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- Title
High‐loading LiBH<sub>4</sub> Confined in Structurally Tunable Ni Catalyst‐decorated Porous Carbon Scaffold for Fast Hydrogen Desorption.
- Authors
Guo, Yusang; Liu, Yafei; Feng, Lizhuang; An, Cuihua; Wang, Yijing
- Abstract
Catalysts combined with nanoconfinement can improve the sluggish desorption kinetics and poor reversibility of LiBH4. However, at high LiBH4 loading, their hydrogen storage performance is significantly reduced. Herein, a porous carbon‐sphere scaffold decorated with Ni nanoparticles (NPs) was synthesised by calcining a Ni metal‐organic framework precursor, followed by partial etching of the Ni NPs to fabricate an optimised scaffold with a high surface area and large porosity that accommodates high LiBH4 loading (up to 60 wt.%) and exhibits remarkable catalyst/nanoconfinement synergy. Owing to the catalytic effect of Ni2B (formed in situ during dehydrogenation) and the reduced hydrogen diffusion distances, the 60 wt.% LiBH4 confined system exhibited enhanced dehydrogenation kinetics with >87% of the total hydrogen storage capacity released within 30 min at 375 °C. The apparent activation energies were significantly reduced to 110.5 and 98.3 kJ/mol, compared to that of pure LiBH4 (149.6 kJ/mol). Moreover, partial reversibility was achieved under moderate conditions (75 bar H2, 300 °C) with rapid dehydrogenation during cycling.
- Subjects
DEHYDROGENATION kinetics; DESORPTION kinetics; CATALYSIS; DESORPTION; HYDROGEN storage; CATALYTIC dehydrogenation; CARBON foams
- Publication
Chemistry - An Asian Journal, 2023, Vol 18, Issue 7, p1
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.202300009