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Structure and properties of clay ceramics for thermal energy storage

Abstract : In this paper, the structure-property relationships of a clay ceramic with organic additives (biomass and biochar) are investigated to develop an alternative material for thermal energy storage. The firing transformations were elucidated using X-ray pair distribution function analysis, differential scanning calorimetry, and scanning electron microscopy. It was found that the biomass increased the porosity, which resulted in a decrease of the specific heat capacity. On the other hand, the biochar remained in the clay ceramic without any interaction with the clay matrix up to 950°C. The specific heat capacity of the clay ceramic increased from 1.20 to 1.49 kJ/kg·K for a 30 wt% addition of biochar. The clay ceramic with a 30 wt% addition of biochar also conserved a high flexural strength of 11.1 MPa compared to that of the clay ceramic without organic additives (i.e., 18.9 MPa). Furthermore, the flexural strength only decreased by 23% after 100 thermal cycles. The crack growth associated with the thermal fatigue was limited by crack bridging and crack trapping. Hence, the current results suggest that clay/biochar ceramics can be as efficient as molten salts in thermal energy storage with the added benefit of an ease of use in the physical form of bricks.
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Submitted on : Wednesday, January 16, 2019 - 6:59:06 PM
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Pierre-Marie Nigay, Ange Nzihou, Claire E. White, Winston O. Soboyejo. Structure and properties of clay ceramics for thermal energy storage. Journal of the American Ceramic Society, 2017, 100 (10), pp.4748-4759. ⟨10.1111/jace.15014⟩. ⟨hal-01630902⟩



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