Investigation on synthesis of Y2O3/ZrO2 co-stabilized Cu/Ca composites and their thermochemical energy storage properties

doi:10.19799/j.cnki.2095-4239.2024.0931

Abstract

Abstract:

Cu/Ca-based thermochemical energy storage presents a novel hydrogen storage method that effectively addresses excess power consumption. However, the effectiveness of Cu/Ca composites in carbonation decreases significantly after multiple cycles, limiting their practical use. To address this issue, we employed a stabilizer modification method to improve the performance of Cu/Ca composites. First, Cu/Ca composites were prepared using the Pechini method and stabilized with different stabilizers, then evaluated in a triple-packed-bed reactor. Experimental results showed that composites modified with stabilizers maintained excellent oxidation properties over 10 cycles, with oxidation conversions consistently above 90%. Among the stabilizers tested, Y₂O₃ significantly improved the carbonation conversion of the composites compared to CeO₂ and MgO. Specifically, the 5Y-Cu-Ca composite, with a Y₂O₃/CaO/CuO molar ratio of 5∶47.5∶47.5, displayed an initial carbonation conversion of 74.6%, which decreased to 54.1% after 10 cycles. To further improve the carbonation performance of Y₂O₃-stabilized Cu/Ca composites, we adopted a dual-stabilization strategy by incorporating ZrO₂ as a second carrier and co-doping it with Y₂O₃. The most effective Y₂O₃/ZrO₂-stabilized Cu/Ca composites, with a molar ratio of 2∶1, achieved an initial carbonation conversion of 81.6%, dropping to 70.5% after 10 cycles, retaining 86% of its initial activity. In summary, the Cu/Ca composites developed in this study hold great potential for the practical application of Cu/Ca-based thermochemical energy storage technology.

Key words: energy storage, chemical reaction, chemical looping, stabilizer

CLC Number:

TK 91

Hedan TANG, Han YE, Youjin ZHANG, Rui SHEN, Wenzhong LU, Jian CHEN, Youshi LI, Mingdi LI. Investigation on synthesis of Y₂O₃/ZrO₂ co-stabilized Cu/Ca composites and their thermochemical energy storage properties[J]. Energy Storage Science and Technology, 2024, 13(12): 4310-4318.

Figures/Tables 8

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Investigation on synthesis of Y₂O₃/ZrO₂ co-stabilized Cu/Ca composites and their thermochemical energy storage properties

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