The stability of NiCoZn electrocatalyst for hydrogen evolution activity in alkaline solution during long-term electrolysis

Solmaz, Ramazan; Döner, Ali; Şahin, İrem; Yüce, Ayşe Ongun; Kardaş, Gülfeza; Yazıcı, Birgül; Erbil, M.

doi:10.1016/j.ijhydene.2009.07.086

Cited by 81 publications

(34 citation statements)

References 31 publications

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“…[171][172][173][174][175][176][177] Ir x Ru y Ta z O 2 as an anode electrocatalyst achieved an overall cell voltage of 1.57 V at 1 A cm −2 at 80 °C, with an energy consumption of 3.75 kWh N m −3 H 2 and efficiency of 94%, for a total noble metal loading of less than 2.04 mg cm −2 . 47 However, there are some non-noble, less expensive metals that also present electrocatalytic activity and are being introduced for use in oxygen [178][179][180][181][182][183][184][185] and hydrogen 165,166,[186][187][188][189][190][191] evolution reactions. Additionally, during designing an electrode, it is normally doped or coated with more stable and active layers.…”

Section: Future Trendsmentioning

confidence: 99%

Hydrogen production by alkaline water electrolysis

Santos¹,

Sequeira²,

Figueiredo³

2013

Quím. Nova

389

226

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Recebido em 13/12/12; aceito em 28/5/13; publicado na web em 17/7/13Water electrolysis is one of the simplest methods used for hydrogen production. It has the advantage of being able to produce hydrogen using only renewable energy. To expand the use of water electrolysis, it is mandatory to reduce energy consumption, cost, and maintenance of current electrolyzers, and, on the other hand, to increase their efficiency, durability, and safety. In this study, modern technologies for hydrogen production by water electrolysis have been investigated. In this article, the electrochemical fundamentals of alkaline water electrolysis are explained and the main process constraints (e.g., electrical, reaction, and transport) are analyzed. The historical background of water electrolysis is described, different technologies are compared, and main research needs for the development of water electrolysis technologies are discussed.

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Section: Future Trendsmentioning

confidence: 99%

Hydrogen production by alkaline water electrolysis

Santos¹,

Sequeira²,

Figueiredo³

2013

Quím. Nova

389

226

View full text Add to dashboard Cite

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“…These treatments promote a partial leaching of Zn producing a porous electrode of high surface area. After the leaching process, the working electrode was held at 100 mA cm -2 cathodic current density in 1 M KOH solution for 30 min to reduce the oxide film on the electrode surface as well as removal of corrosion products from the pores of coating and to obtain reproducible electrode surface characteristics [25].…”

Section: Methodsmentioning

confidence: 99%

Preparation, characterization, and application of alkaline leached Ni/Zn–Ni binary coatings for electro-oxidation of methanol in alkaline solution

2012

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The Ni-Zn binary coating was electrochemically deposited on a copper electrode. Then, it was etched in a concentrated alkaline solution (30 wt% NaOH) to obtain a porous electrocatalytic surface suitable for methanol electro-oxidation in alkaline solution. The surface compositions of coatings before and after alkaline leaching were determined by atomic absorption spectroscopy and energy dispersive X-ray analysis. The surface morphologies were investigated by scanning electron microscopy. It was found that the leached Ni-Zn coating has a porous structure. Electrocatalytic activity toward the methanol electro-oxidation was assessed by cyclic voltammetry and electrochemical impedance spectroscopy techniques. The activation of electrode related to the removal of existing corrosion products and formation of pores and cracks during alkaline leaching. Cyclic voltammetry studies confirmed that the alkaline leaching process improved the activity of Ni-Zn coating in comparison with smooth Ni deposit for the methanol electro-oxidation.

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“…Electrodes based on electrodeposited NiCoZn [18] showed better stability during studies. These electrodes were synthesized by electrodeposition of Ni, Co, Zn, on a Cu substrate followed by a leaching stage in NaOH, producing a compact porous structure.…”

Section: Raney Nickel and Its Alloys As A Catalytic Materialsmentioning

confidence: 98%