Electrochemical performance of hydrogen evolution reaction of Ni–Mo electrodes obtained by mechanical alloying

Rodríguez-Valdéz, Luz María; Estrada-Guel, I.; Almeraya-Calderón, Facundo; Neri-Flores, M.A.; Martínez‐Villafañe, A.; Martı́nez-Sánchez, R.

doi:10.1016/j.ijhydene.2003.11.005

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…Here it should be mentioned, that only the content of the metallic phase was taken into account for the evaluation regardless of the ambiguous values of oxygen and other light elements detected by the EDS analysis. in comparison with previous works reported for Ni-Mo alloys obtained from aqueous electrolytes and is close to that found for Ni-Mo alloys prepared by metallurgical [11] or mechanical alloying techniques [49]. In order to reveal the interdependencies between bath chemistry and applied current densities, partial current densities (PSD) for Ni PCD , Mo PCD reduction and hydrogen evolution were also evaluated based on Faraday's law (Table 2).…”

Section: Design Of Mo-rich Alloys Coatingssupporting

confidence: 83%

Design of Highly Active Electrodes for Hydrogen Evolution Reaction Based on Mo-Rich Alloys Electrodeposited from Ammonium Acetate Bath

et al. 2019

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The given research was driven by prospects to design Mo-rich coatings with iron group metals electrodeposited from a highly saturated ammonium acetate bath. The obtained coatings could be employed as prominent electrodes for the hydrogen evolution reaction (HER). It was found that the Mo content in Ni–Mo alloys can be tuned from 30 to 78 at.% by decreasing the molar ratio [Ni(II)]:[Mo(VI)] in the electrolyte from 1.0 to 0.25 and increasing the cathodic current density from 30 to 100 mA/cm2. However, dense cracks and pits are formed due to hydrogen evolution at high current densities and that diminishes the catalytic activity of the coating for HER. Accordingly, smoother and crack-free Ni–54 at.% Mo, Co–52 at.% Mo and Fe–54 at.% Mo alloys have been prepared at 30 mA/cm2. Their catalytic behavior for HER has been investigated in a 30 wt.% NaOH solution at temperatures ranging from 25 to 65 °C. A significant improvement of electrocatalytic activity with increasing bath temperature was noticed. The results showed that the sequence of electrocatalytic activity in alkaline media decreases in the following order: Co–52 at.% Mo > Ni–54 at.% Mo > Fe–54 at.% Mo. These peculiarities might be linked with different catalytic behavior of formed intermetallics (and active sites) in electrodeposited alloys. The designed electrodeposited Mo-rich alloys have a higher catalytic activity than Mo and Pt cast metals.

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Section: Design Of Mo-rich Alloys Coatingssupporting

confidence: 83%

Design of Highly Active Electrodes for Hydrogen Evolution Reaction Based on Mo-Rich Alloys Electrodeposited from Ammonium Acetate Bath

et al. 2019

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“…The overpotential at a given current density is another important parameter characterizing the apparent electrode activity. − The values of the overpotential at a current density of 10 mA cm –2 (η 10 ) recorded for the tested catalysts (Table ) decrease markedly, thus favoring H 2 generation with high cathodic currents at lower overpotentials, in comparison with that of the bare Al electrode (535 mV). Here again, an Al-5% TiO 2 NP composite catalyst recorded the lowest η 10 (112 mV) among the studied composite catalysts (292, 145, and 220 mV for Al-1% TiO 2 NP, Al-3% TiO 2 NP, and Al-10% TiO 2 NP catalysts, respectively).…”

Section: Results and Discussionmentioning

confidence: 99%

Aluminum Titania Nanoparticle Composites as Nonprecious Catalysts for Efficient Electrochemical Generation of H₂

Amin

Ahmed

Mostafa

et al. 2016

ACS Appl. Mater. Interfaces

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In this paper, we demonstrated, for the first time, aluminum titania nanoparticle (Al-TiO2 NP) composites with variable amounts of TiO2 NPs as nonprecious active catalysts for the electrochemical generation of H2. These materials were synthesized by mixing desired amounts of hydrogen titanate nanotubes (TNTs), fabricated here by a cost-effective approach at moderate hydrothermal conditions, with aluminum powder (purity 99.7%; size 35 μm). The mixture was compacted under an applied uniaxial stress of 300 MPa followed by sintering at 500 °C for 1 h. After sintering had been completed, all TNTs were found to convert to TiO2 NPs (average particle size 15 nm). Finally, Al-xTiO2 NP nanocomposites (x = 1, 3, 5, and 10) were obtained and characterized by scanning electron microscopy/energy-dispersive X-ray, X-ray diffraction, and X-ray photoelectron spectroscopy. The hydrogen evolution reaction (HER) activity of these materials was studied in 0.5 M H2SO4 at 298 K using polarization and impedance measurements. The nanocomposite of chemical composition Al-5% TiO2 NPs showed the best catalytic performance for the HER, with an onset potential (EHER), a Tafel slope (βc), and an exchange current density (j0) of -100 mV (RHE), 59.8 mV decade(-1), and 0.14 mA cm(-2), respectively. This HER activity is not far from that of the commercial platinum/carbon catalyst (EHER = 0.0 mV, βc = 31 mV dec(-1), and j0 = 0.78 mA cm(-2)). The best catalyst also exhibited good stability after 10000 repetitive cycles with negligible loss in current.

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“…The 1980s again saw intensive studies of NiMo electrocatalyst layers [24] and surfaces were prepared by thermal decomposition followed by hydrogen reduction [34,44,45], electrodeposition of NiMo layers [65e67] sometimes as a NiMoCd alloy as this gave a high surface area [67], ball milling of Ni and Mo nanopowders to form alloy particles followed by pressing to give an electrode [68,69] and low pressure plasma spraying of NiAlMo alloy powders followed by leaching [70e72]. The papers by Brown et al [44,45] suggest that their alloy coating prepared by thermal decomposition and reduction contained 13% Mo.…”

Section: à2mentioning

confidence: 99%

Prospects for alkaline zero gap water electrolysers for hydrogen production

Pletcher

2011

International Journal of Hydrogen Energy

305

193

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Electrochemical performance of hydrogen evolution reaction of Ni–Mo electrodes obtained by mechanical alloying

Cited by 13 publications

References 8 publications

Design of Highly Active Electrodes for Hydrogen Evolution Reaction Based on Mo-Rich Alloys Electrodeposited from Ammonium Acetate Bath

Design of Highly Active Electrodes for Hydrogen Evolution Reaction Based on Mo-Rich Alloys Electrodeposited from Ammonium Acetate Bath

Aluminum Titania Nanoparticle Composites as Nonprecious Catalysts for Efficient Electrochemical Generation of H₂

Prospects for alkaline zero gap water electrolysers for hydrogen production

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Electrochemical performance of hydrogen evolution reaction of Ni–Mo electrodes obtained by mechanical alloying

Cited by 13 publications

References 8 publications

Design of Highly Active Electrodes for Hydrogen Evolution Reaction Based on Mo-Rich Alloys Electrodeposited from Ammonium Acetate Bath

Design of Highly Active Electrodes for Hydrogen Evolution Reaction Based on Mo-Rich Alloys Electrodeposited from Ammonium Acetate Bath

Aluminum Titania Nanoparticle Composites as Nonprecious Catalysts for Efficient Electrochemical Generation of H2

Prospects for alkaline zero gap water electrolysers for hydrogen production

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Product

Resources

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Aluminum Titania Nanoparticle Composites as Nonprecious Catalysts for Efficient Electrochemical Generation of H₂