Outstanding hydrogen production properties of surface catalysts promoted Mg–Ni–Ce composites at room temperature in simulated seawater

• Published in: Journal of materials science 2020-10, Vol.55 (30), p.14922-14937
• Main Authors: Hou, Xiaojiang, Wang, Yi, Hou, Kaiming, Yang, Lu, Shi, Hongchang, Feng, Lei, Suo, Guoquan, Ye, Xiaohui, Zhang, Li, Yang, Yanling
• Format: Article
• Language: English
• Subjects: Alloys; Analysis; Ball milling; Catalysis; Catalysts; Cerium; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Conversion; Crystallography and Scattering Methods; Curve fitting; Energy Materials; Hydrogen; Hydrogen production; Hydrolysis; Magnesium base alloys; Magnesium castings; Materials Science; Molybdenum compounds; Molybdenum disulfide; Nickel; Polymer Sciences; Reaction kinetics; Room temperature; Sea-water; Seawater; Solid Mechanics; Thermodynamics
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-020-05065-9

The as-cast magnesium–nickel–cerium (Mg–Ni–Ce) alloys with nominal component (Mg–10 wt% Ni) 1− x Ce x ( x  = 0, 5, 10, 15 wt%) are optimized by high-energy ball milling (HEBM). Expandable graphite (EG) and molybdenum disulfide (MoS 2 ) have been introduced as surface catalysis to form (Mg10Ni) 95 Ce 5 –5 wt% EG–5 wt% MoS 2 composite. The synergetic effects of HEBM and catalysts on H 2 production of (Mg10Ni) 95 Ce 5 are comprehensively studied. The thermodynamics are studied by H 2 generation curves fitting. The HEBM 0Ce, 5Ce, 10Ce and 15Ce alloys at 291 K can generate 530, 747, 720 and 487 mL g −1 H 2 with conversion yields of 59%, 87%, 89% and 64% in initial 15 min, respectively. The addition of surface catalysts EG–MoS 2 can further enhance the initial hydrogen generation rate and the final conversion yield within short period at room temperature. 773 mL g −1 H 2 corresponding to 95% conversion yield can be obtained by HEBM (Mg10Ni) 95 Ce 5 –EG–MoS 2 within 1 min at 291 K. The synergetic effects of HEBM and EG–MoS 2 can promote rapid initial generation rate and high conversion yield of hydrolysis hydrogen generation of (Mg10Ni) 95 Ce 5 –EG–MoS 2 composite. This work indicates a promising way to synthesize Mg-based alloys with rapid initial hydrolysis H 2 generation kinetics and high conversion yield within a short period. Graphic abstract