Cobalt/Chromium Nanoparticles-Incorporated Carbon Nanofibers as Effective Nonprecious Catalyst for Methanol Electrooxidation in Alkaline Medium

Mohamed, Ibrahim M.A.; Motlak, Moaaed; Fouad, H.; Barakat, Nasser A.M.

doi:10.1142/s1793292016500491

Cited by 31 publications

(7 citation statements)

References 49 publications

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“…The formed gases reduced the salt and metal oxides to form pure Ni and Cr and/or their alloys rather than their oxides [2]. The formation of Ni and Cr can be defined by the following reactions [44,45]:Ni(CH 3 COO) 2 ·4H 2 O → 0.86Ni(CH 3 COO) 2 0.14 Ni(OH) 2 + 3.72 H 2 O + 0.28 CH 3 COOH…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…The nanofibrous morphology of the sintered electrospun NF mats was not affected by the high calcination temperature. This may be attributed to the polycondensation of the NiAc and CrAc with PVA [3,20,44,46]. Figure 1c,d shows the sintered NFs obtained after the abnormal calcination of electrospun NF mats composed of NiAc/CrAc/PVA.…”

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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“…The doped-Cd C NPs in the graphite shell prepared by Abdelkareem with the sol-gel method had enhanced catalytic activity for MOR, and its current density was 70 mA/ cm 2 , the initial potential was 600 mV (NHE), [118] which indicated that it was conducive to the MOR. In this study, [119] doped-Co Cr 7 C 3 nanorods inset with carbon nanofibers were used as a new low-cost and high-efficiency catalyst (using the sol-gel method). The material's morphology was studied and the result showed lattice fringes' distance was 0.221 nm, which was the intermediate value of Co and Cr 7 C 3 , semblable distributions of Co, Cr, and C were found, showing the stable orthogonal structure of CoCr 7 C 3 -CNFs [147] and the carbon coverage of Co and Cr 7 C 3 facilitated their catalytic activity for MOR.…”

Section: Sol-gel Methodsmentioning

confidence: 99%

“…It is lower than the value measured under CoCr 7 C 3 -CNFs nanocomposite (65 mA/cm 2 ). Mohamed et al [119] modified CoÀ Cr NPs on carbon nanofibers. Compared with CoCr 7 C 3 -CNFs nano-composites, methanol oxidation reaction (+ 320 mV (Ag/AgCl)) was also detected a positive starting value.…”

Section: Other Transition Metal Catalystsmentioning

confidence: 99%

Research Progress on Catalysts for the Electrocatalytic Oxidation of Methanol

Ding

Dong

Tang³

2020

ChemistrySelect

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The methanol oxidation reaction has high energy density and the product is non-toxic and harmless (CO 2 , H 2 O), making it become one of the targets of new fuel energy. To maximize the efficiency of the reaction, its key lies in the development of highly efficient catalysts. In this paper, we reviewed the types of methanol electrocatalytic oxidation catalysts in recent years, some new preparation methods, and the reaction mechanism of different types of catalyst systems, and discussed their structure-activity relationships, laying the foundation for the development of highly efficient new catalysts in the future. And this paper is included on the types of catalysts (Pt-based catalyst, Ni-based catalyst, and other transition metal-based catalyst) and preparation methods (Reduction method, sol-gel method, in-situ method), and discussed the catalytic mechanism which mainly starts from two aspects, one is adsorptiondesorption, the other is the bond between the catalyst, methanol, and the medium. Finally, the future challenges and opportunities of the electrocatalytic oxidation of methanol are discussed.

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“…Electrochemical experiments including CV, CA and EIS were achieved by Potentiostat/ Galvanostat/ZRA Gamry instrument. The electrochemical studies were investigated according to the 3-electrode system as reported before 22,23 . The measurements were repeated to test the reproducibility of the results.…”

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confidence: 99%

A facile chemical synthesis of CuxNi(1−x)Fe2O4 nanoparticles as a nonprecious ferrite material for electrocatalytic oxidation of acetaldehyde

Khalaf

El‐Lateef

Alnajjar

et al. 2020

Sci Rep

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In the present work, Cu-doped nickel ferrite (Cu x ni (1−x) fe 2 o 4) nanoparticles (cunfnps) were chemically fabricated by adding citric acid as a capping agent followed by combustion and calcination for acetaldehyde oxidation reaction (AOR) in KOH electrolytes. The as-prepared CuNFNPs were studied in terms of Fourier-transform infrared spectroscopy (FT-IR), Transmission electron microscopy (TEM), Field emission scanning electron microscope (FE-SEM), Energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) specific surface area analyses. The morphology of CuNFNPs has sponges-structure containing irregular pores. Additionally, XRD analysis indicated that the prepared CuNFNPs have a cubic-crystals ferrite without the existence of impurities and the crystal size around 20.2 nm. The electrooxidation of acetaldehyde by the presented CuNFNPs was investigated using cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (eiS) in − OH media. Furthermore, the effects of − OH and acetaldehyde on the electrocatalytic performance were studied with and without Cu-doping in addition to EIS and CA studies which confirm the high-performance of cunfnps as an electrocatalyst for AoR. Electrocatalytic degradation of aldehydes which have the highest potential among the volatile organic compounds continues to be one of the interesting research points because it can be utilized for different catalytic industrial application areas 1. Aldehydes including acetaldehyde can be produced through alcohol electrooxidation besides the degradation of contaminated organic compounds 2. It's a combustion intermediate of biofuels and fossil fuels and biofuels 3. Due to aldehydes emission ability to the outer atmosphere, it is important to remove aldehydes before its emission. Electrocatalytic oxidation can be applied and considered as one of the best techniques because of low-operating temperature, and energy consumption. In spite of the reported literature, the research on the acetaldehyde electrooxidation remains far from commercialization. Compared to ethanol, methanol, formic acid, and urea, the acetaldehyde electrooxidation reaction (AOR) was scarcely reported in the literature 4,5. Therefore, this study focusses on the AOR at the surface of novel and non-precious material. Acetaldehyde (CH 3-CH=O) is the simplest structure having CC species with different polarity and, as such, may be easily studied as a model for the investigation of CC bond cleavage. Therefore, it would be worth studying how the aldehydes compounds which may produce as intermediates in fuel cells could be oxidized to CO 2. The AOR has similar intermediates of ethanol (CH 3-CH 2 OH) electrooxidation which is the anodic process of ethanol fuel cells (EFCs), i.e. CH 3 CO (ads) , CH x(ads) and CO (ads) 4,6. These intermediates can finally produce acetic acid and/ or CO 2. Therefore, the investigation of AOR appears to have a high potential in the process of EFCs. The utilized electrocatalyst for AOR ...

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Cobalt/Chromium Nanoparticles-Incorporated Carbon Nanofibers as Effective Nonprecious Catalyst for Methanol Electrooxidation in Alkaline Medium

Cited by 31 publications

References 49 publications

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

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

Research Progress on Catalysts for the Electrocatalytic Oxidation of Methanol

A facile chemical synthesis of CuxNi(1−x)Fe2O4 nanoparticles as a nonprecious ferrite material for electrocatalytic oxidation of acetaldehyde

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