Effects of nano-molybdenum coatings on the hydrogen storage properties of La–Mg–Ni based alloys. (September 2020)

• Record Type: Journal Article
• Authors: Zhang, Huaiwei; Bao, Liang; Qi, Jianbo; Xuan, Weidong; Fu, Li; Yuan, Yongjun
• Is Part Of: Renewable energy. Volume 157(2020)
• Page Start: 1053
• Page End: 1060
• Publication Date: 2020-09
• Subjects: Hydrogen storage -- Surface modification -- Electrode -- Magnetron sputtering; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2020.05.078
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: A relatively simple, but very effective method via magnetron sputtering process was used in the surface doping of the electrode plates. Molybdenum nano-particles coated electrodes were studied in the paper. The flower-like deposits appeared on the electrode plate surface, and Ni4 Mo could be in-situ formed with the coating process. The hydrogen ab/desorption rates were accelerated at the beginning and dropped subsequently. The max discharge capacity and retention rate after twenty cycles of the St 5min sample reached about 370mAh/g and 92%, respectively. Comparing to the typical hydrogen storage alloys, they were much closed to the A2 B7 -type and have surpassed the most AB3 -type Co-containing alloys. The activation energies and enthalpies of the various electrodes during the ab/dehydrogenation process were also discussed in details. Graphical abstract: Image 1 Highlights: Nano-Mo based coatings were used as surface modification for H2 storage alloy. Electrode surface transitions during the coating process were discussed. C max and S 20 surpassed the most AB5 -type alloys, and closed to the A2 B7 -type. Properties improvements were related to the newer formed Ni4 Mo compounds.