Published September 2021 | Version v1
Journal article Metadata-only

Electrochemical preparation of Ni(OH)2/CoOOH bilayer films for application in energy storage devices

Creators

  • 1. University Federal of Amazonas, Department of Chemistry, Manaus, AM (Brazil)
  • 2. University Federal of Amazonas, Department of Materials Engineering, Manaus, AM (Brazil)
  • 3. IFIMUP-IN, Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of Sciences of the University of Porto, 4169-007 Porto (Portugal)
  • 4. ISQ, Instituto de soldadura e qualidade, Av. Prof. Dr. Cavaco Silva, 2740-120 Porto (Portugal)
  • 5. Instituto de Física, Universidade de São Paulo, Rua do Matão 1371, 05508090 São Paulo, SP (Brazil)

Description

Highlights: • The preparation and electrochemical characterization of CoOOH/Ni(OH)2 and Ni(OH)2/CoOOH bilayer films is report. • The CoOOH layer in the CoOOH/Ni(OH)2 bilayer films result in a better electrochemical performance. • The relaxation time constant under this condition was 17.05 s • The CoOOH/Ni(OH)2 bilayer films might be a potential candidate for electrode applications. -- Abstract: CoOOH/Ni(OH)2 and Ni(OH)2/CoOOH bilayer films were obtained through electrochemical deposition of Ni(OH)2 and Co(OH)2 single layers onto steel plate substrate, with subsequent electrochemical oxidation of Co(OH)2 to form CoOOH. The films were structurally characterized using X-ray diffraction and Raman spectroscopy techniques. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy techniques were used to perform the electrochemical characterization of the prepared bilayers. It was verified that during the electrochemical oxidation, CoOOH formation occurs without Ni(OH)2 oxidation. Ni(OH)2 films deposited on CoOOH (CoOOH/Ni(OH)2) showed a superior electrochemical performance, with 324.27 mAhg−1 and 96.82% at 1.0 mA cm−2 for the specific capacity and capacity retention respectively. It was also determined that the relaxation time constant under this condition is 17.05 s. These results suggested that the CoOOH/Ni(OH)2 bilayer films might be potential candidates for application as electrode in energy storage devices.

Additional details

Identifiers

DOI
10.1016/j.jallcom.2021.159858;
PII
S0925838821012676;

Publishing Information

Journal Title
Journal of Alloys and Compounds
Journal Volume
874
Journal Page Range
vp.
ISSN
0925-8388
CODEN
JALCEU

INIS

Country of Publication
Switzerland
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
55033489
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S36: MATERIALS SCIENCE;
Descriptors DEI
APPLIANCES; CAPACITORS; COBALT HYDROXIDES; ELECTROCHEMISTRY; ELECTRODEPOSITION; ENERGY STORAGE; FILMS; LAYERS; NICKEL HYDROXIDES; NICKEL OXIDES; OXIDATION; RAMAN SPECTROSCOPY; RELAXATION TIME; X-RAY DIFFRACTION
Descriptors DEC
CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; COBALT COMPOUNDS; COHERENT SCATTERING; DEPOSITION; DIFFRACTION; ELECTRICAL EQUIPMENT; ELECTROLYSIS; EQUIPMENT; HYDROGEN COMPOUNDS; HYDROXIDES; LASER SPECTROSCOPY; LYSIS; NICKEL COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; SCATTERING; SPECTROSCOPY; STORAGE; SURFACE COATING; TRANSITION ELEMENT COMPOUNDS

Optional Information

Copyright
Copyright (c) 2021 Elsevier B.V. All rights reserved.