Preparation of dark Fe/Mn/Zr-doped CaO-based heat carriers for solar-driven thermochemical energy storage

IF 6.6 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells Pub Date : 2025-06-15 Epub Date: 2025-02-21 DOI:10.1016/j.solmat.2025.113532

Qiannian Feng , Yuan Wei , Ruicheng Fu , Yingchao Hu

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Abstract

Thermochemical energy storage technology exhibits great potential due to its high efficiency, low-cost and widespread availability. Efficient solar energy storage necessitates both a high energy storage performance and optimal direct solar absorption for enhanced performance. However, the density decay due to sintering and weak solar absorption because of light color of CaO-based heat carriers significantly restrict the application of CaL-based energy storage technology. This study aims to synthesize CaO-based heat carriers possessing both high energy storage density and strong solar absorption. Fe/Mn ions and Zr-based supports were individually and simultaneously doped to enhance the cyclic energy storage performance of CaCO₃/CaO materials more effectively. The Fe/Mn/Zr triple-doped material (Ca100Fe12Mn6Zr10) exhibited a substantial enhancement in average spectral absorption (reaching 51.42 %), an increase of nearly 5.5 times compared to pure CaO (9.33 %). This enhancement was attributed to the formation of dark Ca₂Fe₂O₅, Ca₂MnO₄, and Ca₄Mn₃O₁₀ compounds. Additionally, the formation of CaZrO₃, Ca₂MnO₄, and Ca₄Mn₃O₁₀, characterized by notable sintering resistance, served as a thermal stabilizer to enhance the cyclic stability. Consequently, the triple-doped CaO-based heat carrier achieved a high density of 1549.04 kJ/kg in the 10th cycle, retaining 97.24 % of its initial value.

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暗Fe/Mn/ zr掺杂cao基热载体的制备及其在太阳能热化学储能中的应用

热化学储能技术因其高效、低成本和广泛可用性而显示出巨大的潜力。高效的太阳能存储需要高储能性能和最佳的太阳能直接吸收来增强性能。然而，钙基热载体由于烧结造成的密度衰减和颜色较浅导致的太阳吸收较弱，极大地限制了钙基储能技术的应用。本研究旨在合成具有高储能密度和强太阳能吸收率的cao基热载体。分别掺杂Fe/Mn离子和zr基载体，可以更有效地提高CaCO3/CaO材料的循环储能性能。Fe/Mn/Zr三掺杂材料（Ca100Fe12Mn6Zr10）的平均光谱吸收显著增强（达到51.42%），比纯CaO（9.33%）提高了近5.5倍。这种增强归因于深色Ca2Fe2O5， Ca2MnO4和Ca4Mn3O10化合物的形成。此外，形成的CaZrO3、Ca2MnO4和Ca4Mn3O10具有显著的抗烧结性，可作为热稳定剂提高循环稳定性。因此，三掺杂的cao基热载体在第10次循环中获得了1549.04 kJ/kg的高密度，保持了其初始值的97.24%。

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来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.