Electrochemical transformations of polymers formed from nickel (II) complexes with salen-type ligands in aqueous alkaline electrolytes

The polymeric nickel complexes with salen-type ligands can serve as useful materials for a range of applications, including catalytic systems and energy storage devices. Despite the fact that electrochemical properties of such complexes were investigated in detail in non-aqueous solutions, there has...

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Bibliographic Details
Published in:Electrochimica acta 2018-05, Vol.271, p.190-202
Main Authors: Kuznetsov, Nikita, Yang, Peixia, Gorislov, Georgy, Zhukov, Yuri, Bocharov, Vladimir, Malev, Valery, Levin, Oleg
Format: Article
Language:English
Subjects:
Alcohol
Alcohols
Aqueous electrolytes
Aqueous solutions
Catalysis
Catalytic activity
Coordination compounds
Electrocatalysis
Electrochemical analysis
Electrodes
Electrolytes
Electrooxidation
Energy storage
Ethanol
Inorganic chemistry
Ligands
Nickel
Nickel hydroxide
Oxidation
Salen-type complexes
Thin films
Transformations
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Summary:The polymeric nickel complexes with salen-type ligands can serve as useful materials for a range of applications, including catalytic systems and energy storage devices. Despite the fact that electrochemical properties of such complexes were investigated in detail in non-aqueous solutions, there has still remained scarce information about their behavior in aqueous systems. This work is devoted to studying such properties of poly[Ni(salen)] films in aqueous alkaline electrolytes. By combination of electrochemical methods with X-ray photoelectron and Raman spectroscopy it was shown that the redox transformations observed result in ligand exchange and formation of nickel hydroxide thin films deposited on the working electrodes. The obtained material consists of uniformly distributed nanoparticles with the characteristic size of about 10 nm. Catalytic activity of the produced modified electrodes in reactions of ethanol and methanol oxidation, as well as their ability to be charged and discharged reversibly for more than 1000 cycles, makes them promising materials for applications in catalytic and energy storage devices. •Hydrolysis of polymers formed from Ni complexes allows to obtain uniform coatings consisting of Ni(OH)2 nanoparticles.•The coating composition was confirmed by XPS and Raman spectroscopy.•Obtained materials demonstrate high catalytic activity in alcohol electrooxidation reaction in alkaline solutions.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.03.042