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   Morphology and performance of CoOOH films synthesized via electrochemical oxidation: substrate effects  
   
نویسنده Lianet Aguilera ,Priscila Carvalho Machado Aguiar ,Yurimiler Leyet ,Eduardo Padrón-Hernández ,Raimundo Ribeiro Passos ,Leandro Aparecido Pocrifka
منبع journal of solid state electrochemistry - 2018 - دوره : 22 - شماره : 12 - صفحه:3845 -3852
چکیده    in the present work, coooh films are synthesized from the electrochemical oxidation of α-co(oh)2 as precursor. the substrate influences on the material electrochemical properties are studied. the samples are structural and morphologically characterized using techniques of x-ray diffraction (xrd) and scanning electronic microscopy (sem). the cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques are used for the electrochemical characterization. the films deposited on steel substrate grew in the vertical hexagonal platelet form. meanwhile, films on ti plate presented morphology in agglomerated sphere form. after electrochemical oxidation, the film initial morphology is maintained. the films deposited on steel plate have a structure which favors charge storage showing a high specific capacity value (110.92 ma h g−1) and cyclic stability of 92% after 1000 cycles. finally, the relaxation time constant value calculated was 5.6 s. this fact is making this material as a possible good candidate for application as electrode material or additive for other materials, in energy storage devices.
کلیدواژه Cobalt oxyhydroxide ,Electrochemical oxidation ,Substrate influence
آدرس Federal University of Amazonas, Department of Chemistry, Laboratory of Electrochemistry and Energy, Brazil, Federal University of Amazonas, Department of Chemistry, Laboratory of Electrochemistry and Energy, Brazil, Federal University of Amazonas, Department of Materials Engineering, Brazil, Federal University of Pernambuco, Department of Physic, Brazil, Federal University of Amazonas, Department of Chemistry, Laboratory of Electrochemistry and Energy, Brazil, Federal University of Amazonas, Department of Chemistry, Laboratory of Electrochemistry and Energy, Brazil
 
     
   
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