优化纳米铸造技术,实现稳定的铋-多孔二氧化硅复合材料在热能储存中的应用

IF 8.6 2区 工程技术 Q1 ENERGY & FUELS Sustainable Materials and Technologies Pub Date : 2024-10-28 DOI:10.1016/j.susmat.2024.e01157
Daniel Lincu , Simona Ioniță , Mihaela Deaconu , Florica Papa , Bogdan Trică , Cristian Matei , Daniela Berger , Raul-Augustin Mitran
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引用次数: 0

摘要

以经济的方式储存太阳能以供整夜使用,是向绿色能源发电和应对全球变暖的广泛转型所面临的一项重大挑战。虽然大多数努力都集中在电化学电池上,但将太阳能储存为热能是一种可行的替代方法。相变材料(PCMs)利用固-液转变在恒温条件下可逆地储存热量。熔融相的泄漏限制了 PCM 的使用,但通过浸渍到多孔基质中可以缓解这一问题。金属可用于高温静态储热,但由于密度和表面张力相差很大,因此与氧化物基质不兼容。本报告介绍了通过纳米铸造和还原合成介孔二氧化硅-铋复合材料的优化方法。所得到的材料在介孔内部和作为粒子间相都显示出金属铋,从而使材料具有氧化稳定性、可逆蓄热性、形状稳定性和可靠性。在较短的反应时间(4 小时)和较低的温度(125 °C)下就能获得纳米约束铋相,而且这种铋相在空气中的氧化稳定性也有所提高。含有 50% 重量级金属的样品在金属熔点以上仍能保持宏观形状,不会发生泄漏。所有复合材料都保留了 50-96% 的理论熔融热,在 50 次加热-冷却循环后保持不变。在疏水性溶剂下对金属盐进行纳米铸造,是获得具有纳米约束金属相和颗粒间金属相的热能存储纳米复合材料的可行途径。
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Optimizing nanocasting techniques for stable bismuth-mesoporous silica composites in thermal energy storage application
Economically storing solar energy for use throughout the night is a major challenge facing the widespread transitions towards green energy generation and combating global warming. While most efforts are focused on electrochemical batteries, storing solar energy as heat is a viable alternative. Phase change materials (PCMs) utilize the solid – liquid transition to reversibly store heat at a constant temperature. The leakage of the molten phase limits the use of PCMs, but it can be alleviated by impregnation into porous matrices. Metals can be used for high temperature stationary heat storage, but are incompatible with oxide matrices due to the large difference in density and surface tension. The optimization of mesoporous silica – bismuth composites synthesis through nanocasting followed by reduction is reported. The resulting materials exhibit metallic bismuth both inside the mesopores and as an interparticle phase, leading to materials with stability towards oxidation, reversible heat storage, shape stability and reliability. A nanoconfined Bi phase could be obtained for low reaction times (4 h) and temperatures (125 °C) and it is correlated with increased stability towards oxidation in air. The samples with 50 % wt. metal retain their macroscopic shape above the metal melting point without leakage. All composites retain 50–96 % of their theoretical heat of fusion, which remains unchanged after 50 heating – cooling cycles. Nanocasting metal salts under hydrophobic solvents is a promising route for obtaining nanocomposites for thermal energy storage with both nanoconfined and interparticle metal phases.
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来源期刊
Sustainable Materials and Technologies
Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment
CiteScore
13.40
自引率
4.20%
发文量
158
审稿时长
45 days
期刊介绍: Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.
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