微尺度均匀细化CaO/Ca(OH) 2颗粒以提高热化学储能性能

IF 10.7 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Guangyao Zhao, Zhehui Zhao, Sixing Zhang, Jiakang Yao, Na Cheng, Zhen Li, Yu Han, Xiaotao Zhang
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引用次数: 0

摘要

基于Ca(OH) 2 /CaO脱水-水合反应的热化学储能技术因其储热密度高、周期长、安全等优点,被认为是解决可再生能源瞬态储能的一种有前途的策略。然而,这种技术存在一些缺点,比如在高温下结块和烧结,以及循环稳定性差。本研究采用C₃N₄掺杂Ca(OH)₂的方法优化颗粒的微观结构,在不降低储热密度的前提下,增强了热学性能,提高了转化率,改善了循环稳定性。深入表征表明,C₃N₄将Ca(OH)₂从片状结构转化为均匀的球形颗粒,尺寸约为10 μm。特别是当掺杂量达到30 wt%时,储热密度比纯Ca(OH) 2提高了11.10%,反应峰温度降低了13.98℃,转化率提高到91.22%。同时,该材料表现出优异的抗结块性能,在20次循环后保持776.46 J/g的储热密度,与未改性样品相比增加了27%。材料的微尺度效应得以保留。总之,这一成果展示了出色的综合性能,将热化学储能材料进一步应用于实际场景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microscale Homogeneous Refinement of CaO/Ca(OH)₂ Particles for enhancing Thermochemical Energy Storage Performance
Thermochemical energy storage technology based on the Ca(OH)₂/CaO dehydration-hydration reaction is considered as a promising strategy for addressing the transient storage of renewable energy due to high thermal storage density, long cycle characteristics, and safety. However, this technology suffers from drawbacks like agglomeration and sintering at high temperatures, along with poor cycling stability. In this study, the "dynamic" doping of Ca(OH)₂ with C₃N₄ was introduced to optimize the microstructure of particles, which enhanced the thermal performance, elevated conversion rate, and improved cycling stability, without reducing thermal storage density. In-depth characterizations revealed that C₃N₄ transformed Ca(OH)₂ from a flake-like structure to uniform spherical particles, approximately 10 μm in size. In particular, when the doping amount reached 30 wt%, the thermal storage density increased by 11.10% in contrast to Pure Ca(OH)₂, the peak reaction temperature decreased by 13.98°C, and the conversion rate improved to 91.22%. Simultaneously, the material exhibited excellent anti-caking properties, maintaining a thermal storage density of 776.46 J/g after 20 cycles, representing a 27% augmentation compared to the unmodified sample. The microscale effect of the material was retained. In summary, this outcome showcases outstanding comprehensive properties, taking thermochemical energy storage materials further into practical scenarios.
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来源期刊
Journal of Materials Chemistry A
Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
19.50
自引率
5.00%
发文量
1892
审稿时长
1.5 months
期刊介绍: The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.
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