纳米多孔碳孔径对SrBr_(2)化学蓄放热性能的影响  

Pore Size Effect of Nanoporous Carbon Powder on Thermochemical Heat Storage Performances of SrBr_(2)

作　　者：吴佳涛 曾涛 李军[1,2] 邓立生[1,2] 黄宏宇 WU Jiatao;ZENG Tao;LI Jun;DENG Lisheng;HUANG Hongyu(School of Energy Science and Engineering,University of Science and Technology of China,Guangzhou 510640,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China)

机构地区：[1]中国科学技术大学能源科学与技术学院,广州510640 [2]中国科学院广州能源研究所,广州510640

出　　处：《新能源进展》2024年第3期269-275,共7页Advances in New and Renewable Energy

基　　金：国家自然科学基金项目(52176091)。

摘　　要：溴化锶(SrBr_(2))被认为是化学蓄热领域最有前景的材料之一。为探究载体孔径大小对SrBr_(2)蓄放热性能的影响,分别以孔径为10、30、50和100 nm的纳米多孔碳(NCP)为载体,采用浸渍法制备多孔碳基SrBr_(2)复合材料。通过XRD、SEM和BET对复合材料的微观形貌结构进行表征,并通过水合实验和同步热分析对其蓄放热性能进行测试。结果表明,复合材料的吸水量和蓄热密度随孔径先增大后减小,存在最优载体孔径。其中,NCP50-SrBr_(2)具有最优的平衡吸水量和蓄热密度,分别为0.703 g/g和1198.62 kJ/kg。NCP50-SrBr_(2)表现出更快的反应速率,在水合反应30min后蓄热密度可达945.34kJ/kg。研究结果可为纳米尺度定向调控化学蓄热材料性能提供理论依据。Strontium bromide(SrBr_(2))is one of the most promising storage materials for thermochemical energy storage.To investigate the effect of pore size on thermochemical characterizations of strontium bromide(SrBr_(2)),composites were prepared by the impregnation method loading SrBr_(2) on nanoporous carbon powder(NCP)with pore sizes of 10,30,50,and 100 nm.The microstructure of the composites was characterized by XRD,SEM and BET,and their heat storage and release performances were tested by hydration experiments and simultaneous thermal analysis.The experimental results showed that the hydration capacity and heat storage density of the composites increased and then decreased with the pore size,and there was an optimal carrier pore size.The NCP50-SrBr_(2) composite had an optimal equilibrium hydration capacity and heat storage density of 0.703 g/g and 1198.62 kJ/kg,respectively.Moreover,the thermochemical heat storage performance of the NCP50-SrBr_(2) composite was the best at 30 min,reaching 945.34 kJ/kg,indicating that the NCP50-SrBr_(2) composite had a faster reaction rate.This study can provide a theoretical basis for the nanoscale directional control of chemical heat storage material properties.

关 键 词：化学蓄热 孔径 溴化锶 纳米多孔碳 蓄放热性能 

分 类 号：TK11[动力工程及工程热物理—热能工程]