Unlocking the potential of NiCo<sub>2</sub>O<sub>4</sub> nanocomposites: morphology modification based on urea concentration and hydrothermal and calcination temperature

Niyati, Ataollah; Moranda, Arianna; Basbus, Juan Felipe; Paladino, Ombretta

doi:10.1039/d4nj01581a

New J. Chem.

2024

DOI: 10.1039/d4nj01581a

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Unlocking the potential of NiCo₂O₄ nanocomposites: morphology modification based on urea concentration and hydrothermal and calcination temperature

Ataollah Niyati,

Arianna Moranda,

Juan Felipe Basbus

et al.

Abstract: Oxygen Evolution Reaction (OER) electrocatalysts are critical in minimizing energy loss during the anodic four-electron transfer process that is required for water oxidation. Improving and selecting optimal non-nobel OER electrocatalysts...

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Electrochemical Performance of a Hybrid NiCo2O4@NiFelt Electrode at Different Operating Temperatures and Electrolyte pH

Niyati,

Moranda,

Beigzadeh Arough

et al. 2024

Energies

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Transition metals such as nickel and cobalt as an alternative to Pt and Pd can be used for oxygen evolution reactions (OERs) and hydrogen production reactions (HERs) in alkaline environments, facilitating green hydrogen production as a sustainable alternative to fossil fuels. In this study, an NiCo2O4 catalyst was produced by a sono-hydrothermal method using urea as a hydrolysis agent. The electrochemical performance of the catalyst-coated NiFelt electrode was evaluated at different KOH concentrations (0.25, 0.5, and 1 M) and four operating temperatures in the interval of 20–80 °C. The electrode characteristics were investigated via electrochemical spectroscopy (cyclic voltammetry, EIS, multistep chronopotentiometry, multistep chronoamperometry) using two different reference electrodes (Ag/AgCl and Hg/HgO), to obtain insight into the anodic and cathodic peaks. XRD, SEM, EDS, and TEM analyses confirmed the purity, structure, and nanoscale particle size (20–45 nm) of the NiCo2O4 catalyst. The electrode showed symmetric CV with Ag/AgCl, making this reference electrode more appropriate for capacitance measurements, while Hg/HgO proved advantageous for EIS in alkaline solutions due to reduced noise. The overpotential of the catalyst-coated NiFelt decreased by 108 mV at 10 mA/cm2 compared to bare NiFelt, showing a good potential for its application in anion exchange membranes and alkaline electrolyzers at an industrial scale.

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Electrochemical Performance of a Hybrid NiCo2O4@NiFelt Electrode at Different Operating Temperatures and Electrolyte pH

Niyati,

Moranda,

Beigzadeh Arough

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

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Unlocking the potential of NiCo₂O₄ nanocomposites: morphology modification based on urea concentration and hydrothermal and calcination temperature

Abstract: Oxygen Evolution Reaction (OER) electrocatalysts are critical in minimizing energy loss during the anodic four-electron transfer process that is required for water oxidation. Improving and selecting optimal non-nobel OER electrocatalysts...

Cited by 1 publication

References 56 publications

Electrochemical Performance of a Hybrid NiCo2O4@NiFelt Electrode at Different Operating Temperatures and Electrolyte pH

Electrochemical Performance of a Hybrid NiCo2O4@NiFelt Electrode at Different Operating Temperatures and Electrolyte pH

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Unlocking the potential of NiCo2O4 nanocomposites: morphology modification based on urea concentration and hydrothermal and calcination temperature

Abstract: Oxygen Evolution Reaction (OER) electrocatalysts are critical in minimizing energy loss during the anodic four-electron transfer process that is required for water oxidation. Improving and selecting optimal non-nobel OER electrocatalysts...

Cited by 1 publication

References 56 publications

Electrochemical Performance of a Hybrid NiCo2O4@NiFelt Electrode at Different Operating Temperatures and Electrolyte pH

Electrochemical Performance of a Hybrid NiCo2O4@NiFelt Electrode at Different Operating Temperatures and Electrolyte pH

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Product

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Unlocking the potential of NiCo₂O₄ nanocomposites: morphology modification based on urea concentration and hydrothermal and calcination temperature