Preparation of Mg88Ce4Ca6In2 Hydrogen Storage Material and Its Hydrolysis Performance for Hydrogen Release
ZHANG Qianqian1, ZHAO Yang1,*, LI Jianqiu1,2,*, YONG Hui3, ZHENG Yue4, SONG Feifei4, WANG Yanhao1, KANG Zhong1
1 Research Center for Undersea Energy and Power Systems, China Institute of Ocean Engineering (Qingdao), Qingdao 266500, Shandong, China 2 School of Vehicle and Mobility, Tsinghua University, Beijing 100084 3 School of Materials Science & Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China 4 China North Nuclear Fuel Co., Ltd., Baotou 041035, Inner Mongolia, China
Abstract: According to hydrogen fuel cell hydrogen supply system requirements, the Mg-Ce-Ca-In/Fe@C-BM composites were successfully prepared by taking Mg as the base element, introducing Ce, Ca, In elements and combining with Fe@C catalyst. XRD, SEM, particle size distribution and other methods were used to analyze phase composition and characterize the microstructure of these samples before and after hydrogenation, and the properties of hydrogen absorption of different component alloys and hydrolysis performance of hydrogenated materials were studied. In addition, the test system for hydrolytic hydrogen release was also designed and established to evaluate the hydrolysis performance of 300-gram-scale hydrogen release system. The results show that there are Mg-(Ce/Ca/In) alloy phases in the alloy Mg88Ce4Ca6In2, and the correspon-ding hydrides are formed after hydrogenation, which can improve the hydrogen absorption and hydrolysis properties obviously. And the pretreatment method of adding catalyst and then ball-milling can further improve the hydrogen storage density of materials, including alloys and hydroge-nated samples. The hydrolysis reaction of H-Mg88Ce4Ca6In2/Fe@C-BM prepared in batches was carried out in the citric acid solution under the condition of 80 ℃ water bath, and the average amount of hydrogen generated reached 1 646 mL/g within 3 min. In the hectogram-scale hydrolytic hydrogen release test system, total hydrogen release reaches 345 SL in 5 hours, and the unit hydrogen emission release 1.15 SL/g, which can supply hydrogen stably at a 2 L/min flow rate to meet the stable supply of hydrogen for back-end fuel cells.
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2025, Vol. 39 
