Rapid catalytic hydrolysis performance of Mg alloy enhanced by MoS 2 auxiliary mass transfer
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Rapid catalytic hydrolysis performance of Mg alloy enhanced by MoS2 auxiliary mass transfer Kaiming Hou1, Xiaohui Ye1,* , Xiaojiang Hou1,2, Yi Wang1, Lu Yang1, Hongchang Shi1, Lei Feng1, Guoquan Suo1, Li Zhang1, and Yanling Yang1 1
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Material Science and Engineering, Shaanxi University of Science and Technology, 710021 Xi’an, China 2 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072 Xi’an, China
Received: 1 September 2020
ABSTRACT
Accepted: 9 November 2020
Mg10Ni-MoS2 composites were synthesized, and the amount of molybdenum disulfide (MoS2) and ball milling time was optimized to obtain rapid initial kinetics with high conversion yield at room temperature in simulated seawater. The microstructures and H2 generation thermodynamics were comprehensively investigated to demonstrate the main influential factors on excellent initial hydrolysis performance. Mg10Ni-5 wt%MoS2-15 min can generate 493.3 mLg-1 H2 at 298 K with 58% yield in 20 s. The H2 generation capabilities of Mg10Ni5 wt% MoS2-15 min are 569 mLg-1 H2 and 67%, which are higher than those of Mg10Ni (495 mLg-1 H2, 56%) in 2 min. The lowest hydrolysis activation energy (18.74 kJmol-1) can be achieved by Mg10Ni-5 wt%MoS2, which means low energy consumption. Mg10Ni with higher specific surface area (4.04 m2g-1) than that of Mg10Ni-5wt.%MoS2-15 min (0.78 m2g-1) presents worse H2 generation performance, indicating that higher specific surface area is the secondary determinant for superior initial hydrolysis kinetics and higher conversion yield compared with the added MoS2. The added MoS2 with specific morphologic structure can provide auxiliary mass transfer paths, which shorten the transfer distance and destroy the continuous colloidal layer. Mg-rich alloys optimized for rapid and efficient H2 production performance are expected to be applied large-scale H2 generators.
Published online: 23 November 2020
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Catalin Croitoru.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05552-z
4811
J Mater Sci (2021) 56:4810–4829
GRAPHICAL ABSTRACT
Introduction In this era of globalization, owing to unceasing advance of human society, the whole world is facing severe energy shortage [1–3]. Seeking sustainable energies as well as green energy technologies is extremely urgent [4, 5]. Hydrogen energy is consistently regarded as a strong competitor due to its zero emission, recycling and high energy density [6, 7]. And first of all, a fast and efficient hydrogen source is required [8, 9]. Traditional gas-reforming H2 generation method relies on fossil fuels (coal, oil and natural gas, etc.), which is not sustainable and green manufacturing due to raw materials and emission of CO2 [10, 11]. Some active metals as well as their alloys, such as Mg, Al, Zn and Fe, present superior activity and can
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