Improved hydrogen desorption properties of ammonia borane by Ni-modified metal-organic frameworks

Si, Xiaoliang; Sun, Lixian; Xu, Fen; Jiao, Chengli; Li, Fen; Liu, Shu-Sheng; Zhang, Jian; Song, Lifang; Jiang, Chunhong; Wang, Shuang; Liu, Yingliang; Sawada, Yutaka

doi:10.1016/j.ijhydene.2011.02.102

Cited by 66 publications

(47 citation statements)

References 39 publications

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“…The values of the pre-exponential factor (A 0 , min −1 ) are 8.30700 × 10 22 (±0.1 × 10 6 ) for AB 93% and 0.29295 × 10 22 (±0.2 × 10 6 ) for AB 79%. Note that the values E a~1 60-180 kJ/mol have also been reported in other studies devoted to solid-state AB dehydrogenation [11,[28][29][30][31]. The obtained values of the apparent energy of activation are in good agreement with the value of 161 ± 7 kJ/mol given in our previous study [14], where the kinetic curves of hydrogen release in the thermolysis of a mixture of 87% pure AB with quartz sand under the isothermal conditions (85-99 • C) were described by the empirical Avrami-Erofeev Equation.…”

Section: Resultssupporting

confidence: 78%

The Effect of Storage-Induced Changes in Ammonia Borane on Hydrogen Release during Its Low-Temperature Thermolysis

et al. 2019

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In this paper, low-temperature solid-state processes of the dehydrogenation of ammonia borane (NH 3 BH 3 , AB) samples of different purity are compared under the conditions of isothermal heating at 100 • C, as well as in the course of thermal analysis which was also carried out at different rates of heating. The composition of boron-containing impurities was studied by attenuated total reflection Fourier transform infrared spectroscopy (ATR FTIR) and 11 B magic angle spinning nuclear magnetic resonance ( 11 B MAS NMR). Accumulation in AB of three-and four-coordinated borate anions upon contact of hydride with air moisture is established. The apparent activation energies were calculated from thermal analysis data, and found to decrease from 174 to 163 kJ/mol as the AB purity decreased from 93% to 79%. This showed itself in a shortening of the induction period during the AB thermolysis under isothermal conditions. The prospects of using the thermal analysis for estimating NH 3 BH 3 reactivity are discussed.

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Section: Resultssupporting

confidence: 78%

The Effect of Storage-Induced Changes in Ammonia Borane on Hydrogen Release during Its Low-Temperature Thermolysis

et al. 2019

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“…Another notable effect resulting from the MS curves is the evolution of the borazine, ammonia, and diborane byproducts (m/z = 80, m/z = 16, and m/z = 27) that are depressed completely for AB@M 1.5 , which is more predominant than most of the previous reports. 61,64 The isothermal volumetric hydrogen release properties of the pristine AB and AB@M 1.5 sample were measured at 90°C to compare the gas release rate as well as the hydrogen release kinetics (Figure 8b). Clearly, sluggish gas desorption and only 4.8 wt % weight desorption up to 200 min are observed for pristine AB, which may be ascribed to its high kinetic barrier for dehydrogenation at this temperature.…”

Section: Scheme 1 Schematic Illustration Of Evolution Of Yolk−shell mentioning

confidence: 99%

Microwave Hydrothermal Synthesis of Ni-based Metal–Organic Frameworks and Their Derived Yolk–Shell NiO for Li-Ion Storage and Supported Ammonia Borane for Hydrogen Desorption

Kong

Dai

et al. 2015

ACS Sustainable Chem. Eng.

