El-Eskandarany M Sherif, Al-Salem Sultan Majed, Ali Naser, Banyan Mohammad, Al-Ajmi Fahad, Al-Duweesh Ahmed
Kuwait Institute for Scientific Research, 13109, Kuwait City, Kuwait.
Energy and Building Research Center, Kuwait City, Kuwait.
Sci Rep. 2020 Nov 18;10(1):20022. doi: 10.1038/s41598-020-76503-6.
Hydrogen, which is a new clean energy option for future energy systems possesses pioneering characteristics making it a desirable carbon-free energy carrier. Hydrogen storage plays a crucial role in initiating a hydrogen economy. Due to its low density, the storage of hydrogen in the gaseous and liquids states had several technical and economic challenges. Despite these traditional approaches, magnesium hydride (MgH), which has high gravimetric and volumetric hydrogen density, offers an excellent potential option for utilizing hydrogen in automobiles and other electrical systems. In contrast to its attractive properties, MgH should be mechanically and chemically treated to reduce its high activation energy and enhance its modest hydrogen sorption/desorption kinetics. The present study aims to investigate the influence of doping mechanically-treated Mg metal with 5 wt% amorphous ZrCu abrasive nanopowders in improving its kinetics and cyclability behaviors. For the first time, solid-waste Mg, Zr, and Cu metals were utilized for preparing MgH and amorphous ZrCu alloy (catalytic agent), using hydrogen gas-reactive ball milling, and arc melting techniques, respectively. This new nanocomposite system revealed high-capacity hydrogen storage (6.6 wt%) with superior kinetics and extraordinary long cycle-life-time (1100 h) at 250 °C.
氢作为未来能源系统的一种新型清洁能源选择，具有开拓性特征，使其成为理想的无碳能源载体。储氢在启动氢经济中起着关键作用。由于其低密度，气态和液态氢的储存存在若干技术和经济挑战。尽管有这些传统方法，但氢化镁（MgH）具有高的重量和体积氢密度，为在汽车和其他电气系统中利用氢提供了一个极好的潜在选择。与其吸引人的特性形成对比的是，MgH需要进行机械和化学处理以降低其高活化能并增强其适度的氢吸附/解吸动力学。本研究旨在研究用5 wt%非晶ZrCu磨料纳米粉末掺杂机械处理的镁金属对改善其动力学和循环性能的影响。首次分别使用氢气反应球磨和电弧熔炼技术，将固体废弃物镁、锆和铜金属用于制备MgH和非晶ZrCu合金（催化剂）。这种新型纳米复合系统在250℃下显示出高容量储氢（6.6 wt%），具有优异的动力学和超长的循环寿命（1100小时）。
