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<p>To effectively enhance the catalytic activity of NiS, NiS particles confined into carbon fibers were prepared by electrostatic spinning followed pyrolyzation and NiS particles decorating was performed by further hydrothermal loading. The decorated NiS exhibits particle (NiS@PAN-NiS) and needle-like (NiS@PAN-NiS*) morphologies. After adding the catalysts into MgH<sub>2</sub>, the synthesized MgH<sub>2</sub>-5 wt% NiS@PAN-NiS composite can absorb 2.6 wt% hydrogen at 353&#xa0;K and release 5.0 wt% hydrogen within 1&#xa0;h at 573&#xa0;K. The initial hydrogen desorption temperature was reduced to 539&#xa0;K. The activation energies for hydrogen absorption/desorption were greatly reduced to 66.76 and 89.95&#xa0;kJ&#xa0;mol<sup>−1</sup>, respectively. The method of confining by electrospinning and particle decoration by hydrothermal loading reduce NiS particle agglomeration. The Mg<sub>2</sub>Ni/Mg<sub>2</sub>NiH<sub>4</sub> hydrogen pump formed by reaction between NiS and MgH<sub>2</sub> effectively enhanced hydrogen absorption and desorption kinetics. The formed MgS also improved the catalytic activity on the transformation of Mg and MgH<sub>2</sub>. Moreover, the carbon fibers should influence the contact between in situ formed MgS and Mg<sub>2</sub>Ni, providing more catalytic sites and hydrogen diffusion pathways. The construction of NiS/carbon fibers confined NiS composite by carbon fibers derived from pyrolyzation as medium provides considerable way for designing NiS-based catalysts to enhance the hydrogen storage performances of MgH<sub>2</sub>.</p> Graphical abstract <p></p>

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Construction of NiS/carbon fibers confined NiS composite: high catalytic activity for enhancing the hydrogen storage performances of MgH2

  • 期刊论文

  • 发表日期：

    2025年8月3日

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  • Ping Wu,
  • Li-Rong Xiao,
  • Cheng-Yu Ge,
  • Cui Ni,
  • Guo-Rong Wang,
  • Chuan-Xin Hou,
  • Hu Liu,
  • Zhen-Hui Ma,
  • Xin Liu,
  • Wei Du,
  • Xiu-Bo Xie

摘要

To effectively enhance the catalytic activity of NiS, NiS particles confined into carbon fibers were prepared by electrostatic spinning followed pyrolyzation and NiS particles decorating was performed by further hydrothermal loading. The decorated NiS exhibits particle (NiS@PAN-NiS) and needle-like (NiS@PAN-NiS*) morphologies. After adding the catalysts into MgH2, the synthesized MgH2-5 wt% NiS@PAN-NiS composite can absorb 2.6 wt% hydrogen at 353 K and release 5.0 wt% hydrogen within 1 h at 573 K. The initial hydrogen desorption temperature was reduced to 539 K. The activation energies for hydrogen absorption/desorption were greatly reduced to 66.76 and 89.95 kJ mol−1, respectively. The method of confining by electrospinning and particle decoration by hydrothermal loading reduce NiS particle agglomeration. The Mg2Ni/Mg2NiH4 hydrogen pump formed by reaction between NiS and MgH2 effectively enhanced hydrogen absorption and desorption kinetics. The formed MgS also improved the catalytic activity on the transformation of Mg and MgH2. Moreover, the carbon fibers should influence the contact between in situ formed MgS and Mg2Ni, providing more catalytic sites and hydrogen diffusion pathways. The construction of NiS/carbon fibers confined NiS composite by carbon fibers derived from pyrolyzation as medium provides considerable way for designing NiS-based catalysts to enhance the hydrogen storage performances of MgH2.

Graphical abstract