Investigation on support modification on thermochemical energy storage characteristics of Ca/Cu composites

doi:10.19799/j.cnki.2095-4239.2024.0940

Abstract

Abstract:

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.

Key words: thermochemical energy storage, support, chemical looping, composite

CLC Number:

TK 91

Mengru WANG, Xirui SUN, Haoyu ZHANG, Jian CHEN, Youshi LI. Investigation on support modification on thermochemical energy storage characteristics of Ca/Cu composites[J]. Energy Storage Science and Technology, 2024, 13(12): 4290-4298.

Figures/Tables 8

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