One-Step Catalytic Synthesis of CuO/Cu₂O in a Graphitized Porous C Matrix Derived from the Cu-Based Metal–Organic Framework for Li- and Na-Ion Batteries

Abstract

The hybrid composite electrode comprising CuO and Cu 2 O micronanoparticles in a highly graphitized porous C matrix (CuO/Cu 2 O-GPC) has a rational design and is a favorable approach to increasing the rate capability and reversible capacity of metal oxide negative materials for Li-and Na-ion batteries. CuO/Cu 2 O-GPC is synthesized through a Cu-based metal−organic framework via a one-step thermal transformation process. The electrochemical performances of the CuO/Cu 2 O-GPC negative electrode in Li-and Na-ion batteries are systematically studied and exhibit excellent capacities of 887.3 mAh g −1 at 60 mA g −1 after 200 cycles in a Li-ion battery and 302.9 mAh g −1 at 50 mA g −1 after 200 cycles in a Na-ion battery. The high electrochemical stability was obtained via the rational strategy, mainly owing to the synergy effect of the CuO and Cu 2 O micronanoparticles and highly graphitized porous C formed by catalytic graphitization of Cu nanoparticles. Owing to the simple one-step thermal transformation process and resulting high electrochemical performance, CuO/Cu 2 O-GPC is one of the prospective negative active materials for rechargeable Li-and Na-ion batteries.

Copper–Organic Framework Fabricated with CuS Nanoparticles: Synthesis, Electrical Conductivity, and Electrocatalytic Activities for Oxygen Reduction Reaction

“…The field emission‐scanning electron microscopy (FE‐SEM) and transmission electron microscopy (TEM) images show that nano‐CuS forms in and on the MOF, maintaining the octahedral crystal shape of Cu‐BTC (Figure and the Supporting Information, Table S1). The reason why the crystal shape is conserved in the present composites is not clear, but there have been some reports of the conservation of the morphologies of MOF crystals during the thermal transformation to CuO/Cu 2 O@C and the formation of mesoporous Co‐Ni‐O . The amounts of nano‐CuS in the composites were estimated based on the elemental analysis (EA) data, which were obtained after drying the samples at 90 °C for 24 h. In particular, for the EA data of sulfur, we assumed that nano‐CuS had a covellite phase with a Cu 2+ oxidation state as evidenced by powder X‐ray diffraction (PXRD), HRTEM, selected‐area electron diffraction (SAED), and X‐ray photoelectron spectroscopy (XPS) data (Supporting Information, Figure S1 and Table S2).…”

Copper–Organic Framework Fabricated with CuS Nanoparticles: Synthesis, Electrical Conductivity, and Electrocatalytic Activities for Oxygen Reduction Reaction

“…Ther eason why the crystal shape is conserved in the present composites is not clear, but there have been some reports of the conservation of the morphologies of MOF crystals during the thermal transformation to CuO/Cu 2 O@C and the formation of mesoporous Co-Ni-O. [40,41] Thea mounts of nano-CuS in the composites were estimated based on the elemental analysis (EA) data, which were obtained after drying the samples at 90 8 8Cf or 24 h. In particular, for the EA data of sulfur,weassumed that nano-CuS had acovellite phase with aCu 2+ oxidation state as evidenced by powder X-ray diffraction (PXRD), HRTEM, selected-area electron diffraction (SAED), and X-ray photoelectron spectroscopy (XPS) data (Supporting Information, Figure S1 and Table S2).…”

Fabrication of Cu2O-based Materials for Lithium-Ion Batteries

“…Owing to their attractive advantages of morphological diversity,simple synthesis, and environmental friendliness, Cu 2 Om aterials have attracted extensive attention as ap otentiala lternative for LIBs, [24] with core-shell Cu 2 O/Cu composites being prepared by an electrodeposition technology.A ne nhanced capacity retention (approximately 450 mAh g À1 )w as achieved as well as ah igh current density of 5mAcm À2 was obtained. [25] The obtaineda node material above exhibited reversibility at a speed of 100 mA g À1 .…”