Registration Number
0222U000293,
0119U101639
, R & D reports
Title
Electrochemical synthesis of nanostructured superalloys with valuable electrochemical, electrocatalytic, corrosion properties
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Head
Kublanovskii Valery S., Доктор хімічних наук
Registration Date
05-01-2022
Organization
V.I. Vernadskii Institute of General & Inorganic Chemistry NAS of Ukraine
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The electrocatalytic activity of binary and ternary alloys of refractory metals with cobalt and nickel in the reaction of hydrogen evolution in acidic and alkaline solutions is determined. It is shown that NixRey binary alloys and CoxWyRez ternary alloys can be precipitated with polycrystalline or amorphous structure depending on the nature of the electrolyte (simple, complex), rhenium salt concentration (0.01 - 0.02 mol • l-1 KReO4), density of deposition current - 3.0 mA • cm-2) and temperature. The rhenium content can be regulated in a very wide range with the help of the listed parameters (10 - 98 at.%). The relationship between rhenium content and structure of alloys with electrocatalytic activity is found, the optimal composition of coatings and modes of their production are determined. It is shown that in KOH solution on ternary CoWRe alloys containing 10 - 20 at.% Re hydrogen overvoltage is reduced by 170 mV compared to cobalt coating, while hydrogen exchange current increases more than 15 times, and in solution 1.0 mol • l-1 H2SO4 show the greatest activity coatings containing 10 at.% Re, which reduce hydrogen overvoltage to 300 mV compared to the coating of pure Nickel.
The obtained coatings have good corrosion resistance, especially in the model corrosion solution NaCl - 4.5 kOhm • cm2, and in the KOH solution - 2.7 kOhm • cm2. It is established that for the two studied processes there are different criteria for obtaining the optimal result: for the electrocatalytic process it is the amount of refractory metals, and for corrosion protection, the crystal structure. Under both of these conditions, coatings are formed that are corrosion resistant and effective electrocatalysts.
Tin-cobalt alloy film coatings were formed, their electrochemical properties as anode materials of lithium-ion batteries (including specific capacity and cycling efficiency) depending on the deposition time and thickness of coatings and their phase composition and structure were stud
Product Description
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Babenkov Eugen A.
Bersirova Oksana L.
Devyatkin Sergei V.
Kochetova Svetlana
Kublanovsky Valerii S.
Mal'tseva Tetyana V.
Nikitenko Vasyl M.
Nechiporchuk Sergiy V.
Pisanenko Oleksandr D.
Yapontseva Juliya S.
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2022-03-09
