Hydrogen evolution at nickel sulphide cathodes in alkaline medium

Vandenborre, H.; Vermeiren, Ph.; Leysen, R.

doi:10.1016/0013-4686(84)87065-6

Cited by 115 publications

(35 citation statements)

References 5 publications

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“…This phenomenon also takes place in the case of alloys Ni-Mo-C, Co-W-C, and Ni-Fe-C [21][22][23][24]. Combining nickel, molybdenum or cobalt, and non-metals into semiconducting compounds Ni-S [25], CoSe [26], Mo-Se [26,27], and Mo-S [28] has been intensely investigated recently. It results from a low price of the metals and their wide accessibility while maintaining catalytic properties close to the platinum group of metals.…”

Section: Introductionmentioning

confidence: 98%

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

et al. 2017

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The aim of this work was to determine parameters of obtaining Co-B and Co-B-C alloys characterized by low overpotential in hydrogen evolution reactions. There were tests performed to examine the influence of borax and arginine concentration changes as well as the value of cathodic current intensity on the composition, morphology, synthesis current efficiency, and effectiveness of hydrogen evolution. Carbon was added to Co-B alloys to improve its properties of water decomposition in 8 M NaOH solution at 90°C. The results of the experiments confirmed a decrease in overpotential values from 48 mV/dec for Co-8.5B alloy to 33 mV/dec for Co-8.2B-9.6C alloy obtained at the highest concentration (0.1 M) of arginine in the electrolyte. It was observed that alloys of good catalytic properties featured an amorphous structure. The coatings were analyzed with the use of a scanning electron microscope (SEM) and X-ray diffraction (XRD). The content of boron was assessed based on the glow discharge spectroscopy (GDS) method, whereas carbon was analyzed with the method of adsorption spectroscopy of infrared radiation.

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Section: Introductionmentioning

confidence: 98%

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

et al. 2017

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“…The basic electrolyte used for electrodeposition was an aqueous solution consisting of 1 lysine was added to the electrodeposition solution as the carbon source. The pH of the electrodeposition solution was adjusted to 1.5 by addition of concentrated H 2 SO 4 .…”

Section: Methodsmentioning

confidence: 99%

“…Enhancement of cathodic activity of nickel and cobalt for electrolytic hydrogen evolution has been carried out by the formation of alloys such as Ni-S, 1) Raney Ni, 2) Ni-Mo, [3][4][5][6][7][8] Raney Ni-RuO, 2,9) Ni-Sn, 10) Ni-Mo-O, 11,12) Ni-Fe-C, 13,14) CoMo 15) and Co-Fe. 16) Among them, electrodeposited Ni-Fe-C alloys have the highest activity for hydrogen evolution in hot alkaline solutions and excellent durability: The overpotential for hydrogen evolution at the current density of 1000 Am À2 in 8 kmolÁm À3 NaOH at 90 C was less than 100 mV.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposited Co-Ni-Fe-C Alloys for Hydrogen Evolution in a Hot 8 kmol·m<SUP>−3</SUP> NaOH

et al. 2006

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Active cobalt alloy cathodes for hydrogen evolution in 8 kmolÁm À3 NaOH at 90 C was tailored by electrodeposition. Enhancement of cathodic activity of Co-Ni alloys was carried out by the formation of Co-Ni-Fe-C alloys. The addition of both iron and carbon was effective in enhancing the electrolytic hydrogen evolution activity, and the carbon addition was further effective in preventing preferential dissolution of iron and cobalt, that is, dealloying corrosion during shutdown period in the hot concentrated alkaline solution. The fcc Co-Ni-Fe-C alloys with about 15 at% iron showed the best performance with high hydrogen evolution activity and durability without dealloying corrosion. The alloys with high iron contents forming the bcc structure and showing sufficiently high activity without carbon addition suffered readily dealloying corrosion, and complete prevention of dealloying of the high iron alloys was not achieved by carbon addition.

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“…Enhancement of cathodic activity of nickel for electrolytic hydrogen evolution has been carried out by the formation of nickel alloys such as Ni-S, 1) Raney Ni, 2) Ni-Mo, [3][4][5][6][7][8] Raney Ni-RuO, 2,9) Ni-Sn, 10) Ni-Mo-O 11,12) and Ni-Fe-C. 13,14) Among them, electrodeposited Ni-Fe-C alloys showed the highest activity for hydrogen evolution in hot alkaline solutions and excellent durability: The overpotential for hydrogen evolution at the current density of 1000 Am À2 in 8 kmol m À3 NaOH at 363 K was less than 100 mV. The activity did not decrease and no iron dissolution occurred during open circuit immersion in the hot alkaline solution.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposited Co-Fe and Co-Fe-C Alloys for Hydrogen Evolution in a Hot 8 kmol m<SUP>-3</SUP> NaOH Solution

et al. 2003

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Tailoring of active cobalt alloy cathodes for hydrogen evolution in a hot concentrated sodium hydroxide solution was attempted by electrodeposition. Enhancement of cathodic activity of cobalt for electrolytic hydrogen evolution has been carried out by the formation of Co-Fe and Co-Fe-C alloys containing different content of iron. The carbon addition to Co-Fe alloys was made to enhance the electrolytic hydrogen evolution activity and to prevent open circuit corrosion in 8 kmol m À3 NaOH at 363 K. The best condition for electrodeposition of Co-Fe alloy was pH 4 and the iron sulfate concentration of more than 5 kg m À3 . Under this condition the alloy was obtained with nanocrystalline bcc phase as a dominant and with the highest hydrogen evolution activity. The carbon addition slowed down preferential iron dissolution by open circuit corrosion in the hot alkaline solution but was not effective in complete prevention of the open circuit corrosion and in enhancing the hydrogen evolution.

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Hydrogen evolution at nickel sulphide cathodes in alkaline medium

Cited by 115 publications

References 5 publications

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

Electrodeposited Co-Ni-Fe-C Alloys for Hydrogen Evolution in a Hot 8 kmol·m<SUP>−3</SUP> NaOH

Electrodeposited Co-Fe and Co-Fe-C Alloys for Hydrogen Evolution in a Hot 8 kmol m<SUP>-3</SUP> NaOH Solution

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Hydrogen evolution at nickel sulphide cathodes in alkaline medium

Cited by 115 publications

References 5 publications

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

Electrodeposition of Electroactive Co–B and Co–B–C Alloys for Water Splitting Process in 8 M NaOH Solutions

Electrodeposited Co-Ni-Fe-C Alloys for Hydrogen Evolution in a Hot 8 kmol&middot;m<SUP>&minus;3</SUP> NaOH

Electrodeposited Co-Fe and Co-Fe-C Alloys for Hydrogen Evolution in a Hot 8 kmol m<SUP>-3</SUP> NaOH Solution

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Electrodeposited Co-Ni-Fe-C Alloys for Hydrogen Evolution in a Hot 8 kmol·m<SUP>−3</SUP> NaOH