Abstract:A MOF is employed as a template and carbon resource for the synthesis of porous carbon-coated CuCo2O4 concave polyhedra, exhibiting an excellent capacity and cycling reversibility.
“…S5) 3, 4, 48 . Moreover, the high irreversible capacity loss can also be attributed to the volume variations, some undecomposed Li 2 O phase, along with the irreversible reduction of active materials and electrolyte during the first discharge process 11, 64–66 . Notably, the curves are strongly overlapped for 25, 50 and 100 cycles, suggesting the good stability and reversibility of CuFeO 2 @rGO electrode.Figure 4( a ) CV curves of CuFeO 2 @rGO.…”
Section: Resultsmentioning
confidence: 99%
“…Therefore, searching for new anode materials with ultrahigh theoretical capacity and remarkable electrochemical performance is urgently required 8, 9 , due to the low theoretical capacity for the current commercial graphite anodes 10 . Considerable researches have been devoted to the design of transition metal oxides (TMOs) based electrodes including the binary, ternary, and complex metal oxides, for application in high-performance energy storage devices 11–18 . Among TMOs, the ternary oxides with delafossite structure (ABO 2 ) and spinel structure (AB 2 O 4 ) have unique layered crystal structures with three-dimensional diffusion pathways, which are benefit for lithium ion insertion and extraction 19–23 .…”
Copper ferrites are emerging transition metal oxides that have potential applications in energy storage devices. However, it still lacks in-depth designing of copper ferrites based anode architectures with enhanced electroactivity for lithium-ion batteries. Here, we report a facile synthesis technology of copper ferrites anchored on reduced graphene oxide (CuFeO2@rGO and Cu/CuFe2O4@rGO) as the high-performance electrodes. In the resulting configuration, reduced graphene offers continuous conductive channels for electron/ion transfer and high specific surface area to accommodate the volume expansion of copper ferrites. Consequently, the sheet-on-sheet CuFeO2@rGO electrode exhibits a high reversible capacity (587 mAh g−1 after 100 cycles at 200 mA g−1). In particular, Cu/CuFe2O4@rGO hybrid, which combines the advantages of nano-copper and reduced graphene, manifests a significant enhancement in lithium storage properties. It reveals superior rate capability (723 mAh g−1 at 800 mA g−1; 560 mAh g−1 at 3200 mA g−1) and robust cycling capability (1102 mAh g−1 after 250 cycles at 800 mA g−1). This unique structure design provides a strategy for the development of multivalent metal oxides in lithium storage device applications.
“…S5) 3, 4, 48 . Moreover, the high irreversible capacity loss can also be attributed to the volume variations, some undecomposed Li 2 O phase, along with the irreversible reduction of active materials and electrolyte during the first discharge process 11, 64–66 . Notably, the curves are strongly overlapped for 25, 50 and 100 cycles, suggesting the good stability and reversibility of CuFeO 2 @rGO electrode.Figure 4( a ) CV curves of CuFeO 2 @rGO.…”
Section: Resultsmentioning
confidence: 99%
“…Therefore, searching for new anode materials with ultrahigh theoretical capacity and remarkable electrochemical performance is urgently required 8, 9 , due to the low theoretical capacity for the current commercial graphite anodes 10 . Considerable researches have been devoted to the design of transition metal oxides (TMOs) based electrodes including the binary, ternary, and complex metal oxides, for application in high-performance energy storage devices 11–18 . Among TMOs, the ternary oxides with delafossite structure (ABO 2 ) and spinel structure (AB 2 O 4 ) have unique layered crystal structures with three-dimensional diffusion pathways, which are benefit for lithium ion insertion and extraction 19–23 .…”
Copper ferrites are emerging transition metal oxides that have potential applications in energy storage devices. However, it still lacks in-depth designing of copper ferrites based anode architectures with enhanced electroactivity for lithium-ion batteries. Here, we report a facile synthesis technology of copper ferrites anchored on reduced graphene oxide (CuFeO2@rGO and Cu/CuFe2O4@rGO) as the high-performance electrodes. In the resulting configuration, reduced graphene offers continuous conductive channels for electron/ion transfer and high specific surface area to accommodate the volume expansion of copper ferrites. Consequently, the sheet-on-sheet CuFeO2@rGO electrode exhibits a high reversible capacity (587 mAh g−1 after 100 cycles at 200 mA g−1). In particular, Cu/CuFe2O4@rGO hybrid, which combines the advantages of nano-copper and reduced graphene, manifests a significant enhancement in lithium storage properties. It reveals superior rate capability (723 mAh g−1 at 800 mA g−1; 560 mAh g−1 at 3200 mA g−1) and robust cycling capability (1102 mAh g−1 after 250 cycles at 800 mA g−1). This unique structure design provides a strategy for the development of multivalent metal oxides in lithium storage device applications.
