Surface-Controlled Conversion of Ammonia Borane from Boron Nitride
1
Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan
2
Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan
3
Materials Physics and Applications Division, Los Alamos National Laboratory, MS J514 Los Alamos National Laboratory, Los Alamos, NM 87575, USA
4
Institute for Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(21), 5569; https://doi.org/10.3390/en13215569
Received: 1 October 2020
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Revised: 18 October 2020
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Accepted: 20 October 2020
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Published: 23 October 2020
(This article belongs to the Special Issue Hydrogen Energy Technologies: Recent Advances in Production, Storage and Applications)
“One-pot regeneration”, which is simple regneneration method of ammonia borane (AB) using hydrazine and liquid ammonia, enables conversion of AB from hexagonal boron nitride (h-BN) after milling hydrogenation. Solution 11B-NMR revealed the presence of AB after NH3/N2H4 treatment of milled h-BN (BNHx) although the yield of AB was less than 5%. The conversion mechanism was clarified as B-H bonds on the h-BN surface created by ball-milling under hydrogen pressure have an ability to form AB, which was confirmed by Thermogravimetry-Residual Gas Analysis (TG-RGA) and Infrared (IR) analysis. The reaction routes are also the same as regeneration route of polyborazylene because intermediates of AB such as (B(NH2)3 and hydrazine borane were found by solution 11B-NMR after soaking BNHx in liquid NH3 and hydrazine, respectively. Because of the fact that all reactions proceed on the h-BN surface and no reaction proceeds when neat h-BN is treated, breaking of B3N3 ring structure and then creation of B-H bond is the key issue to increase conversion yield of AB.
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Keywords:
hydrogen storage; ammonia borane; boron nitride; milling; nuclear magnetic resonance; hydrogenation
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MDPI and ACS Style
Nakagawa, T.; Uesato, H.; Burrell, A.K.; Ichikawa, T.; Miyaoka, H.; Davis, B.L.; Kojima, Y. Surface-Controlled Conversion of Ammonia Borane from Boron Nitride. Energies 2020, 13, 5569. https://doi.org/10.3390/en13215569
AMA Style
Nakagawa T, Uesato H, Burrell AK, Ichikawa T, Miyaoka H, Davis BL, Kojima Y. Surface-Controlled Conversion of Ammonia Borane from Boron Nitride. Energies. 2020; 13(21):5569. https://doi.org/10.3390/en13215569
Chicago/Turabian StyleNakagawa, Tessui, Hiroki Uesato, Anthony K. Burrell, Takayuki Ichikawa, Hiroki Miyaoka, Benjamin L. Davis, and Yoshitsugu Kojima. 2020. "Surface-Controlled Conversion of Ammonia Borane from Boron Nitride" Energies 13, no. 21: 5569. https://doi.org/10.3390/en13215569
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