Facile fabrication of three-dimensional hierarchical CuO nanostructures with enhanced lithium storage capability

Abstract

5Three-dimensional hierarchical CuO nanostructures with uniform flower-like and urchin-like morphologies have been successfully prepared by a facile, cheap and environmental friendly solvothermal method. The as-prepared flower-like CuO is constructed by nanopetals, which is composed of 10 nanoparticles, and the urchin-like CuO with hollow structure is composed of tightly ranged nanorods. As anode materials for lithium-ion batteries, the flower-like CuO material exhibits high initial discharge capacitance (1457.2 mAh g -1 at 100 mA g -1 ), good rate capability and excellent cycling 15 stability. The superior electrochemical performance is mainly attributed to the hierarchical structure and the nanosize of the nanoparticles composed of the nanopetals, which benefit electrons and Li ions transportation, provide large electrodeelectrolyte contact area. The extra capacity of the samples 20 may due to the partial reversible formation and decomposition of the gel-like SEI film on the surface of the electrode and pseudocapacitance. Graphical AbstractThree-dimensional hierarchical CuO nanostructures with uniform flower-like and urchin-like morphologies have been prepared by a facile solvothermal method. The CuO materials display high initial discharge capacitance, good rate capability and excellent cycling stability as anode materials for rechargeable lithium-ion batteries.

In-Situ Growing Mesoporous CuO/O-Doped g-C3N4 Nanospheres for Highly Enhanced Lithium Storage

“…During the first lithiation process, the abroad and weak reduction peak observed at ∼2.0 V is ascribed to the initial construction of Li x CuO. 49 The other two peaks observed at 1.14 and 0.56 V belong to the phase transformation from Li x CuO to Cu 2 O and to Cu 0 , respectively. The peak observed at voltages below 0.3 V correspond to solid electrolyte interphase (SEI), while the observed peaks at 2.4 and 2,73 V during the first delithiation process refer to the obverse conversion reaction of Cu 0 to Cu 2 O and then to CuO.…”

“…Figure5ashows the CV curves for CuO/O-doped g-C 3 N 4 nanocomposite. During the first lithiation process, the abroad and weak reduction peak observed at ∼2.0 V is ascribed to the initial construction of Li x CuO 49. The other two peaks observed at 1.14 and 0.56 V belong to the phase transformation from Li x CuO to Cu 2 O and to Cu 0 , respectively.…”

Yucca fern shaped CuO nanowires on Cu foam for remitting capacity fading of Li-ion battery anodes

“…It clearly exhibits that three electrochemical reduction steps accompany the lithiation process. During the first cathodic sweep, a broad but weak peak appears at about 2.1 V which belongs to the initial formation of Li x CuO 26 . Then, two succession reduction peaks are observed at 1.0 V and 0.7 V, which are associated with the further conversion reaction with deep lithiation.…”

“… CuO materials Synthesis method Current density (mA g −1 ) Cycle number Capacity (mA g −1 ) Ref. Leaf-like Hydrothermal method 67 55 421 25 Flower-like Hydrothermal method 67 50 392.4 17 Octahedral crystals Reduction and calcination 134 50 440 26 Nanoplates Hydrothermal method 335 50 281.6 15 Dandelion-like Hydrothermal and calcination 67 50 400 27 Hollow nanospheres Cu 2 O oxidation 150 50 91 28 Spherical Pyrolysis of MOF 100 40 500 29 Core-shell nanowires Hydrothermal and oxidation 100 50 345 30 Bowknot-like Solution route and calcination 100 30 470 31 CuO NWs@Cu foam Anodization and calcination 100 50 510.1 This work CuO NWs@Cu foam Anodization and calcination 100 100 461.5 This work …”

Gold Nanoparticles Supported on Urchin-Like CuO: Synthesis, Characterization, and Their Catalytic Performance for CO Oxidation

“…In particular, urchin-like CuO architectures, assembled with one-or two-dimensional nanostructures, have excellent properties for various applications (such as gas sensors, battery, photocatalysts, etc.) due to their strong supplying capacity of active sites, high thermal stability and advanced capability of electron transfer [32,33]. Although the urchin-like CuO support could greatly promote the catalytic properties of noble metal, the researches over the urchin-like CuO support combined with the noble metals has been rarely studied.…”