“…[71] Zhang et al reported a way to directly grow ZnO@ZnO quantum dots/C core-shell nanorod arrays (NRAs) on a flexible carbon cloth substrate based on a facile and scalable in situ ion exchange process (Figure 1a). [76] Tang et al reported synthesizing a carbon-coated Li 4 Ti 5 O 12 (LTO/C) composite through the direct pyrolysis of a Li-doped Ti-MOF precursor in N 2 at 800 and 900 °C, denoted as LTO/C-800 and LTO/C-900, respectively. The as-prepared products showed a remarkable rate capability and high cycling performance.…”
batteries, sodium-selenium (Na-Se) batteries, Li-tellurium (Li-Te) batteries, and Na-S batteries) have their own distinctive applications due to their various characteristics. To explore new materials with high performance, large studies have been devoted to the development of nextgeneration batteries.Porous carbon (PC) materials possess many unique properties due to their large surface areas, high conductivity, large pore volumes, high thermal stability, and surface functionalities, [22][23][24] leading to their wide use in energy storage and conversion. Traditionally, PC can be obtained via various methods, such as the direct heat treatment of organic precursors, hard template or nanocast methods, and soft template methods. However, the production of PC from these methods cannot be scaled-up because of certain barriers (disordered structure with wide size distributions, complicated processes, etc.). [23,25,26] Metal-organic frameworks (MOFs) have drawn wide research interest as a novel class of porous materials that are crystalline materials consisting of metal ions and organic ligands. [4,21,[27][28][29][30][31] Since the report on the MOF-templated synthesis of PC in 2008, [32] a large number of studies have been reported on the use of MOFs as suitable precursors/templates for carbon synthesis. [22,26,[33][34][35] At present, a large number of studies indicate that zeolitic imidazolate framework-8 (ZIF-8), MOF-5, MIL-125 (Ti) (MIL = Materials of Institute Lavoisier), and ZIF-67 with excellent thermal stability and unique porous structures are the more commonly used MOF precursors (Scheme 1). [3,36,37] All of them, ZIF-8, possessing nitrogen-containing ligands, has high porosity and thermal stability. [38][39][40] MOF-5 possesses excellent thermal stability, high porosity, and so on. [41] MIL-125, an active photocatalyst, includes cyclic octamers of TiO 2 octahedra. [42,43] ZIF-67 has a tunable pore aperture, highly stable structure, and catalytic activity. [37,44,45] The above-mentioned MOFs have been widely used for gas adsorption, molecular separation, catalysis, batteries, supercapacitors, and so on. [13,14,33] Moreover, carbon hybrids containing nanostructured metal species (e.g., metal oxides (MOs)) are likely to form under in situ carbonization conditions. [46] Compared with the carbonaceous materials from conventional precursors, MOF-derived carbon materials have significant advantages with high specific surface areas, tailorable porosities, unique morphologies, and easy functionalization with other heteroatoms. [14,23,31] For example, Xu and co-workers [47] obtained 1D carbon nanorods via the pyrolysis The applications of carbon and carbon-based materials with high porosity, high surface area, and functionalities based on metal-organic framework precursors and/or templates have attracted significant research interest in recent years, particularly in the field of batteries. The chemical and physical properties of carbon and carbon-based materials obtained by the heat treatment of various metal-organic ...
“…The direct growth of self‐supported ternary transition metal oxides on current‐collecting substrates was recently explored to overcome the drawbacks of mixing active electrode materials with binders and conductive additives, and the anode materials showed enhanced endurance and fast discharge–charge processes; in particular, CuCo 2 O 4 (Figure ) has exhibited good Li + storage properties because both anions contribute to the faradaic redox mechanism for electrochemical energy storage . However, CuCo 2 O 4 ‐based anodes suffer from large volume change upon cycling, causing drastic capacity fading that results in a short discharge–charge cycle life.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, a strategy for the fabrication of novel anode materials having specific surface areas maximized via morphology engineering, without losing other material properties, should be developed. In addition, 3D network structures of active materials can allow a large surface area for reactions and open channels for an efficient ion–electron transport, which are both important properties for their use in LIBs …”
The electrochemical kinetics and output capacity of active electrode materials are significantly influenced by their surface structure. Herein, the template‐free morphological evolution of CuCo2O4 is reported, which is achieved by controlling the nucleation and growth rate during the hydrothermal process and evaluating its anode performance. The charge‐transfer resistance and specific surface area of the fabricated CuCo2O4 anode films are influenced by the viscosity of the solvent used. The optimized mesoporous nanosheet anode exhibits a high specific discharge capacity (1547 mAh g–1) at 0.1 A g–1 and an excellent restoring capability (≈91%); it retains 88% of the initial capacity with a coulombic efficiency of ≈99% even after 250 discharge–charge cycles. The superior lithium‐ion energy storage performance of this anode is due to its electrochemically favorable porous 2D morphology with large Brunauer–Emmett–Teller (BET) specific surface area and pore volume, resulting in enhanced Li+ storage and intercalation property.
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