Evaluation of Raney‐Nickel Cathodes Prepared with Aluminum Powder and Titanium Hydride Powder

Tanaka, Shin‐ichi; Hirose, Norimitsu; Tanaki, Toshiyuki

doi:10.1149/1.1391958

Cited by 18 publications

(6 citation statements)

References 10 publications

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“…However, since their results were worse than the materials tested in this work, and the conditions of the experiments were too different from our experiments (low electrolyte concentration or uncertain equilibrium potential correction), only some of their results were summarized in Table 1, Table 2 and Table 3. As found also by other authors [21,50,55,56,57,58,59], Ra-Ni showed the best performances. Nevertheless, there is still active research on cathodic materials and their synthesis, as it is perceived that improvements are still possible in order to provide lower overpotentials and cheaper catalysts [60].…”

Section: Resultssupporting

confidence: 83%

Non-Precious Electrodes for Practical Alkaline Water Electrolysis

2019

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Water electrolysis is a promising approach to hydrogen production from renewable energy sources. Alkaline water electrolyzers allow using non-noble and low-cost materials. An analysis of common assumptions and experimental conditions (low concentrations, low temperature, low current densities, and short-term experiments) found in the literature is reported. The steps to estimate the reaction overpotentials for hydrogen and oxygen reactions are reported and discussed. The results of some of the most investigated electrocatalysts, namely from the iron group elements (iron, nickel, and cobalt) and chromium are reported. Past findings and recent progress in the development of efficient anode and cathode materials appropriate for large-scale water electrolysis are presented. The experimental work is done involving the direct-current electrolysis of highly concentrated potassium hydroxide solutions at temperatures between 30 and 100 °C, which are closer to industrial applications than what is usually found in literature. Stable cell components and a good performance was achieved using Raney nickel as a cathode and stainless steel 316L as an anode by means of a monopolar cell at 75 °C, which ran for one month at 300 mA cm−2. Finally, the proposed catalysts showed a total kinetic overpotential of about 550 mV at 75 °C and 1 A cm−2.

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Section: Resultssupporting

confidence: 83%

Non-Precious Electrodes for Practical Alkaline Water Electrolysis

2019

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“…Porous nickel with a high surface area has been prepared from dealloying NiAl and NiZn alloys as a material for various applications. − In a recent example, porous nickel was prepared by the electrochemical formation of NiZn surface alloys followed by subsequent dealloying in zinc chloride−alkali chloride molten salts at 350−450 °C . It was believed that the high temperature was required to enhance the surface diffusion of nickel in order to obtain the desired interconnected porous structure.…”

Section: Introductionmentioning

confidence: 99%

Formation of Nanoporous Nickel by Selective Anodic Etching of the Nobler Copper Component from Electrodeposited Nickel−Copper Alloys

et al. 2008

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The preparation of nanoporous nickel films by electrochemical deposition of Ni-Cu alloy followed by the selective anodic etching of the less-active component (Cu) from the alloy was studied in an aqueous solution containing Cu(II) and Ni(II) at room temperature. Constant potential electrodeposition produced columnar Ni-Cu alloys, in which the Ni content increased as the deposition potential became more negative. X-ray diffraction and Auger mapping results indicate the presence of separated Cu-rich and Ni-rich phases in the alloys, with the Cu-rich phase being more concentrated in the middle of the column and surrounded by the Ni-rich phase. Cyclic voltammetric data indicates that anodic dissolution of nickel is retarded by passivation. By taking advantage of nickel passivation, selective anodic etching of copper from the Ni-Cu alloy produces nanohollow nickel tubes on indium-tin-oxide-coated glass substrates. The nanohollow tube structure obtained in this study is different from the interconnected bicontinuous nanopores that are usually obtained by dealloying the less noble component from a homogeneous solid solution alloy. The nanohollow tubes may have resulted from the fact that multiple phases columnar alloy deposits were produced by the electrodeposition step and from the limited mobility of nickel during the anodic etching step.

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“…[21][22][23] The HER is a critical reaction to produce hydrogen fuel from water electrolysis, which involves an electrochemical process to decompose water under a sufficient external voltage. [21][22][23] The HER is a critical reaction to produce hydrogen fuel from water electrolysis, which involves an electrochemical process to decompose water under a sufficient external voltage.…”

Section: Introductionmentioning

confidence: 99%

Templated fabrication of nanostructured Ni brush for hydrogen evolution reaction

Lin

Chiu

et al. 2010

J. Mater. Res.

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We fabricated a nanostructured brush by carrying out Ni deposition on a through-channel anodic aluminum oxide (AAO) template, followed by removal of the AAO skeleton. The AAO was prepared by a two-step anodization process resulting in pore diameter and thickness of 350 nm and 40 mm, respectively. Subsequently, the AAO underwent an electroless deposition involving sensitization, activation, and Ni plating, in conjunction with polyethylene glycol used as the inhibitor to prevent premature closing of pore opening. After deliberate control in relevant parameters, we obtained a conformal Ni overcoat along every pore channel leading to a reduced average pore diameter of 78 nm. Afterward, the sample was immersed in a KOH solution to remove the AAO structure, forming freestanding Ni tubules in a brush configuration. The nanostructured brush revealed considerable enhancement for hydrogen evolution reaction in both current-potential polarization and galvanostatic measurements, which were attributed to the increment in apparent surface area.

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Evaluation of Raney‐Nickel Cathodes Prepared with Aluminum Powder and Titanium Hydride Powder

Cited by 18 publications

References 10 publications

Non-Precious Electrodes for Practical Alkaline Water Electrolysis

Non-Precious Electrodes for Practical Alkaline Water Electrolysis

Formation of Nanoporous Nickel by Selective Anodic Etching of the Nobler Copper Component from Electrodeposited Nickel−Copper Alloys

Templated fabrication of nanostructured Ni brush for hydrogen evolution reaction

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