A portable hydrogen generation system: Catalytic hydrolysis of ammonia–borane

Xu, Qiang; Chandra, Manish

doi:10.1016/j.jallcom.2007.01.040

Cited by 263 publications

(129 citation statements)

References 21 publications

(41 reference statements)

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“…The oxidation of AB commences at -1.02 V which is 0.08 V more positive than that at a Au microdisc. 15 In the forward sweep an oxidation peak a1 was recorded at -0.84 V followed by a broad oxidation wave a2 from -0.49 to -0.10 V. The location of the anodic features a1 and a2 agree with those reported in our microdisc studies of AB and DMAB oxidation at Au 15,21 and with those reported by Finkelstein et al 25 They identified two regions of mass transport limited current for BH 3 17 for the oxidation of 20 mM AB in 2 M NaOH at 100 mV s -1 at a Au disc. They assigned this to electrooxidation of H 2 generated from the hydrolysis of AB which they confirmed by its disappearance upon the addition of thiourea which inhibits the recombination of surface hydrogen radicals.…”

Section: Electrooxidation Of Ab At Au Discsupporting

confidence: 88%

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Nanoporous Gold Catalyst for Direct Ammonia Borane Fuel Cells

Nagle

Rohan

2011

J. Electrochem. Soc.

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Nanoporous gold (NPG) electrodes were fabricated in film and wire array formats by selectively dealloying Ag from Au0.18Ag0.82. The ammonia borane (AB) oxidation reaction was studied by cyclic voltammetry at the NPG electrodes. The onset potential for the oxidation at NPG in a wire array format shifted to more negative potentials than that observed at a Au disc and higher currents were realised. An onset potential of −1.30 V vs. SCE was recorded which is 0.28 V lower than that at a Au disc. The oxidation current for 20 mM AB in 1 M NaOH increased from 2.65 mA cm−2 at a Au disc to 13.1 mA cm−2 at a NPG wire array. NPG is a viable candidate as an anode catalyst for a direct ammonia borane fuel cell.

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Section: Electrooxidation Of Ab At Au Discsupporting

confidence: 88%

“…It can be safely handled at room temperature. It has been shown that hydrogen can be released from AB via catalytic hydrolysis [1][2][3][4][5][6][7][8][9][10] or thermal decomposition. [11][12][13][14] The rate of hydrolysis of AB (Eq.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Gold Catalyst for Direct Ammonia Borane Fuel Cells

Nagle

Rohan

2011

J. Electrochem. Soc.

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“…[11] In the absence of an alkaline solution, NaBH 4 spontaneously reacts with water. [23] The hydrolysis of NaBH 4 can effectively liberate hydrogen at room temperature in the presence of a catalyst via the following reaction [Equation (1)]: [10,12,22,[24][25][26] …”

Section: Catalytic Hydrolysis Of Sodium and Lithium Borohydridesmentioning

confidence: 99%

“…[10,12,13,47] There are significant reports on the generation of hydrogen from the thermal decomposition of AB, and the thermal decomposition temperature of AB can be lowered in an organic solution or ionic liquid. [48] Loading AB into mesoporous silica (SBA-15), mesoporous carbon (CMK-3), or Li-doped AB/CMK-3 can benefit the thermal decomposition of AB, where the temperature threshold for the generation of hydrogen and volatile byproducts are obviously lower than those for neat AB.…”

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confidence: 99%

Liquid‐Phase Chemical Hydrogen Storage: Catalytic Hydrogen Generation under Ambient Conditions

et al. 2010

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There is a demand for a sufficient and sustainable energy supply. Hence, the search for applicable hydrogen storage materials is extremely important owing to the diversified merits of hydrogen energy. Lithium and sodium borohydride, ammonia borane, hydrazine, and formic acid have been extensively investigated as promising hydrogen storage materials based on their relatively high hydrogen content. Significant advances, such as hydrogen generation temperatures and reaction kinetics, have been made in the catalytic hydrolysis of aqueous lithium and sodium borohydride and ammonia borane as well as in the catalytic decomposition of hydrous hydrazine and formic acid. In this Minireview we briefly survey the research progresses in catalytic hydrogen generation from these liquid-phase chemical hydrogen storage materials.

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“…Boron-nitrogen containing compounds are expected to find applications in hydrogen storage materials because of their high hydrogen density [6,7]. In particular, ammonia borane (NH 3 BH 3 ) has attracted a great deal of attention due to its high hydrogen content (19.6 wt%), low molecular weight (30.9 g/mol), and high stability [8][9][10][11][12]. Additionally, NH 3 BH 3 releases hydrogen via a hydrolysis reaction in the presence of suitable acids and catalysts at room temperature (Eq.…”

Section: Introductionmentioning

confidence: 99%

Influence of morphology of hollow silica–alumina composite spheres on their activity for hydrolytic dehydrogenation of ammonia borane

et al. 2017

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Hollow silica-alumina composite spheres were prepared by a polystyrene (PS) template method using various amounts of PS suspension. Homogeneous hollow spheres prepared using 40 g were found to be with a diameter of about 300 nm in scanning electron microscopy, and transmission electron microscopy demonstrated their hollow sphere morphology. From the nitrogen adsorption isotherm results, the homogeneous hollow spheres prepared using 40 g of the PS suspension were found to be an ordered pore structure. The activities of the hollow spheres prepared using various amounts of the PS suspension for hydrolytic dehydrogenation of ammonia borane were compared. The results showed that 10, 7, and 6 mL of hydrogen were evolved from the aqueous ammonia borane solution in about 40 min in the presence of the hollow spheres prepared using 40, 80, and 120 g of PS suspension, respectively. The homogeneous hollow spheres with an ordered pore structure showed the highest activity among all the hollow spheres. The amount of acid sites and the coordination number of aluminum active species were characterized using neutralization titration and solid-state 27 Al magic angle spinning nuclear magnetic resonance spectroscopy. The homogeneous hollow spheres with an ordered pore structure had high amount of acid sites and 4-coordinated aluminum species. The relative proportion of 4-coordinated aluminum species was related to the dispersion of aluminum species. These results indicate that the homogeneous hollow spheres with an ordered pore structure showed the high activity because of high amount of acid sites induced by the highly dispersed aluminum species.

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A portable hydrogen generation system: Catalytic hydrolysis of ammonia–borane

Cited by 263 publications

References 21 publications

Nanoporous Gold Catalyst for Direct Ammonia Borane Fuel Cells

Nanoporous Gold Catalyst for Direct Ammonia Borane Fuel Cells

Liquid‐Phase Chemical Hydrogen Storage: Catalytic Hydrogen Generation under Ambient Conditions

Influence of morphology of hollow silica–alumina composite spheres on their activity for hydrolytic dehydrogenation of ammonia borane

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