Pore Size Effect of Nanoporous Carbon Powder on Thermochemical Heat Storage Performances of SrBr2
Strontium bromide(SrBr2)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(SrBr2),composites were prepared by the impregnation method loading SrBr2 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-SrBr2 composite had an optimal equilibrium hydration capacity and heat storage density of 0.703 g/g and 1 198.62 kJ/kg,respectively.Moreover,the thermochemical heat storage performance of the NCP50-SrBr2 composite was the best at 30 min,reaching 945.34 kJ/kg,indicating that the NCP50-SrBr2 composite had a faster reaction rate.This study can provide a theoretical basis for the nanoscale directional control of chemical heat storage material properties.
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