Electrochemical Storage of Atomic Hydrogen on Single Layer Graphene - Processus d'activation sélective par transfert d'énergie uni-électronique ou radiatif Accéder directement au contenu
Article Dans Une Revue Journal of the American Chemical Society Année : 2021

Electrochemical Storage of Atomic Hydrogen on Single Layer Graphene

Résumé

If hydrogen can be stored and carried safely at a high density, hydrogen-fuel cells offer effective solutions for vehicles. The stable chemisorption of atomic hydrogen on single layer graphene (SLG) seems a perfect solution in this regard, with a theoretical maximum storage capacity of 7.7 wt %. However, generating hydrogenated graphene from H2 requires extreme temperatures and pressures. Alternatively, hydrogen adatoms can easily be produced under mild conditions by the electroreduction of protons in solid/liquid systems. Graphene is electrochemically inert for this reaction, but H-chemisorption on SLG can be carried out under mild conditions via a novel Pt-electrocatalyzed "spillover-surface diffusion-chemisorption" mechanism, as we demonstrate using dynamic electrochemistry and isotopic Raman spectroscopy. The apparent surface diffusion coefficient (∼10-5 cm2 s-1), capacity (∼6.6 wt %, ∼85.7% surface coverage), and stability of hydrogen adatoms on SLG at room temperature and atmospheric pressure are significant, and they are perfectly suited for applications involving stored hydrogen atoms on graphene.

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Chimie
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Dates et versions

hal-03551357 , version 1 (01-02-2022)

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Quanfeng He, Lanping Zeng, Lianhuan Han, Matthew M Sartin, Juan Peng, et al.. Electrochemical Storage of Atomic Hydrogen on Single Layer Graphene. Journal of the American Chemical Society, 2021, 143 (44), pp.18419-18425. ⟨10.1021/jacs.1c05253⟩. ⟨hal-03551357⟩
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