改性三水醋酸钠的储能特性及温差发电研究  

Study on energy storage characteristics and thermoelectric generation of modified sodium acetatetrihydrate

作　　者：陈启阳 盛鑫鑫 徐政凯 陈颖 CHEN Qiyang;SHENG Xinxin;XU Zhengkai;CHEN Ying(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学材料与能源学院,广州510006

出　　处：《功能材料》2023年第6期6134-6140,共7页Journal of Functional Materials

基　　金：国家自然科学基金(No.U20A20299)。

摘　　要：三水醋酸钠(sodium acetate trihydrate,SAT)是一种可用太阳能光热转换和热能储热的固液相变材料。然而其过冷度的存在导致储存的潜热无法及时释放利用。采用十二水磷酸氢二钠(disodium hydrogen phosphate dodecahydrate,DSP)作为分子成核剂,当DSP的添加量为3%时,SAT的过冷度被降低至0.4℃,对应的相变焓值和热导率分别为226.08 J/g和0.63 W/(m·K)。将高太阳能吸收率的碳纳米管(carbon nanotubes,CNTs)与SAT/DSP蓄热单元结合后得到了具有太阳能光热转换和热能储存SAT/DSP/CNTs的装置,实现了太阳能温差发电。研究为三水醋酸钠在太阳能利用方面提供了一种可行和有效的方法。Sodium acetate trihydrate(SAT)is a solid liquid phase change material that can be used for solar energy photothermal conversion and thermal energy storage.However,the existence of its supercooling leads to the inability to release and utilize the stored latent heat in time.In this work,disodium hydrogen phosphate dodecahydrate(DSP)was used as the molecular nucleating agent.When the amount of DSP was 3%,the supercooling of SAT was reduced to 0.4℃.The corresponding phase transition enthalpy and thermal conductivity are 226.08 J/g and 0.63 W/(m·K),respectively.The combination of carbon nanotubes(CNTs)with high solar absorptance and SAT/DSP heat storage unit leads to a device with solar energy photothermal conversion and thermal energy storage SAT/DSP/CNTs,which realizes solar energy thermoelectric generation.This study provides a feasible and effective method for the utilization of solar energy by sodium acetate trihydrate.

关 键 词：三水醋酸钠 十二水磷酸氢二钠 光热转换 温差发电 过冷度 

分 类 号：TB34[一般工业技术—材料科学与工程]