Surface-Controlled Conversion of Ammonia Borane from Boron Nitride

Tessui Nakagawa, Hiroki Uesato, Anthony K. Burrell, Takayuki Ichikawa, Hiroki Miyaoka, Benjamin L. Davis and Yoshitsugu Kojima
Additional contact information
Tessui Nakagawa: Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan
Hiroki Uesato: Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan
Anthony K. Burrell: Materials Physics and Applications Division, Los Alamos National Laboratory, MS J514 Los Alamos National Laboratory, Los Alamos, NM 87575, USA
Takayuki Ichikawa: Institute for Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
Hiroki Miyaoka: Institute for Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
Benjamin L. Davis: Materials Physics and Applications Division, Los Alamos National Laboratory, MS J514 Los Alamos National Laboratory, Los Alamos, NM 87575, USA
Yoshitsugu Kojima: Institute for Advanced Materials Research, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan

Energies, 2020, vol. 13, issue 21, 1-9

Abstract: “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 11 B-NMR revealed the presence of AB after NH 3 /N 2 H 4 treatment of milled h-BN (BNH x ) 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(NH 2 ) 3 and hydrazine borane were found by solution 11 B-NMR after soaking BNH x in liquid NH 3 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 B 3 N 3 ring structure and then creation of B-H bond is the key issue to increase conversion yield of AB.

Keywords: hydrogen storage; ammonia borane; boron nitride; milling; nuclear magnetic resonance; hydrogenation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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