In this work, we report a facile route to fabricate a ZnCo2O4 nanosheet derived from metal-organic frameworks. The as-prepared ZnCo2O4 nanosheet material for lithium-ion batteries shows an excellent electrochemical performance. The obtained ZnCo2O4 nanosheet delivers a high reversible capacity of 1640.8 mA h g-1 at a current density of 100 mA g-1 after 50 cycles. More importantly, even at a current density of 1500 mA g-1, the electrode material still exhibits a discharge capacity of 581.3 mA h g-1 after 190 cycles. These results demonstrate that the ZnCo2O4 nanosheet shows great potential as an anode material for lithium ion batteries.
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http://dx.doi.org/10.1039/c8dt01129j | DOI Listing |
RSC Adv
November 2024
School of Materials Science and Engineering, Shenyang University of Technology Shenyang 110870 P. R. China
Electrode materials with excellent performance are the basis for designing supercapacitors with outstanding stability and high specific capacitance. In this work, we prepared a type of ZnCoO nanosheet structure with Ag nanoparticles through a multi-step hydrothermal strategy. The as-fabricated composite presented a specific capacity of 2540 F g at 1 A g due to the synergetic effect of its components and structure.
View Article and Find Full Text PDFThe synthesis and characterization of spinel cobalt-based metal oxides (MCoO) with varying 3d-transition metal ions (Ni, Fe, Cu, and Zn) were explored using a hydrothermal process (140 °C for two hours) to be used as alternative counter electrodes for Pt-free dye-sensitized solar cells (DSSCs). Scanning electron microscopy (SEM) and atomic force microscopy (AFM) revealed distinct morphologies for each metal oxide, such as NiCoO nanosheets, Cu CoO nanoleaves, Fe CoO diamond-like, and Zn CoO hexagonal-like structures. The X-ray diffraction analysis confirmed the cubic spinel structure for the prepared MCoO films.
View Article and Find Full Text PDFPhys Chem Chem Phys
May 2024
Department of Chemistry, University of Delhi, Delhi-110007, India.
The current work describes a facile synthesis of spinel-type ZnCoO along with an additional phase, CoO, by simply maintaining a non-stoichiometric ratio of Zn and Co precursors. Pure ZnCoO and CoO were also synthesized using the same method to compare results. The obtained morphologies of samples show that small-sized nanoparticles are interconnected and form a porous nanosheet-like structure.
View Article and Find Full Text PDFRSC Adv
January 2024
Department of Physics and Astronomy, University of North Carolina at Chapel Hill Chapel Hill NC 27599-3255 USA.
Controllable synthesis of electrode materials with desirable morphology and size is of significant importance and challenging for high-performance supercapacitors. Herein, we propose an efficient hydrothermal approach to controllable synthesis of hierarchical porous three-dimensional (3D) ZnCoO composite films directly on Ni foam substrates. The composite films consisted of two-dimensional (2D) nanosheets array anchored with one-dimensional (1D) nanowires.
View Article and Find Full Text PDFJ Colloid Interface Sci
November 2023
Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, China. Electronic address:
Transition metal oxides (TMOs) have received significant consideration. Because of their enormous theoretical capacity, cheap, and less toxicity. Notably, cobalt-based materials hold promises as negative electrode materials for batteries, but they suffer from less electrical conductivity and significant volume changes during operation.
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