Synthesis of nanocrystalline Ni2B via a solvo-thermal route

Feng, Xin; Bai, Yu‐Jun; Lü, Bo; Zhao, Yu; Yang, Jie; Chi, J.Y.

doi:10.1016/j.inoche.2003.11.003

Cited by 16 publications

(12 citation statements)

References 16 publications

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“…As can be seen from this figure, the characteristic core level peak of nickel Ni 2p3/2 and Ni 2p1/2 were observed at 853 and 871 eV, respectively. The presence of the B 1 s peak at 190 eV was observed in the sample that are in good agreement with values of the literature 23,24 . O1s line was shown at 529 eV, This E b value is typical of oxygen involved in NiO 25 .…”

Section: Resultssupporting

confidence: 90%

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Synthesis of nickel boride and investigation of availability as an additive in the molten carbonate fuel cell anode material

Basarir

Özkan

2021

Intl J of Energy Research

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Summary Molten carbonate fuel cells are notable as clean energy systems and do not need pure hydrogen as fuel, and can use natural gas and hydrocarbons. Nickel boride is used as catalysts for hydrogenation reactions, because of its high micro‐hardness, chemical and thermal stability, selectivity and activity for liquid phase reactions. In this study, the positive effect of nickel boride as an additive in the anode material was investigated. Nickel boride was synthesised by chemical reduction with solvo‐thermal route. Reduction reaction of nickel chloride hexahydrate salt with sodium borohydride was performed for the nickel boride synthesis. Anode green sheets were prepared using the nickel boride additive with different rates (0%, 1%, 2% and 3%) by tape casting. Green sheets were subjected to sintering operation to get anode sheets. As a result of SEM analysis, increasing the nickel boride additive in the slurry caused to decrease in particle size and more homogeneous dispersion of the particles.

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Section: Resultssupporting

confidence: 90%

“…The presence of the B 1 s peak at 190 eV was observed in the sample that are in good agreement with values of the literature. 23,24 O1s line was shown at 529 eV, This Eb value is typical of oxygen involved in NiO. 25 The pollution carbon peak C1s was at 283 eV.…”

Section: Resultsmentioning

confidence: 93%

Synthesis of nickel boride and investigation of availability as an additive in the molten carbonate fuel cell anode material

Basarir

Özkan

2021

Intl J of Energy Research

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“…Two structures were considered for CO: 1/2 ML with CO at both top and bridge sites in a p (4 × 2) unit cell , and a lower 3/16 ML coverage with CO at the top sites in a p (4 × 4) unit cell . For the B 1s BEs, the following structures were considered: β-rhombohedral boron with an experimental lattice parameter of 10.13 Å and angle of 65.2 ° , tetragonal Co 2 B with optimized lattice parameters of 4.98 and 4.28 Å, tetragonal Ni 2 B with optimized lattice parameters of 4.99 and 4.28 Å, rhombohedral-BN with experimental lattice parameters of 2.50 and 9.99 Å, hexagonal-BN with experimental lattice parameters of 2.50 and 6.66 Å, cubic-BN with an optimized lattice parameter of 3.58 Å, and B 2 O 3 with optimized lattice parameters of 4.36 and 8.39 Å. In addition, a surface Co p4g clock boride growing from the step edges, boron at the B5 step sites, subsurface boron, and adsorbed BH with coverage of 1/9 ML at the hcp hollow site were included.…”

