Registration Number
0222U000326,
0120U102247
, R & D reports
Title
Investigation of electrochemical structuring as a method of formation of innovative perspective nanomaterials on the basis of superalloys
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Head
Kublanovskii Valery S., Доктор хімічних наук
Registration Date
06-01-2022
Organization
V.I. Vernadskii Institute of General & Inorganic Chemistry NAS of Ukraine
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The chemical composition of electrolytes and electrolysis modes for the formation of dense coatings of double alloys 3d6-8 of the metal subgroup of iron with Mo, Re, Sn have been developed. The alloys "molybdenum-metals of the iron group" with a high content of molybdenum, which are electrodeposited from a highly saturated acetate-ammonia electrolyte, which can be used as promising electrodes for the reaction of hydrogen evolution (RBV). Smooth and non-cracked coatings with NiMo, CoMo and FeMo alloys were deposited at 30 mA * cm-2, at higher current densities the catalytic activity of the coating for RBV decreases slightly due to the formation of dense cracks on the surface. Alloys of MMo (M - Fe, Co, Ni) show a fairly high electrocatalytic activity in the hydrogen evolution reaction.
The study of electrodeposition of CoRe alloys from citrate and citrate-pyrophosphate electrolytes showed that the citrate electrolyte precipitates coatings containing up to 67 at.% Re with a current output of 20-40%, and the use of citrate-pyrophosphate electrolyte can increase the alloy current output, but the coating contains less rhenium - 13.5 at.%. CoRe alloys exhibit electrocatalytic activity of the hydrogen evolution reaction and allow to reduce by an order of magnitude the exchange current density and 220 mV overvoltage of hydrogen evolution compared to cobalt.
The specific and kinetic characteristics of electrolytic coatings with CoSn alloy, promising as high-energy anode materials for lithium-ion batteries, have been studied. It is shown that the coatings consist of densely packed spherulites, the size of which is from ~ 1 to ~ 5 μm. The discharge / charge curves of different samples are almost identical, which indicates the amorphous nature of the coatings. The found initial specific capacity is from 474 to 606 mA ∙ h ∙ g-1. It is shown that thin (up to 1 μm) CoSn films can efficiently cycle at high speeds, and their maximum discharge currents reach 20,000 mA ∙ g-1.
Product Description
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Babenkov Eugen A.
Bersirova Oksana L.
Devyatkin Sergei V.
Kochetova Svitlana A.
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
