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Amorphous-Carbon-Supported Ultrasmall TiB2 Nanoparticles With High Catalytic Activity for Reversible Hydrogen Storage in NaAlH4

Authors
  • Zhang, Xin1
  • Zhang, Xuelian1
  • Ren, Zhuanghe1
  • Hu, Jianjiang2
  • Gao, Mingxia1
  • Pan, Hongge1
  • Liu, Yongfeng1
  • 1 State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou , (China)
  • 2 School of Chemistry and Chemical Engineering, Yantai University, Yantai , (China)
Type
Published Article
Journal
Frontiers in Chemistry
Publisher
Frontiers Media S.A.
Publication Date
May 15, 2020
Volume
8
Identifiers
DOI: 10.3389/fchem.2020.00419
Source
Frontiers
Keywords
Disciplines
  • Chemistry
  • Original Research
License
Green

Abstract

In this paper, we report amorphous-carbon-supported TiB2 nanoparticles having sizes of 2–4 nm ([email protected]) as highly active catalysts for hydrogen storage in NaAlH4. [email protected] was synthesized by a simple calcination at 550°C with Cp2TiCl2 and MgB2 (molar ratio of 1:1) as precursors. The addition of 7 wt% [email protected] reduced the onset dehydrogenation temperature of NaAlH4 by 100 to 75°C. A practically available hydrogen capacity of 5.04 wt% could be desorbed at 140°C within 60 min, and completely hydrogenated at 100°C within 25 min under a hydrogen pressure of 100 bar. Notably, the hydrogen capacity was almost unchanged after 20 cycles, which shows the stable cyclability, considerably higher than those of structures catalyzed by Ti halides or TiO2. The stable catalytic function was closely related to the in-situ-formed Ti–Al alloy, which considerably facilitated the dissociation and recombination of H–H and Al–H bondings.

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