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Structural Characterisation and Chemical Stability of Commercial Fibrous Carbons in Molten Lithium Salts

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Institut Jean Lamour, Université de Lorraine, CNRS, IJL, F-88000 Epinal, France
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Institut Jean Lamour, Université de Lorraine, CNRS, IJL, F-54000 Nancy, France
*
Author to whom correspondence should be addressed.
Materials 2019, 12(24), 4232; https://doi.org/10.3390/ma12244232
Received: 19 November 2019 / Revised: 23 November 2019 / Accepted: 13 December 2019 / Published: 17 December 2019
The growing trend towards sustainable energy production, while intermittent, can meet all the criteria of energy demand through the use and development of high-performance thermal energy storage (TES). In this context, high-temperature hybrid TES systems, based upon the combination of fibrous carbon hosts and peritectic phase change materials (PCMs), are seen as promising solutions. One of the main conditions for the operational viability of hybrid TES is the chemical inertness between the components of the system. Thus, the chemical stability and compatibility of several commercial carbon felts (CFs) and molten lithium salts are discussed in the present study. Commercial CFs were characterised by elemental analysis, X-ray diffraction (XRD) and Raman spectroscopy before being tested in molten lithium salts: LiOH, LiBr, and the LiOH/LiBr peritectic mixture defined as our PCM of interest. The chemical stability was evaluated by gravimetry, gas adsorption and scanning electron microscopy (SEM). Among the studied CFs, the materials with the highest carbon purity and the most graphitic structure showed improved stability in contact with molten lithium salts, even under the most severe test conditions (750 °C). The application of the Arrhenius law allowed calculating the activation energy (in the range of 116 to 165 kJ mol−1), and estimating the potential stability of CFs at actual application temperatures. These results confirmed the applicability of CFs as porous hosts for stabilising peritectic PCMs based on molten lithium salts. View Full-Text
Keywords: carbon fibres; carbon felts; characterisation; chemical stability; high-temperature; lithium salts; peritectic compounds; thermal energy storage carbon fibres; carbon felts; characterisation; chemical stability; high-temperature; lithium salts; peritectic compounds; thermal energy storage
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Karakashov, B.; Fierro, V.; Mathieu, S.; Gadonneix, P.; Medjahdi, G.; Celzard, A. Structural Characterisation and Chemical Stability of Commercial Fibrous Carbons in Molten Lithium Salts. Materials 2019, 12, 4232.

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