The formation of heterostructures by combining individual components (NiO and CoO) is a preferred approach to enhance electrochemical performance as it leads to improved charge transfer and surface reaction kinetics. In the present work, a NiO/CoO composite was prepared by two methods. First, neat NiO and CoO were prepared by adopting the hydrothermal method followed by the formation of the composite (i) by a hydrothermal route (NC-Hydro) and (ii) by a calcination route (NC-Cal). NC-Hydro composite shows a specific capacity of 176 C g at 1 A g of current density in the three-electrode system in a 2 M KOH solution as an electrolyte with 90% cyclic retention after 5000 cycles at 4 A g. NC-Cal shows a specific capacity of 111 C g at 1 A g with 75% cyclic retention. The coulombic efficiency of NC-Hydro was 86.3% while for NC-Cal it was 42.3%. The reason behind the superior electrochemical performance of NC-Hydro in comparison to NC-Cal may be the large interlayer spacing and lattice parameters of the former, which provide large space for redox reactions. The unit cell volume of the composites was more than that of the constituents. This study reveals that the composites prepared by the hydrothermal method have superior electrochemical properties in comparison to composites prepared by the calcination method.
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http://dx.doi.org/10.1039/d3ra05200a | DOI Listing |
J Colloid Interface Sci
January 2025
School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222000, PR China. Electronic address:
Metal-organic frameworks (MOFs) have shown significant potential in the photocatalytic activation of peroxydisulfate (PDS). Although many MOFs have been investigated for their ability to activate PDS, the impact of structural interpenetration on this process remains underexplored. In this study, MIL-88D(FeNi) and MIL-126(FeNi) were selected to systematically study this effect.
View Article and Find Full Text PDFSmall Methods
January 2025
Department of Physics, Tamkang University, Tamsui, 25137, Taiwan.
This investigation explores the potential of co-incorporating nickel (Ni) and cobalt (Co) into copper oxide (CuO) nanostructures for bifunctional electrochemical charge storage and oxygen evolution reactions (OER). A facile wet chemical synthesis method is employed to co-incorporate Ni and Co into CuO, yielding diverse nanostructured morphologies, including rods, spheres, and flake. The X-ray diffraction (XRD) and Raman analyses confirmed the formation of NiCo-CuO nanostructure, with minor phases of nickel oxide (NiO) and cobalt tetraoxide (CoO).
View Article and Find Full Text PDFJ Colloid Interface Sci
February 2025
Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China. Electronic address:
The renewable nature, high carbon content, and unique hierarchical structure of wood-derived carbon make it an optimal self-supporting electrode for energy storage. However, the limitations in specific surface area and electrical conductivity defects pose challenges to achieving satisfactory charge storage in wood-derived carbon electrodes. Therefore, exploring diverse and effective surface strategies is crucial for enhancing the electrochemical energy storage performance.
View Article and Find Full Text PDFACS Omega
September 2024
Catalytic and Plasma Process Engineering, Department of Chemical Engineering, McGill University, Montréal, Québec H3A 0C5, Canada.
Multiwalled carbon nanotubes find applications in many fields due to their extraordinary properties. However, depending on their synthesis method, they show no or a poor response to the presence of a magnetic field. This limits their usability in magnetic applications.
View Article and Find Full Text PDFACS Appl Mater Interfaces
October 2024
Department of Advanced Ceramics, Nagoya Institute of Technology, Gokiso, Showa, Nagoya, Aichi 466-8555, Japan.
Long-term durability and safety are required to develop Li-ion batteries that can operate at high voltages. However, side reactions, including the release of O from the electrode and CO from the organic electrolyte, occur at the positive-electrode/electrolyte interface during charging at high voltages. In this study, universal neural network potential (UNNP)-driven molecular dynamics (MD) calculations are used to investigate the mechanism of the reaction between LiCoO (0 ≤ ≤ 1) or LiNiO (0 ≤ ≤ 1), as the positive-electrode material, and an ethylene-carbonate-based electrolyte, with a solid-liquid interface composed of ∼1700 atoms.
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