To identify potential low-temperature thermochemical heat storage (TCHS) materials, hydration/dehydration reactions of M(SO) (M = Sc, Yb, Y, Dy, Al, Ga, Fe, In) are investigated by thermogravimetry (TG). These materials have the same rhombohedral crystal structure, and one of them, rhombohedral Y(SO), has been recently proposed as a promising material. All M(SO)·HO hydrate/dehydrate reversibly between 30 and 200 °C at a relatively low (=0.02 atm). Among them, rare-earth (RE) sulfates RE(SO)·HO (RE = Sc, Yb, Y, Dy) show narrower thermal hystereses (less than 50 °C), indicating that they have faster reaction rates than the other sulfates M(SO)·HO (M = Al, Ga, Fe, In). As for the heat storage density, Y(SO)·HO is most promising due to the largest mass change (>10 mass % anhydrous basis) during the reactions. This is larger than that of the existing candidate CaSO·0.5HO (6.6 mass % anhydrous basis). Regarding the reaction temperature of the water insertion into rhombohedral RE(SO) (RE = Yb, Y, Dy) to form RE(SO)·HO, it increases as the ionic radius of RE becomes larger. Since such a relationship is also observed in β-RE(SO)·HO, RE(OH) and REPO·HO, this empirical knowledge should be useful to expect the dehydration/hydration reaction temperatures of the RE compounds.
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| http://dx.doi.org/10.1021/acsomega.9b04308 | DOI Listing |
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