Investigation on support modification on thermochemical energy storage characteristics of Ca/Cu composites
The combined Ca/Cu thermochemical energy storage process provides an efficient method for storing and releasing hydrogen through simple gas-solid reactions,demonstrating strong industrial potential.Despite its broad application prospects,the carbonation performance of Ca/Cu composites tends to decay over extended cycling.To address this issue,we investigated the effect of support modification on the thermochemical energy storage characteristics of Ca/Cu composites.Experimental results indicated that Ca/Cu composites modified with ZrO2 using the Pechini method outperformed those prepared via solution combustion synthesis,co-precipitation,and wet mixing.These ZrO2-modified composites achieved a carbonation conversion of 67.4％in the first cycle,which only slightly dropped to 64.4％after 10 cycles,retaining 96％of their original efficiency.Adding CeO2,MgO,or ZnO as secondary support to ZrO2-modified Ca/Cu composites significantly enhanced the carbonation performance.Notably,Ca/Cu composites co-modified with ZrO2 and MgO demonstrated the highest performance.With 5％of ZrO2 and MgO,these composites maintained an average carbonation conversion rate of 74.9％over 10 cycles,which is 15.4％higher than composites modified with ZrO2.In conclusion,the Ca/Cu composites synthesized in this study are highly significant for the practical application of the combined Ca/Cu thermochemical energy storage process.
thermochemical energy storagesupportchemical loopingcomposite
万方数据
维普
