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Колосов, В. Н.

doi:10.1023/a:1026625110544

Cited by 8 publications

(6 citation statements)

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“…Nickel, which is one of the cheapest and most Earth-abundant elements, catalyzes the OER but rapidly corrodes in acid . Oxides containing nickel and tantalum are highly insulating, but their intermetallic alloys are metallic conductors and may therefore be considered as candidates for OER electrocatalysts. ,, Intermetallic alloys of tantalum with nickel, including Ni 2 Ta, have been widely explored for use as corrosion-resistant coatings. , Ni 2 Ta, which crystallizes in the MoSi 2 structure type, has Ni bonded to Ta in a square pyramidal geometry and Ta bonded to Ni in bicapped square antiprisms (Figure a). As is the case for many intermetallic compounds, the ordering of the atoms in the crystal structure and the directional bonding give rise to chemical and mechanical properties such as enhanced catalysis and corrosion resistance , that differ from their constituent metallic elements .…”

Section: Introductionmentioning

confidence: 99%

Intermetallic Ni₂Ta Electrocatalyst for the Oxygen Evolution Reaction in Highly Acidic Electrolytes

et al. 2018

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The identification of materials capable of catalyzing the oxygen evolution reaction (OER) in highly acidic electrolytes is a critical bottleneck in the development of many water-splitting technologies. Bulk-scale solid-state compounds can be readily produced using high-temperature reactions and therefore used to expand the scope of earth-abundant OER catalysts capable of operating under strongly acidic conditions. Here, we show that high temperature arc melting and powder metallurgy reactions can be used to synthesize electrodes consisting of intermetallic NiTa that can catalyze the OER in 0.50 M HSO. Arc melted NiTa electrodes evolve oxygen at a current density of 10 mA/cm for >66 h with corrosion rates 2 orders of magnitude lower than that of pure Ni. The overpotential required for pellets of polycrystalline NiTa to produce a current density of 10 mA/cm is 570 mV. This strategy can be generalized to include other first-row transition metals, including intermetallic FeTa and CoTa systems.

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Section: Introductionmentioning

confidence: 99%

Intermetallic Ni₂Ta Electrocatalyst for the Oxygen Evolution Reaction in Highly Acidic Electrolytes

et al. 2018

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“…Among these elements, there are no reported EL baths for the deposition of Sc, V, Zr, and Hf metals (note Scandium and Yttrium section, Titanium, Zirconium, and Hafnium section, and Vanadium, Niobium, and Tantalum section). Ti/Zr alloy and Nb and Ta and their alloys have been deposited using active metal reducing agents like calcium or complex fluorides , in salt melts at high temperatures. Although V metal deposition has not been reported, EL deposition of its oxides using aqueous baths is known. , Within the elements of Groups 3–5, only two instances of deposition using aqueous baths have been reported to our knowledge to date.…”

Section: Discussionmentioning

confidence: 99%

“…The behaviors of Nb and Ta parallel those described for Ti and Zr. Specifically, EL plating of Nb or Ta or their alloys requires the use of active metal reducing agents like calcium or the generation of complex fluorides , in salt melts at high temperatures. In addition, Nb or Ta oxide particles added to aqueous EL metal baths can produce composites with desirable properties.…”

Section: Elementsmentioning

confidence: 99%

Electroless Metallization of the Elements: Survey and Progress

Turró

Dressick

2022

ACS Appl. Electron. Mater.

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The electroless plating of metals and their alloys, oxides, and chalcogenides represents a critically important technology for the automotive, aerospace, machine tools, and, especially, the electronics industries. Since the initial efforts involving the plating of industrially important metals, such as Ni, Co, Cu, Ag, and Au, in the mid-20th century, the process has evolved to encompass a growing number of elements. At the same time, this expansion in the palette of accessible metals has enabled progress in these industries and evoked new nonconventional applications. In this review, we collect and survey available electroless processes in aqueous and organic solvent systems for each element organized according to position in the Periodic Table as a resource for the reader. Examples illustrating progress in the field are presented and are described in sufficient detail to be useful and understandable for both the expert and nonexpert. Given the historical importance of electronics as a driver for development of electroless processes, examples are electronics-related where possible. However, we strive to also include examples of applications in nontraditional fields to provide the reader with a sense of generality available for electroless methods. The review closes with an outlook for the field and a challenge to scientists and engineers to adapt electroless processes for new applications to continue the growth of the field.

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Section: Earth-abundant Anode Materialsmentioning

confidence: 99%

“…Mondschein et al reported the intermetallic Ni2Ta for the OER in 0.5 M H2SO4 [218]. Intermetallic alloys are metallic conductors and Ni2Ta has been used as a corrosion resistance coating [219,220]. In their report, Mondschein et al found that arc-melted Ni2Ta rods combine the OER activity of Ni and the corrosion resistance of Ta and the intermetallic compound needed 980 mV to reach 10 mA/cm 2 (Figure 23b), a behavior assigned to the low electrochemically active surface area (EASA).…”

Section: Earth-abundant Anode Materialsmentioning

confidence: 99%

Earth-Abundant Electrocatalysts in Proton Exchange Membrane Electrolyzers

Sun

Fleischer

et al. 2018

Catalysts

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In order to adopt water electrolyzers as a main hydrogen production system, it is critical to develop inexpensive and earth-abundant catalysts. Currently, both half-reactions in water splitting depend heavily on noble metal catalysts. This review discusses the proton exchange membrane (PEM) water electrolysis (WE) and the progress in replacing the noble-metal catalysts with earth-abundant ones. The efforts within this field for the discovery of efficient and stable earth-abundant catalysts (EACs) have increased exponentially the last few years. The development of EACs for the oxygen evolution reaction (OER) in acidic media is particularly important, as the only stable and efficient catalysts until now are noble-metal oxides, such as IrOx and RuOx. On the hydrogen evolution reaction (HER) side, there is significant progress on EACs under acidic conditions, but there are very few reports of these EACs employed in full PEM WE cells. These two main issues are reviewed, and we conclude with prospects for innovation in EACs for the OER in acidic environments, as well as with a critical assessment of the few full PEM WE cells assembled with EACs.

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Cited by 8 publications

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Intermetallic Ni₂Ta Electrocatalyst for the Oxygen Evolution Reaction in Highly Acidic Electrolytes

Intermetallic Ni₂Ta Electrocatalyst for the Oxygen Evolution Reaction in Highly Acidic Electrolytes

Electroless Metallization of the Elements: Survey and Progress

Earth-Abundant Electrocatalysts in Proton Exchange Membrane Electrolyzers

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Cited by 8 publications

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Intermetallic Ni2Ta Electrocatalyst for the Oxygen Evolution Reaction in Highly Acidic Electrolytes

Intermetallic Ni2Ta Electrocatalyst for the Oxygen Evolution Reaction in Highly Acidic Electrolytes

Electroless Metallization of the Elements: Survey and Progress

Earth-Abundant Electrocatalysts in Proton Exchange Membrane Electrolyzers

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Intermetallic Ni₂Ta Electrocatalyst for the Oxygen Evolution Reaction in Highly Acidic Electrolytes

Intermetallic Ni₂Ta Electrocatalyst for the Oxygen Evolution Reaction in Highly Acidic Electrolytes