Thermal hydrolysis of solid-state sodium borohydride for noncatalytic hydrogen generation

Kim, Geo Jong; Hwang, Hyun Tae

doi:10.1016/j.cej.2021.130445

Cited by 20 publications

(6 citation statements)

References 49 publications

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“…The hydrogen yield of 5.00 wt % at a temperature of 50 °C is a better result than a previous result which was obtained by the use of SB and boric acid. 43 The detailed calculation for determining the hydrogen yield is as follows…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The hydrogen yield determined from eq increased slightly from 4.85 to 5.00 wt % as the OA component in the composite increased from 50 to 75 wt %. The hydrogen yield of 5.00 wt % at a temperature of 50 °C is a better result than a previous result which was obtained by the use of SB and boric acid . The detailed calculation for determining the hydrogen yield is as follows where the exact volume of the produced hydrogen gas (mL) is equal to the final pressure of the reactor (in absolute pressure) multiplied by the reactor volume (44.6 mL) divided by 101.325 kPa, which is further converted into the weight of hydrogen by multiplying by the hydrogen density at the final temperature of the reactor, for example, 75.1 μg mL –1 at 50 °C, 65.3 μg mL –1 at 100 °C, and 57.8 μg mL –1 at 150 °C.…”

Section: Resultsmentioning

confidence: 99%

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Heat-Induced Dry Hydrolysis of Sodium Borohydride/Oxalic Acid Dihydrate Composite for Hydrogen Production

et al. 2021

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The generation of hydrogen, free of poisonous gas, combined with a lightweight proton-exchange membrane fuel cell can expand the use of hydrogen energy from conventional ground transportation vehicles and power stations to a variety of flying vehicles and wearable devices for civilian and military purposes. Herein, a hydrogen fuel composite composed of sodium borohydride (SB) and oxalic acid dihydrate (OA·2H2O) is introduced. The SB/OA·2H2O composite was easily decomposed to generate pure hydrogen at a trigger temperature of 50 °C, at which the water molecules of the OA·2H2O component were effectively liberated, inducing hydrolysis of the SB component to produce hydrogen gas. This dry hydrolysis-based hydrogen generation using the SB/OA·2H2O composite has the merits of rapidly generating hydrogen (i.e., 0.4 g of the composite can be fully decomposed within a minute at low temperatures), free of poisonous gas, in approximately 5 wt % yield (the theoretical maximum value).

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Heat-Induced Dry Hydrolysis of Sodium Borohydride/Oxalic Acid Dihydrate Composite for Hydrogen Production

et al. 2021

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“…Chemical hydrides such as ammonia borane (AB/NH 3 BH 3 ) have been widely explored as hydrogen storage mediums for low-temperature energy conversion in fuel cells. − On the other hand, limited efforts have been made − on investigating the energy generation capability of these compounds for propulsion systems, which demand extremely high-energy release rates. − Elemental metals and metalloids, particularly boron (B), possess high oxidative energy density and are, therefore, attractive as fuel components in solid-state energy dense materials for propulsion systems . During the oxidation process of B nanoparticles, a molten oxide shell grows from the surface to the core of the particle, while core B is still in the solid state. , The liquid oxide shell presents a significant barrier to oxygen diffusion, which severely limits the reactivity of particulate B .…”

Section: Introductionmentioning

confidence: 99%

Catalytic Cleavage of the Dative Bond of Ammonia Borane by Polymeric Carbonyl Groups for Enhanced Energy Generation

et al. 2023

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Dissociation of the dative (B–N) bond of ammonia borane (NH3BH3/AB) is essential to prevent its thermochemical oligomerization to chemically resistant BNH x compounds, for its applicability as a fuel in high-energy propulsion systems. We show that when AB is incorporated into polymer matrices containing carbonyl functional groups, thermal activation causes the carbonyl groups to engage in nucleophilic interactions with AB. Such interactions catalyze the lysis of the dative B–N bond resulting in the decomposition of AB to NH3 and B2H6 gases, with no evidence of oligomerization. We find that the carbonyl groups function as catalysts and do not participate in any net reaction. In situ high-heating rate (∼105 K/s) characterizations demonstrate that facile-synthesized hierarchical (micro/nano) composite particles of AB/carbonyl-based polymers completely gasify to NH3 and B2H6 at ∼510 K, followed by spontaneous ignition in the air with negligible delay. Thus, the current chemical pathway enables the solid-state storage of reactive fuels, NH3 and B2H6, and their controlled on-demand release for high-energy applications.

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“…Combustion of fossil fuels produces toxic gases (e.g., carbon dioxide, nitrous oxide, etc.) that deteriorate the ecological environment [ 1 , 2 , 3 ]. Thus, the search for alternative and sustainable energy has become urgent worldwide.…”

Section: Introductionmentioning

confidence: 99%

CuNi Alloy NPs Anchored on Electrospun PVDF-HFP NFs Catalyst for H2 Production from Sodium Borohydride

Abutaleb

2023

Polymers

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Non-noble CuxNi1−x (x = 0, 0.1, 0,2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1) alloy nanoparticles supported on poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) nanofibers (NFs) are successfully fabricated. The fabrication process is executed through an electrospinning technique and in situ reduction in Cu2+ and Ni2+ salts. The as-synthesized catalysts are characterized using standard physiochemical techniques. They demonstrate the formation of bimetallic NiCu alloy supported on PVDF-HFP. The introduced bimetals show better catalytic activity for sodium borohydride (SBH) hydrolysis to produce H2, as compared to monometallic counterparts. The Cu0.7 Ni0.3/PVDF-HFP catalyst possesses the best catalytic performance in SBH hydrolysis as compared to the others bimetallic formulations. The kinetics studies indicate that the reaction is zero order and first order with respect to SBH concentration and catalyst amount, respectively. Furthermore, low activation energy (Ea = 27.81 kJ/mol) for the hydrolysis process of SBH solution is obtained. The excellent catalytic activity is regarded as the synergistic effects between Ni and Cu resulting from geometric effects over electronic effects and uniform distribution of bimetallic NPs. Furthermore, the catalyst displays a satisfying stability for five cycles for SBH hydrolysis. The activity has retained 93% from the initial activity. The introduced catalyst has broad prospects for commercial applications because of easy fabrication and lability.

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Thermal hydrolysis of solid-state sodium borohydride for noncatalytic hydrogen generation

Cited by 20 publications

References 49 publications

Heat-Induced Dry Hydrolysis of Sodium Borohydride/Oxalic Acid Dihydrate Composite for Hydrogen Production

Heat-Induced Dry Hydrolysis of Sodium Borohydride/Oxalic Acid Dihydrate Composite for Hydrogen Production

Catalytic Cleavage of the Dative Bond of Ammonia Borane by Polymeric Carbonyl Groups for Enhanced Energy Generation

CuNi Alloy NPs Anchored on Electrospun PVDF-HFP NFs Catalyst for H2 Production from Sodium Borohydride

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