{"title":"NaF-NaCl/graphite foam composites for high-temperature latent heat storage applications","authors":"Chongyang Wei, Chen Xu, Yi Li, Zhongfeng Tang","doi":"10.1016/j.cej.2025.161556","DOIUrl":null,"url":null,"abstract":"Fluorine and chlorine reciprocal salts are ideal media for high-temperature latent heat storage because of their high latent heat, wide sources and good chemical stability. However, low thermal conductivity, corrosion and leakage of molten salts limit its further development and application. In order to solve these problems, three kinds of high thermal conductivity graphite foams (GFs) with different pore structures were selected and combined with NaF-NaCl eutectic salts by vacuum impregnation to successfully prepare NaF-NaCl/GF composites with high thermal conductivity and high energy density. The designed composites have high thermal conductivity ranging from 31.3 W/m·K to 108.9 W/m·K, benefiting from the continuous heat transfer channels of the GF porous skeleton. The higher volume filling ratio (94.7–98.5 %) allows the composites to have high latent heat (331.8–556.6 J/g). In addition, the thermophysical properties of the composites remained stable after 50 thermal cycles. The results show that NaF-NaCl/GF composites have a potential application in high temperature heat storage.","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":"24 1","pages":""},"PeriodicalIF":13.3000,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Engineering Journal","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.cej.2025.161556","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Fluorine and chlorine reciprocal salts are ideal media for high-temperature latent heat storage because of their high latent heat, wide sources and good chemical stability. However, low thermal conductivity, corrosion and leakage of molten salts limit its further development and application. In order to solve these problems, three kinds of high thermal conductivity graphite foams (GFs) with different pore structures were selected and combined with NaF-NaCl eutectic salts by vacuum impregnation to successfully prepare NaF-NaCl/GF composites with high thermal conductivity and high energy density. The designed composites have high thermal conductivity ranging from 31.3 W/m·K to 108.9 W/m·K, benefiting from the continuous heat transfer channels of the GF porous skeleton. The higher volume filling ratio (94.7–98.5 %) allows the composites to have high latent heat (331.8–556.6 J/g). In addition, the thermophysical properties of the composites remained stable after 50 thermal cycles. The results show that NaF-NaCl/GF composites have a potential application in high temperature heat storage.
期刊介绍:
The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.