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ELECTROLYTIC GLUCOSE OXIDATION ON COMPOSITE MOLYBDENUM-CONTAINING COBALT COATINGS

Authors: Nenastina, Tatiana O.; D. Sakhnenko, Mykola; Proskurina, Valeria O.;

ELECTROLYTIC GLUCOSE OXIDATION ON COMPOSITE MOLYBDENUM-CONTAINING COBALT COATINGS

Abstract

Electrodeposition of refractory metals and zirconium in composite alloys with cobalt allows to obtain coatings with a unique combination of physicochemical properties that are unachievable while using other methods of covering. The coatings deposited by pulsed current can be considered as composite materials the oxide phase for which is formed directly in the electrode process as an intermediate of incomplete reduction of tungstates and hydrolysis of zirconium (IV) salts. It was found that oxygen and carbon are included in the composition of the coatings as well as the main components, thus such systems can be considered as composite. The topography of the films is distinguished by the presence of elliptical and spherical grains with crystallite sizes of 80 - 180 nm. On the surface of the coatings, there are hills (large grains) with a diameter of 1 - 3 μm. The anodic glucose oxidation on composite-coated electrodes has been studied and the participation of the intermediate metal oxides in the oxygen transfer has been revealed. Triple cobalt and refractory metal (Mo, W, Zr) alloy coatings were deposited from pyrophosphate –citrate electrolytes in the pulsed mode. Cyclic voltamperograms show that the Co-Mo-ZrО2 alloys are characterized by the highest stability during the anode polarization due to the zirconium and molybdenum oxides added to their composition. 

Електроосадження композиційних покриттів кобальтом з тугоплавкими металами дозволяє отримувати покриття з унікальним поєднанням фізико-хімічних властивостей, недосяжних при використанні інших методів нанесення. Покриття, осаджені із застосуванням імпульсного струму, можна вважати композиційними матеріалами, оксидна фаза для яких утворюється безпосередньо в електродному процесі як інтермедіат неповного відновлення вольфраматів та гідролізу солей цирконію. Встановлено, що поряд з основними компонентами до складу покривів включаються оксиґен та карбон, і такі системи можуть розглядатися як композиційні. Топографія плівок відрізняється наявністю зерен еліптичної і сферичної форми з розмірами кристалітів 80 – 180 нм. На основній поверхні зустрічаються виступи (крупні зерна) діаметром 1 – 3 мкм. Досліджено анодне окиснення глюкози на електродах з композиційним покриттями і виявлено участь проміжних оксидів металів в перенесенні оксигену. Покриття потрійними сплавами кобальту з тугоплавкими металами (Mo, W, Zr) осаджені з пірофосфатно-цитратних електролітів в імпульсному режимі. Циклічні вольтамперограми показують, що сплави Co-Mo-ZrО2 характеризуються найвищою стабільністю при анодній поляризації завдяки включенню до їх складу оксидів цирконію і молібдену.

Keywords

композиційні покриття, електролітічне осадження, кобальт, тугоплавкі метали, каталітичні матеріали, composite coatings, electrochemical deposition, cobalt, refractory metals, catalytic materials

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold