Mono- and Bimetalic Amidoboranes

Abstract

Abstract:In this review, we present an overview on metal amidoboranes, which have recently been considered as hydrogen storage materials for fueling of the low temperature fuel cells. We focus on amidoborane salts containing only metal cations and amidoborate anions. During the last decades, 19 new compounds from this group were described in the literature. We provide a summary of various physical and chemical properties of amidoborane compounds reported up to date.

Boron Nitride for Hydrogen Storage

“…[9] The aforementioned NH 3 BH 3 and LiNH 2 BH 3 ,t ogether with many others, are referred to as B-and N-based Hs toragem aterials. [15][16][17][18][19][20][21] There is also the H-free counterpart, that is, sp 2 boron nitride, BN, which can be found in the amorphous (a-BN), turbostratic (t-BN), rhombohedral (r-BN) and hexagonal (h-BN) phases. [22,23] In the following, we will not distinguish these phases and will use the label BN as representative of the sp 2 hybridization.…”

“…Actually,i th as been investigateda sb eing suitable for physicalH 2 storagea nd to al esser extent for chemical Hs torage. The development of BN has been neverthelessl imited in comparison to, for example, MOFs (in physical H 2 storage) and NH 3 BH 3 (in chemical H storage), [8,9,[15][16][17][18][19][20][21] although recent reports and achievements, mostlyb ased on computational calculations, have suggested new avenues for making BN one of the key materials of the near-future "hydrogen economy". This relativelya ctive area has not been the focus of ar ecent review yet;i ti st hus desirable and timelyt op resent ac omprehensive and detailed mini-Boron nitride, BN, for hydrogen storagee merged in the beginning of the millennium and there swiftly followed more than 15 years of effortsc ombining experimental laboratory works and to ag reater extent computational predictions.…”

In‐Situ and Real‐time Monitoring of Mechanochemical Preparation of Li2Mg(NH2BH3)4 and Na2Mg(NH2BH3)4 and Their Thermal Dehydrogenation

“…[12] It has been demonstrated by both experimental and theoretical studies that dehydrogenation performance of amidoboranes strongly depends on the ionicity and the size of the involved metalc ation.V arious metals pecies, havingd ifferent atomic radii, charge, electronegativity,a nd coordination number,f orm bondinginteractions with the (NH 2 BH 3 ) À group, enabling tailoring of relevant properties, especially when more than one metali si nvolved. [15][16][17][18][19] Several bimetallic amidoboranes of different stoichiometries were prepared by mechanical ball milling. [17][18][19][20][21][22] Although synthesisbyball millingisattractive due to its efficiency,often evidenced by quantitative and fast reactions occurring in as ingle step, [23] conducting mechanochemical reactionsi nc losed and oscillating reaction vessels usually prohibitedr eaction optimizationd ue to the inability to monitor its course without interrupting the milling process.…”

“…[15][16][17][18][19] Several bimetallic amidoboranes of different stoichiometries were prepared by mechanical ball milling. [17][18][19][20][21][22] Although synthesisbyball millingisattractive due to its efficiency,often evidenced by quantitative and fast reactions occurring in as ingle step, [23] conducting mechanochemical reactionsi nc losed and oscillating reaction vessels usually prohibitedr eaction optimizationd ue to the inability to monitor its course without interrupting the milling process. [24] Consequently,t hese reactions were usually treated as black-boxt echniques and were conducted undert entatively chosen conditions.…”

Boron-Based (Nano-)Materials: Fundamentals and Applications

“…Owarzany et al [12] present an overview on metal amidoboranes M(NH2BH3) with M = Li, Na, K, Rb, Cs, Mg, Ca, Sr, Y, Al, and Zn. Amidoboranes constitute a constantly growing family of NH3BH3 derivatives, especially investigated as solid-state chemical hydrogen storage materials.…”