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/ | |||||||||||||||
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Document Type: | Conference or Workshop Item (Poster) | |||||||||||||||
Title: | Cyclic Voltammetry for Monitoring Corrosive Impurities in Molten Chlorides for Thermal Energy Storage | |||||||||||||||
Authors: |
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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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