Electrodeposits of iron and nickel-iron for hydrogen evolution in alkaline solutions

Carvalho, J. De; Tremiliosi‐Filho, Germano; Avaca, Luís Alberto; González, Ernesto Rafael

doi:10.1016/0360-3199(89)90049-9

Cited by 42 publications

(20 citation statements)

References 10 publications

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“…Previous works conducted in this laboratory [3,4] have shown that Ni-Fe codeposits, after activation by partial oxidation in acid medium, present an enhanced activity for the her in strongly alkaline solutions. In those works, Ni-Fe codeposits were electroplated on mild steel using different electrodeposition baths and evaluated for the her in both water and chlor-alkali electrolysers.…”

Section: Introductionmentioning

confidence: 97%

“…Nickel based electrodes are amongst the more active electrode materials for the her in alkaline solutions [1][2][3][4][5][6][7]. A combination of a large surface area with an enhanced catalytic activity, enables codeposits of Ni with other metals such as Co, Zn or Fe, to operate at overpotentials for the her close to 100 mV, well below the value of ~ 400 mV typically observed under industrial conditions [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical and physical characterization of Ni-Cu-Fe alloy for chlor-alkali hydrogen cathodes

Giz¹,

Marengo²,

Ticianelli³

et al. 2003

Eclet. Quím.

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This work describes the development of an alternative acetate bath for the electrochemical codeposition of Ni-Cu-Fe electrodes at low pH that is stable for several weeks and produces electrodes with good performance for chlor-alkali electrolysis. Physical characterization of the electrode surface was made using X ray absorption spectroscopy (XAS), scanning electron microscopy (SEM) and energy dispersive analysis (EDX). The evaluation of the material as electrocatalyst for the hydrogen evolution reaction (her) was carried out in brine solution (160 g L -1 NaCl + 150 g L -1 NaOH) at different temperatures through steady-state polarization curves. The Ni-Cu-Fe electrodes obtained with this bath have shown low overpotentials for the her, around 0.150 V at 353 K, and good stability under continuous long-term operation for 260 hours. One positive aspect of this cathode is that the polarization behavior of the material shows only one Tafel slope over the temperature range of 298 -353 K.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Electrochemical and physical characterization of Ni-Cu-Fe alloy for chlor-alkali hydrogen cathodes

Giz¹,

Marengo²,

Ticianelli³

et al. 2003

Eclet. Quím.

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“…One approach to enhance the electroactivity of Ni electrodes towards the HER is to form Ni-transition metal alloys, such as with Co, V, W, Fe, Mo, Zn and Cu [15][16][17][18][19][20][21][22][23][24][25] where the Ni-based alloy electrodes are fabricated by electrodeposition. The addition of the transition metal(s) is expected to alter the electrode reaction mechanism leading to a change in the activation energy of the HER [26].…”

Section: Introductionmentioning

confidence: 99%

Ni–Cu nano-crystalline alloys for efficient electrochemical hydrogen production in acid water

Nady

Negem

2016

RSC Adv.

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In this work, Ni, Cu and Ni-Cu nano-crystallins alloys were electrochemically deposited on a Cu electrode (Cu/Ni-Cu) by the galvanostatic technique and ultrasound waves in view of their possible applications as electrocatalytic materials for the hydrogen evolution reaction (HER). The obtained materials were characterized morphologically and chemically by XRD and scanning electron microscopy, SEM, coupled with EDX analysis. The HER activity of the prepared electrodes was studied in acidic media (0.5M H 2 SO 4 solution) by the polarization measurements and EIS technique. It was shown that the Ni-Cu alloy coatings electrodeposited possess high catalytic activity for hydrogen evolution in the acidic solutions. The electrocatalytic activity of the prepared electrodes depended on the morphology and the microstructure. Ni-Cu surfaces exhibited an enhanced catalysis for HER with respect to Ni and Cu cathode, which is mainly attributed to the high surface area of the developed electrode. Ni-Cu deposits with a Cu content of 49 at.% manifests the highest intrinsic activity for HER as a consequence of the synergetic combination of Ni and Cu. The experimental impedance data were fitted to theoretical data according to a proposed model for the electrode/electrolyte interface.The Ni-49%Cu nano-crystallins alloy showed higher HER activity than electrodeposited Ni because their nano-sized roughness results in a high surface area.

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“…From the slopes, the corresponding activation energies H, i.e. 22.7 kJ mol −1 , are calculated at 80 • C. Comparing with the values of other electrodes [15], 35 kJ mol −1 for Ni, 32 kJ mol −1 for electrodeposited Ni-Mo-Cd, 39 kJ mol −1 for Fe and 31 kJ mol −1 for electrodeposited Ni-Fe at the same temperature, the value for composite LaNi 5 /Ni-S alloy is much lower than them, which indicates that the composite LaNi 5 /Ni-S electrode is more active than the above electrodes. Table 3.…”

Section: Molten Salt Electrolysis Processmentioning

confidence: 99%

A study on the composite LaNi5/Ni–S alloy film used as HER cathode in alkaline medium

Han¹,

Chen²,

Liu³

et al. 2009

Journal of Alloys and Compounds

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Electrodeposits of iron and nickel-iron for hydrogen evolution in alkaline solutions

Cited by 42 publications

References 10 publications

Electrochemical and physical characterization of Ni-Cu-Fe alloy for chlor-alkali hydrogen cathodes

Electrochemical and physical characterization of Ni-Cu-Fe alloy for chlor-alkali hydrogen cathodes

Ni–Cu nano-crystalline alloys for efficient electrochemical hydrogen production in acid water

A study on the composite LaNi5/Ni–S alloy film used as HER cathode in alkaline medium

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