Section: Methodsmentioning

confidence: 99%

Evaluating the Structure of Catalysts Using Core-Level Binding Energies Calculated from First Principles

et al. 2013

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X-ray photoelectron spectroscopy (XPS) is a powerful and popular surface characterization technique, and the measured shifts in the core electron binding energies are sensitive to the chemical structure and local environment of the surface species. C 1s binding energies were calculated with density functional theory (DFT) for 17 structures including eight well-characterized structures on a Co(0001) surface and nine on a Pt(111) surface, while B 1s binding energies were calculated for six well-characterized structures and compared with experimental values. DFT calculations describe the 2.8 eV variation in the C 1s binding energies on Co surfaces, the 4.2 eV variation in the C 1s binding energies on Pt surfaces, and the 5.5 eV variation in the B 1s binding energies in the test sets with average deviations of 85, 73, and 53 meV, respectively. The shift in the C 1s and the B 1s binding energies can be correlated with the calculated charges, though only within homologous series. To illustrate how binding energy calculations can help elucidate catalyst structures, the nature of the resilient carbon species deposited during Fischer–Tropsch synthesis (FTS) over Co/γ-Al2O3 catalysts was studied. The catalysts were investigated using XPS after reaction, and the measured C 1s binding energies were compared with DFT calculations for various stable structures. The XPS peak at 283.0 eV is attributed to a surface carbide, while the peak at 284.6 eV is proposed to correspond to remaining waxes or polyaromatic carbon species. Boron promotion has been reported to enhance the stability of Co FTS catalysts. Again, the combination of XPS with DFT B 1s binding energy calculations helped identify the nature and location of the boron promoter on the Co/γ-Al2O3 catalyst.

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“…Ni 2 B is stable up to high pressures at ambient temperature [ 42 ] but is less amenable to solvo-thermal methods of synthesis. Feng et al [ 20 ] produced Ni 2 B at ~420 °C with 60% yield using benzene as the solvent. Other methods, such as with an RF thermal plasma produce Ni 2 B from Ni and B precursors but in a multi-phase mix with Ni 3 B and Ni 4 B 3 .…”

Section: Discussionmentioning

confidence: 99%

“…For example, Ni 3 B is synthesized at 1000 °C [ 4 ], Ni 2 B at 1200 °C [ 17 ] and Ni 4 B 3 at 750–900 °C [ 5 ]. Several other lower temperature methods have been suggested for synthesis of nickel boride compounds including ball milling of the elements [ 18 ], boronizing of pure nickel [ 19 ], and a solvo-thermal route [ 20 ]. Schlesinger et al [ 21 ] reported a simple synthesis of nickel boride using nickel salts and sodium borohydride, which results in the formation of a black precipitate with elemental ratios equivalent to Ni 2 B.…”

Section: Introductionmentioning

confidence: 99%

Single Step Process for Crystalline Ni-B Compounds

2018

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Crystalline Ni2B, Ni3B, and Ni4B3 are synthesized by a single-step method using autogenous pressure from the reaction of NaBH4 and Ni precursors. The effect of reaction temperature, pressure, time, and starting materials on the composition of synthesized products, particle morphologies, and magnetic properties is demonstrated. High yields of Ni2B (>98%) are achieved at 2.3–3.4 MPa and ~670 °C over five hours. Crystalline Ni3B or Ni4B3 form in conjunction with Ni2B at higher temperature or higher autogenous pressure in proportions influenced by the ratios of initial reactants. For the same starting ratios of reactants, a longer reaction time or higher pressure shifts equilibria to lower yields of Ni2B. Using this approach, yields of ~88% Ni4B3 (single phase orthorhombic) and ~72% Ni3B are obtained for conditions 1.9 MPa < Pmax < 4.9 MPa and 670 °C < Tmax < 725 °C. Gas-solid reaction is the dominant transformation mechanism that results in formation of Ni2B at lower temperatures than conventional solid-state methods.

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Synthesis of nanocrystalline Ni2B via a solvo-thermal route

Cited by 16 publications

References 16 publications

Synthesis of nickel boride and investigation of availability as an additive in the molten carbonate fuel cell anode material

Synthesis of nickel boride and investigation of availability as an additive in the molten carbonate fuel cell anode material

Evaluating the Structure of Catalysts Using Core-Level Binding Energies Calculated from First Principles

Single Step Process for Crystalline Ni-B Compounds

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