1. Structure and properties of clay ceramics for thermal energy storage
- Author
-
Claire E. White, Pierre-Marie Nigay, Winston O. Soboyejo, Ange Nzihou, Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement (RAPSODEE), Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Princeton University, and Worcester Polytechnic Institute
- Subjects
energy conversion ,Materials science ,CONVERSION ENERGIE ,Scanning electron microscope ,020209 energy ,02 engineering and technology ,Thermal energy storage ,7. Clean energy ,Heat capacity ,R-curve ,[SPI.MAT]Engineering Sciences [physics]/Materials ,Differential scanning calorimetry ,Flexural strength ,Biochar ,0202 electrical engineering, electronic engineering, information engineering ,Materials Chemistry ,phase transformations ,Ceramic ,Composite material ,Porosity ,TRANSFORMATION PHASE ,thermal properties ,PROPRIETE THERMIQUE ,021001 nanoscience & nanotechnology ,13. Climate action ,visual_art ,Ceramics and Composites ,visual_art.visual_art_medium ,fatigue ,0210 nano-technology - 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 transformed into 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 kJ/kg.K 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. 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. This article is protected by copyright. All rights reserved.
- Published
- 2017
- Full Text
- View/download PDF