Synthesis of Ni/TiO2 catalyst by sol-gel method for hydrogen production from sodium borohydride

Dönmez, Fahriye; Ayas, Nezihe

doi:10.1016/j.ijhydene.2020.11.233

Cited by 31 publications

(18 citation statements)

References 41 publications

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Section: Resultssupporting

confidence: 89%

“…NaOH acts as a stabilizer to avoid the hydrolysis of NaBH 4 itself, and the rate of hydrogen generation from the hydrolysis of NaBH 4 moreover diminishes beneath more alkaline states. Similar conclusions were made in the experiments of Donmez F, 62 Guo et al 25 It has been reported that in the catalytic NaBH 4 hydrolysis process relying on the transfer of electrons, the coordination of 63 Therefore, hydrogen generation can be promoted when the solution is maintained in a certain alkalinity range. When the NaOH concentration in the solution is high, the surface of the NiCo nanosphere is covered by OH − and cannot better adsorb BH 4 − , thus affecting the hydrogen generation rate; at the same time, the high alkalinity reaction environment increases the viscosity of the solution, 34 causing the metal catalyst to be severely oxidized in the system, increasing the oxygen content in the catalyst and changing the active sites on the surface, which also prevents the byproduct NaBO 2 from rapid desorption on the catalyst surface, thus slowing down the process of hydrogen generation from substance exchange occurring on the catalyst surface.…”

Section: Phase Identification By Betsupporting

confidence: 86%

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2D/2D-Ni–Co–B/rGO Nanolayers Prepared by Galvanic Replacement for Hydrogen Generation through NaBH₄ Hydrolysis

Shi

Hou

et al. 2023

ACS Appl. Nano Mater.

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While non-precious metals like Co and Ni have shown good performance in generating hydrogen from NaBH 4 , the challenges of catalyst agglomeration and deactivation have become a focus of future research. To address this issue, in this study, Co nanoparticles on graphene carriers and controllably replaced with nickel atoms to form highly dispersed two-dimensional (2D)/2D Ni−Co nanolayers by Galvanic Replacement Reaction were prepared. Characterization analyses (transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and hydrogen temperatureprogrammed desorption (H 2 TPD)) suggested that 2D/2D Ni− Co nanolayer catalysts were observed with ultrathin nanolayer structures after using graphene as a carrier. In the hydrogen generation process, the Ni atoms as the main active centers, combined with the synergistic effect of Co and the good conductivity of graphene, contribute to improved hydrogen release. The 2D material showed good hydrogen generation performance, with a rate of 4300 mL•(min•g) −1 , maintenance of 94% hydrogen generating activity after five cycles, and lower activation energy of 29 kJ•mol −1 .

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Section: Resultssupporting

confidence: 89%

Section: Phase Identification By Betsupporting

confidence: 86%

2D/2D-Ni–Co–B/rGO Nanolayers Prepared by Galvanic Replacement for Hydrogen Generation through NaBH₄ Hydrolysis

Shi

Hou

et al. 2023

ACS Appl. Nano Mater.

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“…As seen in Figure 10 B and the Arrhenius equation (Equation (4)), Ea = 35.21 kJ mol-1 was found. The literature reports activation energies for non-noble metals ranging from 16.28 to 42.45 kJ mol −1 [ 73 , 74 , 75 , 76 , 77 ]. The obtained E a value was compared with the E a values of various Co-based catalysts and catalysts supported on polymer substrate.…”

Section: Resultsmentioning

confidence: 99%

Electrospun Co Nanoparticles@PVDF-HFP Nanofibers as Efficient Catalyst for Dehydrogenation of Sodium Borohydride

