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Volume 30
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10.3390/molecules30204057
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Tuning the Solid-State Hydrogen Release of Ammonia Borane by Entrapping the Intermediates: The Role of High-Boiling-Point Amines

by
Mattia Bartoli
1,2,*,
Giuseppe Ferraro
3,
Marco Etzi
1,2,
Stefania Lettieri
3,
Candido Fabrizio Pirri
1,3 and
Sergio Bocchini
1,2,3
1
Center for Sustainable Future Technologies—CSFT@POLITO, Via Livorno 60, 10144 Torino, Italy
2
Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via G. Giusti 9, 50121 Florence, Italy
3
Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy
*
Author to whom correspondence should be addressed.
Molecules 2025, 30(20), 4057; https://doi.org/10.3390/molecules30204057 (registering DOI)
Submission received: 4 September 2025 / Revised: 6 October 2025 / Accepted: 9 October 2025 / Published: 11 October 2025
(This article belongs to the Special Issue New Materials for Gas Capture and Conversion)
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Abstract

Ammonia borane is a promising hydrogen storage material due to its high hydrogen content, but its use as hydrogen carrier under thermal stimuli involves the production of several byproducts, such as borazine, reducing hydrogen purity and the overall efficiency. This work is focused on the use of high-boiling-point amines to modulate ammonia borane decomposition, aiming to enhance hydrogen release and suppress volatile NxBy species. Kissinger’s equation kinetics revealed that amines significantly influence the decomposition mechanism, and TGA-IR investigation showed a maximum of 2.4 wt.% of pure hydrogen release in the presence of triphenyl amine. Furthermore, the experimental data herein discussed, together with a computational study of activation energies, allowed us to derive a detailed mechanism that leads to a foundation for further advancement in the exploitation of ammonia borane as a hydrogen carrier, suggesting that the formation of linear species is anchored to amine over the release of borazine and production of poly borazine-like species.
Keywords: ammonia borane; hydrogen storage; reactivity; chemical bonded hydrogen ammonia borane; hydrogen storage; reactivity; chemical bonded hydrogen
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MDPI and ACS Style

Bartoli, M.; Ferraro, G.; Etzi, M.; Lettieri, S.; Pirri, C.F.; Bocchini, S. Tuning the Solid-State Hydrogen Release of Ammonia Borane by Entrapping the Intermediates: The Role of High-Boiling-Point Amines. Molecules 2025, 30, 4057. https://doi.org/10.3390/molecules30204057

AMA Style

Bartoli M, Ferraro G, Etzi M, Lettieri S, Pirri CF, Bocchini S. Tuning the Solid-State Hydrogen Release of Ammonia Borane by Entrapping the Intermediates: The Role of High-Boiling-Point Amines. Molecules. 2025; 30(20):4057. https://doi.org/10.3390/molecules30204057

Chicago/Turabian Style

Bartoli, Mattia, Giuseppe Ferraro, Marco Etzi, Stefania Lettieri, Candido Fabrizio Pirri, and Sergio Bocchini. 2025. "Tuning the Solid-State Hydrogen Release of Ammonia Borane by Entrapping the Intermediates: The Role of High-Boiling-Point Amines" Molecules 30, no. 20: 4057. https://doi.org/10.3390/molecules30204057

APA Style

Bartoli, M., Ferraro, G., Etzi, M., Lettieri, S., Pirri, C. F., & Bocchini, S. (2025). Tuning the Solid-State Hydrogen Release of Ammonia Borane by Entrapping the Intermediates: The Role of High-Boiling-Point Amines. Molecules, 30(20), 4057. https://doi.org/10.3390/molecules30204057

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