基于HCS+MM聚合物纳米限域高活性抗氧化纳米镁基储氢材料的研究

根据课题组前期氢化燃烧合成与高能机械球磨(HCS+MM)制备高活性高容量镁基储氢材料的存在问题：HCS+MM产物，虽在373K，100秒内吸氢高达6.4wt.%，但只能维持几个循环；虽放氢初始温度降低150K，但100%放氢仍需523K；本项目提出基于HCS+MM聚合物纳米限域高活性抗氧化纳米镁基储氢材料的研究新思路：构建聚合物纳米限域结构，增强HCS+MM产物纳米颗粒抗再结晶能力，提高吸放氢循环寿命；利用透氢抗氧聚合物膜包覆，提高HCS+MM产物高活性纳米颗粒抗氧化能力，保持低温吸氢动力学特性；以聚合物为MM过程控制纳米分散助剂，强化MM纳米化效率，进一步改善镁基储氢材料热力学稳定性。本项目将在聚合物改性、制备工艺探索、微观结构表征、储氢性能改善和储氢机理阐明等方面开展深入系统的研究，取得创新性成果；对于推动具有我国自主知识产权新型高性能镁基储氢材料的研发，具有重要的理论意义和实用价值。

Basing on our previous researches on Mg-based hydrogen storage materials holding high activity and high capacity prepared by the process of hydriding combustion synthesis (HCS) followed by mechanical milling (MM) and focusing on the remained problems of several cycles of hydrogen absorption only even capacity of 6.44 wt.% at 373 K and 523 K for 100% hydrogen desorption still even 150 K of on-set temperature decreased already, this project proposes a new research idea of Nano Mg-based hydrogen storage materials with high activity and antioxidation nano-confined by polymer based on the process of Hydriding Combustion Synthesis and Mechanical Milling: that is, selecting polymer as the nano-dispersion and milling controller in MM process, to enhance the nano-structure effect and to improve the thermodynamic stability further; using encapsulation with hydrogen permeable oxygen nonpermeable polymer membrane, to resist the oxidation on the high active nano-particle surface and to retain the kinetic property of hydrogen absorption at low temperature; relying on the nano-confined mechanism of membrane encapsulation, to reinforce the anti-recrystallization ability of nano-particle and to increase the cycle stability of hydrogen storage. This project will research deeply on the alteration of hydrogen permeable oxygen nonpermeable polymer, the optimization of preparation process, the characterization of microstructure, the improvement of hydrogen storage property and the explanation of hydrogen storage mechanism. The innovative results achieved by this project will have significant academic value and well prospective application for the development of high performance Mg-based hydrogen storage materials with independent knowledge property of China.