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Article Dans Une Revue Electrochimica Acta Année : 2018

Single LiBH 4 nanocrystal stochastic impacts at a micro waterjionic liquid interface

Résumé

LiBH 4 is often employed as a reducing agent for metal nanoparticle (NP) preparation but is inherently a solid-state H 2 hydrogen storage agent. Herein it is shown, through a combination of electron/optical microscopies and single entity electrochemical study, that LiBH 4 is stored in the solid state within an ionic liquid (IL) as nanocrystals (NCs). The electrochemical monitoring of an immiscible waterjIL (wjIL) micro-liquidjliquid interface (LLI) shows interfacial charge exchange associated with the stochastic impacts of single NCs. Meanwhile, in situ optical monitoring of a wjmetal or wjIL interface shows that such impacts are associated with the development of a H 2-in-IL micro/nano-foam related to the poor solu-bility of H 2. Both the presence of solid NCs and the latter H 2-in-IL foam suggest that H 2 release from LiBH 4-in-IL is a slow, but likely controlled process. The rate of H 2 production at a macroscopic LLI is further confirmed by gas chromatographic measurements, in very good agreement with microscopic observations. The electrochemical LLI provides unique investigative access to LiBH 4 NCs and offers insight into H 2 storage in ILs, or for direct borohydride fuel cells, as well as NP synthesis.
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Dates et versions

hal-02353907 , version 1 (07-11-2019)

Identifiants

  • HAL Id : hal-02353907 , version 1

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T Jane Stockmann, Jean-François Lemineur, Huiyin Liu, Claudio Cometto, Marc Robert, et al.. Single LiBH 4 nanocrystal stochastic impacts at a micro waterjionic liquid interface. Electrochimica Acta, 2018. ⟨hal-02353907⟩
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