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金属硼氢化物基储氢材料原位纳米约束设计及其吸放氢反应机理

批准号51701092 学科分类金属能源和环境材料 ( E010504 )
项目负责人顾坚 负责人职称副研究员 依托单位南京大学
资助金额20.00
万元
项目类别青年科学基金项目 研究期限2018 年 01 月 01 日 至
2020 年 12 月 31 日
中文主题词配位氢化物;可逆储氢;储氢机理
英文主题词complex hydrides;reversible hydrogen storage;hydrogen storage mechanism

摘要

中文摘要 开发高能量密度、高效率和安全的氢气存储技术是氢能大规模应用的关键。金属硼氢化物具有高的储氢密度,被认为是最有潜力的固态储氢材料之一。然而,目前金属硼氢化物储氢材料仍面临吸放氢温度高和可逆性差两大问题,无法满足实用化要求。本项目基于传统纳米限域储氢改性的思路,拟利用反溶剂沉淀法和核壳结构制备技术,获得具备原位纳米约束和原位催化能力的储氢材料,并通过壳体成分、结构、核壳比的调制,实现对金属硼氢化物储氢材料吸放氢热力学和动力学的调控,进一步降低其吸放氢温度、改善可逆性和提高纳米结构的稳定性,并获得高实际储氢容量的储氢体系。通过对比研究制得储氢材料的吸放氢热力学、动力学性能和结构、形貌、成分变化,初步阐明其储氢机理。
英文摘要 The development of hydrogen storage technique with high energy density, efficiency and safety is crucial to the widespread application of hydrogen energy. Metal borohydrides, with high hydrogen capacity, are considered as one of the most promising solid hydrogen storage materials. However, faced with high desorption/absorption temperature and low reversibility, metal borohydrides still cannot satisfy the pratical requirements at present. In this project, based on the idea of the traditional nanoconfinement, the methods of antisolvent precipitation and Core-Shell structure preparation are introduced to obtain the target materials possessing the ability of both nano-constraint and catalysis in situ. By modifying the Core/Shell ratio, constituent and structure of the shell, it is realized to tailor the hydrogen desorption/absorption thermodynamics and kinetics, subsequently achieving the lowered desorption/absorption temperature, improved reversibility, enhanced stability of the prepared nano-structure and the high actual hydrogen capacity. Further, the hydrogen storage mechanism will be preliminarily clarified by comparative study on the hydrogen desorption/absorption thermodynamics, kinetics and variations of their structure, morphology and composition.
结题摘要

成果

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