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This paper reports fast microwave hydrothermal synthesis of Ni-based metal−organic frameworks (Ni-MOFs) and their derived yolk−shell NiO structures by direct calcination in air. The molar ratio of the Ni ion to the benzene-1,3,5-tricarboxylic acid (H 3 BTC) ligand has important influence on the NiO morphologies and their electrochemical performances. The obtained yolk−shell NiO microsphere displays a large reversible capacity of 1060 mAh g −1 at a small current density of 0.2 A g −1 and a good high-rate capability when evaluated as an anode for rechargeable lithium-ion batteries. Moreover, the facilitated hydrogen release from ammonia borane (AB) at a lower temperature and the depressed release of undesired volatile byproducts are also observed in the Ni-MOFs supported AB.There is a increasing demand to make efficient use of energy and to find renewable and clean energy sources that can substitute for fossil fuels. 1,2 Energy storage, an important intermediate step toward versatile, clean, and efficient energy applications, has received worldwide concern both in academia and industry. 3−7 Among various candidates of energy storage systems, lithium-ion batteries (LIB) and fuel cells have received considerable attention owing to their high energy densities and environmental benignity. 8−16 LIB, one of the most important rechargeable batteries, have been widely used due to their high energy density and long cycle life. 10,17,18 Metal oxides such as NiO have long been extensively investigated as a potential electrode material for LIBs because of their 2−3 times higher theoretical capacities than commercial graphite electrodes. 19−42 However, their cycling performances and high-rate capabilities are still not satisfactory due to the large volume change associated with lithium insertion and extraction and poor electrical conductivity. 32−38,40−42 Hydrogen is one of the most promising candidates to replace nonrenewable fuel sources because it can react with oxygen to generate electricity with high energy density without byproducts. 43−45 Thus, hydrogen has been regarded as a suitable energy carrier for energy production from primary sources. Advanced materials are highly desired that can store a large amount of hydrogen at mild conditions (common temperature and relatively low pressure) along with a fast release kinetics. 46 Over the past decade, ammonia borane (NH 3 BH 3 , AB) has received much attention as a solid-state hydrogen storage medium because of its satisfactory stability, relatively low molecular mass, and remarkably high energy density. 47−50 However, its practical application is greatly limited by the poor kinetics of hydrogen generation below 85°C and the release of impurities that are detrimental to fuel cells.Metal−organic frameworks (MOFs) are porous materials synthesized by assembling metal ions with organic bridging ligands. 51,52 The metal ions in the MOFs can be thermally transformed into metal oxides, and the C and other elements are oxidized into gas molecules after calcining the MOFs in air at e...

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“…The band at lower wavelength can be assigned to the π→π * transition because of the existence of aromatic ring structures in the ligands (Modrow et al 2012). And, the two significant bands in the visible region could be attributed to A 2g →T 1g and A 2g →T 2g d-d transitions due to Cr(III) (Köhler et al 2000;Modrow et al 2012;Si et al 2011). When CdS was embedded on the MIL-100, the obtained samples exhibit enhanced absorbance at 300 to 500 nm in comparison with bare MIL-100.…”

Section: Catalyst Characterizationsmentioning

confidence: 97%

Solar Light Photocatalytic Degradation of Nitrite in Aqueous Solution Over CdS Embedded on Metal–Organic Frameworks

Yang

Chen

et al. 2015

Water Air Soil Pollut

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A CdS embedded metal-organic framework (MIL-100) composite was synthesized and used for photocatalytic degradation of nitrite ions. The obtained samples were characterized by a series of techniques such as X-ray diffraction (XRD), N 2 adsorption/desorption, transmission electron microscopy (TEM) and UVVis diffuse reflectance spectra (DRS). The results show that CdS nanoparticles were dispread and embedded on the MIL-100 crystals. The CdS/MIL-100 composites exhibited significant activities for photocatalytic degradation of nitrite ions through a disproportionation process in a neutral aqueous solution without any sacrificial reagents. When 20 wt% of CdS was embedded, the highest degradation yield of 92 % was achieved in 10-ppm NaNO 2 aqueous solution under simulated solar light irradiation, which was fivefold of bare CdS. The enhancement in photocatalytic activities could be contributed to photosensitization and supporting of metalorganic framework scaffold.

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Improved hydrogen desorption properties of ammonia borane by Ni-modified metal-organic frameworks

Cited by 66 publications

References 39 publications

The Effect of Storage-Induced Changes in Ammonia Borane on Hydrogen Release during Its Low-Temperature Thermolysis

The Effect of Storage-Induced Changes in Ammonia Borane on Hydrogen Release during Its Low-Temperature Thermolysis

Microwave Hydrothermal Synthesis of Ni-based Metal–Organic Frameworks and Their Derived Yolk–Shell NiO for Li-Ion Storage and Supported Ammonia Borane for Hydrogen Desorption

Solar Light Photocatalytic Degradation of Nitrite in Aqueous Solution Over CdS Embedded on Metal–Organic Frameworks

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