Electrospun CoCr7C3-supported C nanofibers: Effective, durable, and chemically stable catalyst for H2 gas generation from ammonia borane

Yousef, Ayman; Brooks, Robert; El-Halwany, M.M.; Abutaleb, Ahmed; El‐Newehy, Mohamed H.; Al‐Deyab, Salem S.; Kim, Hee Young

doi:10.1016/j.mcat.2017.02.036

Cited by 27 publications

(21 citation statements)

References 56 publications

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“…These emulsified water droplets often possess typical drop sizes ranging from 100 nm to few microns and inseparable using conventional techniques like gravity settling and cyclone separators. Polymeric nanofibers are of great interest in various applications such as catalysis [33,34], wound dressing [29], drug delivery [29], sensor technology [6] and filtration [35]. Nonwoven based superhydrophobic structures are often used as filter media, but not all hydrophobic surfaces interact with emulsified mixture to achieve effective separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effects of Surfactants on the Morphology and Properties of Electrospun Polyetherimide Fibers

Abutaleb

Lolla

Aljuhani³

et al. 2017

Fibers

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Electrospun fibers often have beads as byproducts. Bead formation can be substantially minimized by the introduction of additives, such as ionic salts or surfactants, to the electrospinning polymeric solution. Polyetherimide (PEI) fibers were fabricated using electrospinning. Four different additives, Lithium Chloride (LiCl), Sodium Chloride (NaCl), Triton X-100 and Hexadecyltrimethylammonium Bromide (HTAB) were utilized to alter the polymer solution electrical conductivity and surface tensions. The effects of solution conductivity and surface tension on the electrospinning and the thermal, mechanical stability of the polymeric fibers were investigated. Morphology, thermal properties, permeability and mechanical strength of the fiber mats were investigated using Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), Frazier Permeability Test, and Tensile tester respectively. The addition of 1.5wt.% HTAB was found to be the optimum concentration to produce PEI fibers without beads. The addition of HTAB produced fiber mats with higher air permeability, higher thermal stability and higher mechanical strength in comparison to the other additives. Finally, a filtration test was conducted on a simple custom model to compare the performance of beaded and non-beaded PEI fiber mats. The non-beaded PEI fiber mat performed better in terms of both separation efficiency (%E) and differential pressure drop (∆P) separating water droplets from diesel fuel.

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Section: Introductionmentioning

confidence: 99%

Effects of Surfactants on the Morphology and Properties of Electrospun Polyetherimide Fibers

Abutaleb

Lolla

Aljuhani³

et al. 2017

Fibers

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“…Furthermore, a peak can be observed at 2θ ~26°, representing an experimental d spacing of 3.37, which confirmed the presence of graphite-like carbon (d (002), PDF#; 41-1487). According to our previous studies, Ni NPs and its alloys have vital roles in the catalytic transformation of polymer NFs into graphite-like carbon during the calcination process [2,46,48,49]. These results suggested a successful formation of Cr 2 Ni 3 alloy NPs@CNFs.…”

Section: Resultsmentioning

confidence: 74%

“…However, a gradual decline was observed from the third cycle, reaching about 65% at the fifth cycle, demonstrating that the catalyst had a good reusability in the AB dehydrogenation at room temperature. The decline of catalytic activity may be attributed to the following: (1) the partial clustering of the metal NPs, (2) the increase of the solution viscosity, and (3) the passivation of the NFs’ surface, which was attributed to the accumulate boron products (e.g., metaborate) on the reaction solution and catalyst surface that inhibited the metal active sites [39,49].…”

Section: Resultsmentioning

confidence: 99%

Electrospun Bimetallic NiCr Nanoparticles@Carbon Nanofibers as an Efficient Catalyst for Hydrogen Generation from Ammonia Borane

et al. 2019

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In this study, we report on the fabrication and utilization of NiCr alloy nanoparticles (NPs)-decorated carbon nanofibers (CNFs) as efficient and competent non-precious catalysts for the hydrolytic dehydrogenation of ammonia borane (AB) at 25 ± 2 °C. The introduced NFs have been fabricated in one step using a high-temperature thermal decomposition of the prepared electrospun nanofiber mats (nickel acetate tetrahydrate, chromium acetate dimer, and polyvinyl alcohol) in an inert atmosphere. The chemical composition of the NFs with different proportions of Ni1−xCrx (x = 0.0, 0.1, 0.15, 0.2, 0.25, 0.3) was established via standard characterization techniques. These techniques proved the formation of disorder Cr2Ni3 alloy and carbon for all the formulations. The as-synthesized composite NFs exhibited a higher catalytic performance for AB dehydrogenation than that of Cr-free Ni–CNFs. Among all the formulations, the sample composed of 15% Cr shows the best catalytic performance, as more H2 was released in less time. Furthermore, it shows good stability, as it is recyclable with little decline in the catalytic activity after six cycles. It also demonstrates the activation energy, entropy (ΔS), and enthalpy (ΔH) with 37.6 kJ/mole, 0.094 kJ/mole, and 35.03 kJ/mole, respectively. Accordingly, the introduced catalyst has a lower price with higher performance encouraging a practical sustainable H2 energy application from the chemical hydrogen storage materials.

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“…Among ID nanostructures, nanofibers (NFs) have received particular consideration owing to their high surface area, high axial ratio, good mechanical properties, and exceptional physical properties [18,19,[29][30][31]. Moreover, compared to other nanostructures, NFs exhibit easy electron transfer, which can enhance the photodegradation process [18,32,33]. Electrospinning (ES) is the most common procedure for the production of NFs, owing to its ease, cost effectiveness, great yield, and efficiency [17,34,35].…”

Section: Introductionmentioning

confidence: 99%

Novel Low Temperature Route to Produce CdS/ZnO Composite Nanofibers as Effective Photocatalysts

et al. 2020

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In this work, CdS/ZnO composite nanofibers (NFs) were prepared by the electrospinning of a sol–gel comprised of poly(caprolactone), zinc acetate dihydrate, cadmium acetate dihydrate, and ammonium sulfide. The electrospun NF mats were calcined under vacuum in an argon (Ar) atmosphere at 200 °C for 1 h. Standard physiochemical analysis techniques demonstrated the formation of the crystalline hexagonal phase of CdS and ZnO. Composite NFs showed good photocatalytic degradation of methylene blue (MB) dye under visible light irradiation compared to their counterparts. CdS nanoparticles, ZnO nanofibers, and composite NFs photodegraded 35.5%, 47.3%, and 90% of the MB dye, respectively, within 100 min. The reaction kinetics of MB photodegradation using the composite NFs followed the pseudo-first-order relation. Owing to their facile preparation and good photodegradation ability, the proposed method can be used to prepare various photocatalysts for wastewater treatment.

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Electrospun CoCr7C3-supported C nanofibers: Effective, durable, and chemically stable catalyst for H2 gas generation from ammonia borane

Cited by 27 publications

References 56 publications

Effects of Surfactants on the Morphology and Properties of Electrospun Polyetherimide Fibers

Effects of Surfactants on the Morphology and Properties of Electrospun Polyetherimide Fibers

Electrospun Bimetallic NiCr Nanoparticles@Carbon Nanofibers as an Efficient Catalyst for Hydrogen Generation from Ammonia Borane

Novel Low Temperature Route to Produce CdS/ZnO Composite Nanofibers as Effective Photocatalysts

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