when higher operating temperatures (e.g., 700 °C) are required for higher efficiency of energy conversion. However, the application of molten chlorides at higher temperatures causes increased corrosiveness of containers and structural materials. In this work, cyclic voltammetry (CV) is applied to measure the concentration of corrosive oxide/hydroxide impurities in the molten chlorides in-situ, in order to assist the corrosion control. Before the electrochemical experiments, pre-electrolysis (PE) was performed on molten MgCl2/KCl/NaCl (60/20/20 mole%) salts to remove most of the impurities including oxide/hydroxide. By fitting the CV data from PE with those from the acid consumption (AC) measurements on the simultaneously collected salt samples, the parameter for the calculation of the concentration of MgOH+ from the peak current density was determined under the conditions 500 °C and sweep rate of 200 mV/s. By adding NaOH pellets into the molten salts, a significant change of a peak was observed in the cyclic voltammograms due to the concentration change of the most stable hydroxide species MgOH+. Moreover, when the determined parameter was used in the calculation of the concentrations of MgOH+ from the peak current densities, the calculated concentrations of MgOH+ compare well with those from AC.

Item URL in elib:https://elib.dlr.de/117743/
Document Type:Conference or Workshop Item (Poster)
Title:Cyclic Voltammetry for Monitoring 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:28 October 2017
Journal or Publication Title:Energy Procedia
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:135
DOI :10.1016/j.egypro.2017.09.489
Page Range:pp. 82-91
Publisher:Elsevier
Status:Published
Keywords:Corrosion; Concentrating solar power plant (CSP); Magnesium hydroxyl ion (MgOH+); In-situ concentration measurement.
Event Title:11th International Renewable Energy Storage Conference, IRES 2017
Event Location:Düsseldorf, Germany
Event Type:international Conference
Event Dates:14-16 March 2017
Organizer:EUROSOLAR
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:22 Dec 2017 11:22
Last Modified:31 Jul 2019 20:15

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