无机材料学报 ›› 2023, Vol. 38 ›› Issue (7): 793-799.DOI: 10.15541/jim20220658 CSTR: 32189.14.10.15541/jim20220658

• 研究论文 • 上一篇    下一篇

离子热合成锰基氧化物及其可逆储热性能

孟波1(), 肖刚2, 王秀丽1, 涂江平1, 谷长栋1()   

  1. 1.浙江大学 材料科学与工程学院, 杭州310058
    2.浙江大学 能源清洁利用国家重点实验室, 杭州 310027
  • 收稿日期:2022-11-07 修回日期:2022-12-04 出版日期:2022-12-16 网络出版日期:2022-12-27
  • 通讯作者: 谷长栋, 副教授. E-mail: cdgu@zju.edu.cn
  • 作者简介:孟 波(1998-), 女, 硕士研究生. E-mail: 22060231@zju.edu.cn
  • 基金资助:
    国家自然科学基金(52176207)

Ionic Thermal Synthesis and Reversible Heat Storage Performance of Manganese-based Oxides

MENG Bo1(), XIAO Gang2, WANG Xiuli1, TU Jiangping1, GU Changdong1()   

  1. 1. College of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China
    2. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
  • Received:2022-11-07 Revised:2022-12-04 Published:2022-12-16 Online:2022-12-27
  • Contact: GU Changdong, associate professor. E-mail: cdgu@zju.edu.cn
  • About author:MENG Bo (1998-), female, Master candidate. E-mail: 22060231@zju.edu.cn
  • Supported by:
    National Natural Science Foundation of China(52176207)

摘要:

光热电站需要配备大规模高温储热模块, 金属氧化物可以通过可逆氧化还原反应实现热量的存储与释放。其中锰基氧化物无毒、廉价, 极具潜力, 但可逆性较差。为此, 本研究采用深共溶溶剂离子热合成了锰基氧化物, 探索了合成参数和铁掺杂对其储热性能的影响。离子热合成的MnCO3前驱体在高温下分解释放CO2, 使锰基氧化物具有丰富的孔隙结构, 为氧气的传输与扩散提供通道, 有利于氧化还原反应。离子热合成的Mn2O3比商业Mn2O3反应性能好, 但其氧化反应速度较慢; 合成温度150 ℃、掺杂20% Fe的锰铁氧化物的氧化速率快, 储热密度高达300.66 J/g, 反应可逆性最佳, 可实现长期稳定循环。离子热合成策略可以增加锰氧化物中晶格氧占比, 促进氧空位的迁移, 从而提高可逆性和循环稳定性。

关键词: 光热发电, 储热, 锰基氧化物, 深共溶溶剂

Abstract:

Concentrated solar power plant needs to be equipped with large-scale high-temperature heat storage module. Metal oxides can store and release heat through reversible redox reaction. Manganese oxides is non-toxic and cheap, showing great potential for applying in solar power plant, but it displays poor reversibility. Here, a manganese-based oxides with high reversibility by deep eutectic solvent (DES) ionic thermal synthesis was proposed, and effects of synthesis parameters and iron doping on heat storage performance were studied. MnCO3, as the raw material, was used to produce manganese oxides by ionic thermal decomposition at high temperature and released CO2, which could also form abundant pore structure, providing great channels for oxygen transmission and diffusionfor redox. Although this Mn2O3 synthesis method showed better reactivity than commercial Mn2O3, its oxidation rate was low. It is worth noting that oxidation rate of manganese iron oxide doped with 20% Fe, synthesized at 150 ℃, was fast. Its heat storage density reached 300.66 J/g, and reversibility of the reaction was the best, which could realize long-term stable cycle. Our results demonstrated that ionic thermal synthesis can increase the lattice oxygen ratio in manganese oxides, promoting migration of oxygen vacancies, and further improving reversibility and cyclic stability.

Key words: concentrated solar power, heat storage, manganese-based oxide, deep eutectic solvent

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