Understanding Hydrogenation Chemistry at MgB2 Reactive Edges from Ab Initio Molecular Dynamics

Ray, Keith G.; Klebanoff, Leonard E.; Stavila, Vitalie; Kang, ShinYoung; Wan, Liwen F.; Li, Sichi; Heo, Tae Wook; Allendorf, Mark D.; Lee, Jonathan R. I.; Baker, Alexander A.; Wood, Brandon C.

doi:10.1021/acsami.1c23524

Title: Understanding Hydrogenation Chemistry at MgB₂ Reactive Edges from Ab Initio Molecular Dynamics

Journal Article · Wed Mar 23 00:00:00 EDT 2022 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.1c23524· OSTI ID:1880957

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Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Solid-state hydrogen storage materials often operate via transient, multistep chemical reactions at complex interfaces that are difficult to capture. Here, we use direct ab initio molecular dynamics simulations at accelerated temperatures and hydrogen pressures to probe the hydrogenation chemistry of the candidate material MgB₂ without a priori assumption of reaction pathways. Focusing on highly reactive ($$10\overline{1}0$$) edge planes where initial hydrogen attack is likely to occur, we track mechanistic steps toward the formation of hydrogen-saturated BH₄^– units and key chemical intermediates, involving H₂ dissociation, generation of functionalities and molecular complexes containing BH₂ and BH₃ motifs, and B–B bond breaking. Further, the genesis of higher-order boron clustering is also observed. Different charge states and chemical environments at the B-rich and Mg-rich edge planes are found to produce different chemical pathways and preferred speciation, with implications for overall hydrogenation kinetics. The reaction processes rely on B–H bond polarization and fluctuations between ionic and covalent character, which are critically enabled by the presence of Mg²⁺ cations in the nearby interphase region. Our results provide guidance for devising kinetic improvement strategies for MgB₂-based hydrogen storage materials, while also providing a template for exploring chemical pathways in other solid-state energy storage reactions.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC52-07NA27344; NA0003525

OSTI ID:: 1880957

Report Number(s):: LLNL-JRNL-829744; 1045742; TRN: US2307791

Journal Information:: ACS Applied Materials and Interfaces, Vol. 14, Issue 18; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Understanding Hydrogenation Chemistry at MgB2 Reactive Edges from Ab Initio Molecular Dynamics

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Title: Understanding Hydrogenation Chemistry at MgB₂ Reactive Edges from Ab Initio Molecular Dynamics