Synthesis of novel shape-stabilized phase change materials with high latent heat and low supercooling degree for thermal
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Synthesis of novel shape-stabilized phase change materials with high latent heat and low supercooling degree for thermal energy storage Yu Li1, Liang Zhao1, Hao Wang1, Baohua Li2,a) 1
Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; and Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China 2 Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; and Engineering Laboratory for Functionalized Carbon Materials and Shenzhen Key Laboratory for Graphene-based Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China a) Address all correspondence to this author. e-mail: [email protected] Received: 10 January 2019; accepted: 28 February 2019
In this work, a novel shape-stabilized phase change material, composed of n-octadecane, expanded graphite (EG), and sodium chloride (NaCl), was prepared by a convenient method. In the composite, EG was used as the matrix material and NaCl served as the nucleating agent. Effects of the additional amount of NaCl on the thermal properties of the composite were investigated by DSC and TG. The melting and crystallization enthalpies of the composite are −160.23 J/g and 162.80 J/g, respectively; the supercooling degree of the composite decreased to 3.77 °C when compared to 7.58 °C of the pure n-octadecane. Furthermore, the thermal cycling performances became better, and the thermal decomposition temperature improved to 150 °C. The composite exhibited high latent heat, low supercooling degree, good thermal cycling performance, and enhanced thermal stability, making it a potential material for the thermal energy storage application in the field of thermal regulation.
Introduction Thermal energy storage is an important branch of energy science and technology. In the process of energy conversion and utilization, sometimes there is no match between demand and supply in time and space, such as peak and valley difference of electric load, intermittent availability of solar, wind, and ocean energy, and discontinuous operation of industrial furnace [1, 2]. Energy storage technology is an effective way to deal with the above problems and energy efficiency will be improved accordingly [3, 4]. Thermal energy storage, including sensible heat storage and latent heat storage, is one of the most important means among the energy storage technologies [5]. Phase change materials (PCMs) can store/release thermal energy through solid–liquid phase changes in a certain temperature range [6]. The stored or released thermal energy is called latent heat of phase change [7]. With the change in the physical state between solid and liquid, the temperature of
ª Materials Research Society 2019
PCMs itself almost remained unchanged before the transformation completed, and therefore a broad temperature platform could be formed along with a large amount
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