et al. 2023

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Metallic Co NPs@poly(vinylidene fluoride-co- hexafluoropropylene) nanofibers (PVFH NFs) were successfully synthesized with the help of electrospinning and in situ reduction of Co2+ ions onto the surface of PVFH membrane. Synthesis of PVFH NFs containing 10, 20, 30, and 40 wt% of cobalt acetate tetrahydrate was achieved. Physiochemical techniques were used to confirm the formation of metallic Co@PVFH NFs. High catalytic activity of Co@PVFH NFs in the dehydrogenation sodium borohydride (SBH) was demonstrated. The formulation with 40 wt% Co proved to have the greatest performance in comparison to the others. Using 1 mmol of SBH and 100 mg of Co@PVFH NFs, 110 mL of H2 was produced in 19 min at a temperature of 25 °C, but only 56, 73, and 89 mL were produced using 10, 20, and 30 wt% Co, respectively. With the rise of catalyst concentration and reaction temperature, the amount of hydrogen generated increased. By raising the temperature from 25 to 55 °C, the activation energy was lowered to be 35.21 kJ mol−1 and the yield of H2 generation was raised to 100% in only 6 min. The kinetic study demonstrated that the reaction was pseudo-first order in terms of the amount of catalyst utilized and pseudo-zero order in terms of the SBH concentration. In addition, after six cycles of hydrolysis, the catalyst showed outstanding stability. The suggested catalyst has potential applications in H2 generation through hydrolysis of sodium borohydride due to its high catalytic activity and flexibility of recycling.

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“…The catalytic activities of the catalysts were investigated on the NaBH 4 hydrolysis using the experimental setup given in our previous study [18,19]. Briefly, the reaction was performed in a 250 mL flask.…”

Section: Activity Testmentioning

confidence: 99%

Investigation of Hydrogen Production from Sodium Borohydride in the Presence of Ni/Al₂O₃

Dönmez

Kiren²,

Ayas³

2022

IOP Conf. Ser.: Earth Environ. Sci.

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With the increasing trend towards the use of renewable energy and the encouragement of international agreements due to environmental effects, the world tends to provide the energy it needs from renewable sources. Hydrogen is an environmentally friendly energy carrier that is produced from various energy sources and can be a sustainable solution to energy needs. Catalyst evaluation studies are carried out in studies that release high purity hydrogen by hydrolysis of metal hydrides such as sodium borohydride (NaBH4), and potassium borohydride (KBH4). In this study, Al2O3 supported Ni catalysts were synthesized by the impregnation method and the catalysts were characterized by applying X-Ray Diffractometry (XRD), X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET) methods. The performance of the catalysts was evaluated in the production of hydrogen by the hydrolysis of sodium borohydride. The influences of reaction temperature (20, 40, and 60 °C) and Ni content of the catalyst (20, 30, and 40 %) on the hydrolysis reaction was investigated under experimental conditions of 100 mg NaBH4, 100 mg catalyst, 5 mL 0.25 M NaOH. The highest hydrogen yield (100%) and hydrogen production rate (364.3 mL/gcat.min) was obtained with 40% Ni/Al2O3 catalyst at 60 °C reaction temperature.

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Synthesis of Ni/TiO2 catalyst by sol-gel method for hydrogen production from sodium borohydride

Cited by 31 publications

References 41 publications

2D/2D-Ni–Co–B/rGO Nanolayers Prepared by Galvanic Replacement for Hydrogen Generation through NaBH₄ Hydrolysis

2D/2D-Ni–Co–B/rGO Nanolayers Prepared by Galvanic Replacement for Hydrogen Generation through NaBH₄ Hydrolysis

Electrospun Co Nanoparticles@PVDF-HFP Nanofibers as Efficient Catalyst for Dehydrogenation of Sodium Borohydride

Investigation of Hydrogen Production from Sodium Borohydride in the Presence of Ni/Al₂O₃

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Synthesis of Ni/TiO2 catalyst by sol-gel method for hydrogen production from sodium borohydride

Cited by 31 publications

References 41 publications

2D/2D-Ni–Co–B/rGO Nanolayers Prepared by Galvanic Replacement for Hydrogen Generation through NaBH4 Hydrolysis

2D/2D-Ni–Co–B/rGO Nanolayers Prepared by Galvanic Replacement for Hydrogen Generation through NaBH4 Hydrolysis

Electrospun Co Nanoparticles@PVDF-HFP Nanofibers as Efficient Catalyst for Dehydrogenation of Sodium Borohydride

Investigation of Hydrogen Production from Sodium Borohydride in the Presence of Ni/Al2O3

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2D/2D-Ni–Co–B/rGO Nanolayers Prepared by Galvanic Replacement for Hydrogen Generation through NaBH₄ Hydrolysis

2D/2D-Ni–Co–B/rGO Nanolayers Prepared by Galvanic Replacement for Hydrogen Generation through NaBH₄ Hydrolysis

Investigation of Hydrogen Production from Sodium Borohydride in the Presence of Ni/Al₂O₃