Hierarchically porous CMC/rGo/CNFs aerogels for leakage-proof mirabilite phase change materials with superior energy thermal storage  

作　　者：Fenglan CHEN Xin LIU Zhengya WANG Shengnian TIE Chang-An WANG 

机构地区：[1]New Energy Photovoltaic Industry Research Center,Qinghai University,Xining 810016,China [2]School of Chemical Engineering,Qinghai University,Xining 810016,China [3]State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Frontiers of Materials Science》2022年第4期49-61,共13页材料学前沿（英文版）

基　　金：the financial supports from the Natural Science Foundation of Qinghai Province(Grant Nos.2020-ZJ-909 and 2021-ZJ-906);the Qinghai Thousand Talents Program(Grant No.724112);the Opening Project of State Key Laboratory of the New Technologies for Material Composites,Wuhan University of Technology(Grant No.2020-KF-1).

摘　　要：As a kind of essential hydrated salt phase change energy storage materials,mirabilite with high energy storage density and mild phase-transition temperature has excellent application potential in the problems of solar time and space mismatch.However,there are some disadvantages such as supercooling,substantial phase stratification and leakage problem,limiting its further applications.In this work,for the preparation of shaped mirabilite phase change materials(MPcMs),graphene(GO),sodium carboxymethyl cellulose(CMC),and carbon nanofibers(CNFs)were used as starting materials to prepare lightweight CMC/rGO/CNFs carbon aerogel(CGCA)as support with stable shape,high specific surface area,and well-arranged hierarchically porous structure.The results show that CGCA has regular layered plentiful pores and stable foam structure,and the pore and sheet interspersed structure in CGCA stabilizes PcMs via capillary force and surface tension.The hydrophilic aerogels supported MPCMs decrease mirabilite leaking and reduce supercooling to around 0.7-1C.The latent heats of melting and crystallization of CGCA-supported mirabilite phase change materials(CGCA-PCMs)are 157.1 and 114.8 J-g-1,respectively.Furthermore,after 1500 solid-liquid cycles,there is no leakage,and the retention rate of crystallization latent heat is 45.32%,exhibiting remarkable thermal cycling stability.

关 键 词：carbon aerogel MIRABILITE phase change material SUPERCOOLING thermal cycling stability 

分 类 号：TB34[一般工业技术—材料科学与工程] TQ427.2[化学工程]