Abstract
A highly efficient, safe, and non-toxic polysulfide material (Fe7S8) can remarkably enhance the kinetics of MgH2.
Highlights
The global environmental issues related to the excessive emission of greenhouse gases and burning of fossil materials have driven us to center our attention on alternative energy sources that can be extensively developed and widely used.[1,2,3,4] hydrogen energy is deemed as one of the most potential and ideal energy alternatives on account of its high energy density and clean and environmentally friendly nature.[5,6,7,8] the practical application and popularization of hydrogen is still hindered by numerous complicated technical hurdles
The MgH2 + 16.7 wt% Fe7S8 composite prepared by ball-milling method offers a striking catalytic activity for hydrogenation kinetics, and reduces the initial decomposition temperature for MgH2
MgH2–Fe7S8 composite was synthesized through the ballmilling method by mechanical milling of MgH2 and Fe7S8 with a weight ratio of 5 : 1. To reduce the increasing temperature, the milling process was launched at a speed of 350 rpm and ballmilled in one direction for 0.5 h and paused for about 0.25 h, unceasingly starting in another direction for 0.5 h
Summary
The global environmental issues related to the excessive emission of greenhouse gases and burning of fossil materials have driven us to center our attention on alternative energy sources that can be extensively developed and widely used.[1,2,3,4] hydrogen energy is deemed as one of the most potential and ideal energy alternatives on account of its high energy density and clean and environmentally friendly nature.[5,6,7,8] the practical application and popularization of hydrogen is still hindered by numerous complicated technical hurdles. In addition to iron and its compounds, sulfide compounds showed remarkable catalytic activities for the improvement of sorption kinetics and thermodynamic properties of MgH2. Multi-valent catalysts showed great potential in enhancing de-/hydrogenation kinetics of MgH2 as reported by Xie and co-workers.[30] the excellent hydrogen storage behavior of MgH2 might be related to the unstable Fe2+. Fe7S8 is a polysulfide containing iron; multi-valent and unstable Fe2+ exist in Fe7S8, which might contribute to the enhancement of the hydrogen storage capacity of MgH2. The corresponding catalytic mechanism of Fe7S8 to the enhancement of hydrogen properties of the pristine MgH2 was presented based on the information reflected by hydrogen absorption/desorption kinetics, phase compositions and microstructure observations
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