期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 789, 期 -, 页码 768-776出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.03.149
关键词
Mg hydride; rGO; NiCu nanoparticle; Layered double hydroxide; Synergistic effect
资金
- National Natural Science Foundation of China [51771092, 51801100, 51571112]
- Natural Science Foundation of Jiangsu Province [BK20161004]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [18KJB430014]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX18_0341]
- China Postdoctoral Science Foundation [2016M601790]
- Six Talent Peaks Project in Jiangsu Province (2018) [XNY-020]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
A reduced graphene oxide-supported NiCu nanocatalyst (NiCu/rGO) was prepared via the reduction of self-assembled layered double hydroxide (LDH) and graphene oxide (GO) composite precursor. The effect of NiCu/rGO on the hydrogen sorption kinetics of MgH2 was investigated systematically. TEM observations reveal that the ultrafine NiCu (6 nm) particles highly disperse on the rGO surface. Hydrogen storage measurements reveal that MgH2-5 wt.% NiCu/rGO has superior hydrogen sorption kinetics over as-milled MgH2 and MgH2-5 wt.% NiCu without rGO. MgH2-5 wt.% NiCu/rGO absorbs 5.0 wt% hydrogen within 100 sat 200 degrees C, while MgH2-5 wt.% NiCu only absorbs 2.0 wt% hydrogen and as-milled MgH2 hardly absorbs hydrogen under the same conditions. Moreover, MgH2-5 wt.% NiCu/rGO starts to desorb hydrogen at 185 degrees C, which is 115 degrees C lower than that of as-milled MgH2, and desorbs 5.8 wt% hydrogen within 1200 sat 300 degrees C. The apparent activation energy for hydrogen desorption of MgH2-5 wt.% NiCu/rGO is 71.7 kJ/mol H-2, significantly lower than 107.3 kJ/mol H-2 for MgH2-5 wt.% NiCu. The enhanced hydrogen sorption kinetics of MgH2-5 wt.% NiCu/rGO mainly attributes to the synergistic effect between rGO and NiCu nanoparticles. This research extends the knowledge of designing efficient catalyst via layered double hydroxides precursor in the hydrogen storage materials. (C) 2019 Elsevier B.V. All rights reserved.
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