Chemphyschem : a European journal of chemical physics and physical chemistry
卷:20
期:10
页:1316-1324
DOI:10.1002/cphc.201900058
出版年:2019-May-16 (Epub 2019 Apr 08)
文献类型:Journal Article
摘要
Theoretically, the hydrolysis of MgLi and MgH2 -LiH can produce 9.6 and 17.5 wt.% hydrogen (water is not included in the calculation), respectively. The ball-milling method is commonly used to refine the particle size and thus may improve hydrolysis kinetics. However, Mg and Li will be easily agglomerated, which means that direct ball-milling could not refine MgLi. In this work, we introduced 10 wt.% expanded graphite into the ball-milling process to synthesize refined MgLi alloy samples. Further studies showed that MgLi-10 wt.% expanded graphite can produce 966 mL/g hydrogen within 3 min in 0.5 M MgCl2 solution. The MgLi hydrides were synthesized by reactive ball milling under 3 MPa H2 and their hydrolysis performance was investigated. Moreover, the sawed powder was milled in 3 MPa H2 for 6 h and then hydrogenated in 3 MPa H2 at 380°C; it can produce 1542 and 1773 mL/g (15.8 wt.%) hydrogen in 5 and 30 min with mild kinetics, respectively, and the activation energy of the hydrolysis reaction is 24.6 kJ/mol in 1 M MgCl2 solution. The findings here open a new avenue to the development of refined MgLi alloys and hydrides for hydrogen generation through a controllable hydrolysis process.
地址:School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510641, People's Republic of China. China-Australia Joint Laboratory for Energy & Environmental Materials, Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou, 510641, People's Republic of China. Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering (IAPME), Department of Physics and Chemistry, Faculty of Science and Technology, University of Macau, Macau SAR, China.
基金资助致谢
基金资助信息:
ID
机构
NSFC51621001
Foundation for Innovative Research Groups of the National Natural Science Foundation of China
51431001
National Natural Scence Foundation of China Projects
51771075
National Natural Scence Foundation of China Projects
Guangdong Province Universities and CollegesPearl River Scholar Funded Scheme
118/2016/A3
Macao Science and Technology Development Fund (FDCT)