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Wang, Rong; Lu, Zhengqian; Ko, T.

doi:10.1023/a:1012578002418

Cited by 15 publications

(15 citation statements)

References 7 publications

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“…This is in contradiction to what was earlier observed by XRD in Al-Ni alloys produced by the melt-spinning technique where the presence of an Al phase was not considered in the analysis of the experimental results [6][7][8]. However, a very detailed investigation of the published diffraction patterns reveals small bumps at scattering angles where the Al peaks are to show up.…”

Section: Discussioncontrasting

confidence: 94%

“…Different processing routes, such as multilayer coatings [2], direct spraying [3,4], rapid solidification [5][6][7][8], ball-milling [9,10], different kinds of chemical activation [11,12] as well as impulse [13] and gas atomisation [1], have recently been used to produce new alloys that after leaching are, or might be, more efficient in catalysis processes and/or fuel cell applications than the ones obtained by ingot grinding. Out of the above-mentioned techniques gas atomisation has been selected as the most promising one in order to produce Al-Ni based powders suitable to obtain an efficient Ni catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…Narrow grain size ranges have to be obtained by screening. Several studies on the catalytic efficiency of Al-Ni based alloys have recently been published [6][7][8][14][15][16] and are discussed in detail in [17].…”

Section: Introductionmentioning

confidence: 99%

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Structural characterisation of Al–Ni powders produced by gas atomisation

Bao

Dahlborg

Adkins

et al. 2009

Journal of Alloys and Compounds

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Section: Discussioncontrasting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Structural characterisation of Al–Ni powders produced by gas atomisation

Bao

Dahlborg

Adkins

et al. 2009

Journal of Alloys and Compounds

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“…In precursor alloys containing Ni 2 Al 3 phase it has been reported that the Ni 2 Al 3 phase does not leach properly and is still present in the final catalyst [18][19][20]. This would therefore confuse interpretation of results.…”

Section: Resultsmentioning

confidence: 99%

Atomistic simulation of the nano-structural evolution of Raney-type catalysts from spray-atomized NiAl precursor alloys during leaching with NaOH solution

Barnard¹,

Brown²,

Devred³

et al. 2009

Simulation of Electrochemical Processes III

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A model for the nano-structural evolution of Raney-type nickel catalysts (widely used in hydrogenation reactions) from the constituent intermetallic phases present in nickel-aluminium precursor alloys is presented here. Nano-porous nickel catalysts are prepared via a caustic leaching process where the NiAl alloy powder (typically 50-50 at.%) is immersed in concentrated NaOH solution in order to leach away the aluminium present to leave a highly-porous nickel catalyst (often referred to as spongy nickel).The temporal evolution of the nickel catalyst is described by a kinetic Monte Carlo (kMC) method, which captures two dominant processes taking place on leaching with NaOH solution: rapid aluminium dissolution from the crystalline intermetallic phases and surface adatom diffusion of nickel and aluminium. Structural changes from NiAl 3 and Ni 2 Al 3 phases present in the starting alloy are considered on an event-by-event basis. Individual crystallite size, pore diameter and effective surface area are predicted. Finally, a Metropolis Monte Carlo method is used to investigate the surface nature of the as-leached catalyst and compared to concurrent experimental investigations.

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“…Raney Nickel is porous structure of Ni (size of pores less than 5 nm) produced by leaching out Al from a Ni-Al alloy. There is no report for producing fibers of Raney Ni and all reports are related to powder or bulk coating of Raney Ni [13][14][15][16][17]. In this paper, the relationship between length, width, thickness and density of the Tapes (number/𝑐𝑚 2 ) with OER overpotential and new sight for developing OER catalysts are discussed.…”

Section: Introductionmentioning

confidence: 96%

Production of a new 3D electrode skeleton of Ni with very high electrochemical surface area for oxygen evolution

Fakourihassanabadi

Guay

2021

Preprint

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Long and stable fibers (Tapes) of nickel with a thickness that can reach less than one hundred nanometers were produced through directional solidification of Ni-Al hypereutectic alloy on the surface of Ni and then, leaching the alloy in potassium hydroxide solution. Experimental results illustrated that the structure of the tapes is Raney nickel. In other words, a 3D structure consisting of a large number of Nano-dimensional tapes with a Nano-porous and Nano-crystalline structure was created. The activity of this structure was evaluated for oxygen evolution in alkaline media. The results showed that by increasing the number of Tapes per 〖cm〗^2 (density of Tapes), electrochemical surface area and double layer capacitance increase. As the density of Tapes increases, the OER overpotential decreases, but with further increase in density of Tapes, the OER overpotential increases again. Re-increase in overpotential was associated to trapping of oxygen bubbles. The best sample showed an overpotential 240 mV at 10 mA/〖cm〗^2 and 350 mV at 500 mA/〖cm〗^2. Also, this sample worked without any sign of degradation at 500 mA/〖cm〗^2 for 6 days (144 hours).

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Untitled

Cited by 15 publications

References 7 publications

Structural characterisation of Al–Ni powders produced by gas atomisation

Structural characterisation of Al–Ni powders produced by gas atomisation

Atomistic simulation of the nano-structural evolution of Raney-type catalysts from spray-atomized NiAl precursor alloys during leaching with NaOH solution

Production of a new 3D electrode skeleton of Ni with very high electrochemical surface area for oxygen evolution

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