0D-2D Cu2O microspheres@rGO composite for enhanced sodium storage

• Published in: Materials letters Vol. 319; p. 132297
• Main Authors: Hai, Benrong, Liu, Changsheng
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.07.2022; Elsevier BV
• Subjects: Anode material; Copper oxides; Cu2O microsphere; Electrochemical analysis; Energy storage; Graphene; Hybrid structures; Materials science; Microspheres; rGO; Sodium-ion batteries; Sodium-ion battery; Anode material; Cu2O microsphere; Sodium-ion battery; rGO
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2022.132297

•Large-sized 0D-2D Cu2O @rGO composite is prepared as an anode material for SIBs.•Cu2O@rGO composite exhibits high reversible capacity.•Unique microspherical Cu2O exhibits excellent electrochemical kinetics during charge–discharge process.•Large-sized 0D-2D structural design strategy shows great potentials for SIBs. A cuprous oxide microspheres@reduced graphene oxide (Cu2O@rGO) composite is successfully prepared and used as an anode active material for sodium-ion batteries. In the hybrid structure, large-sized 0D Cu2O microspheres (∼500 nm) are distributed on highly conductive 2D rGO layers. The Cu2O@rGO electrode delivers a high reversible capacity of 273.2 mAh g−1 at a current density of 50 mA g−1 after 100 cycles, significantly higher than regular-sized (less than100 nm) Cu2O/rGO composite (185.9 mAh g−1) and bare Cu2O particles (95.8 mAh g−1). Even at 1 A g−1, Cu2O@rGO still demonstrates a capacity of 189 mAh g−1 after 1000 cycles. The enhanced electrochemical performance of Cu2O@rGO might be ascribed to the continuous and stable 3D network structure, which is transformed from the unique large-sized 0D-2D architecture after cycling. The as-fabricated hybrid structure shows great potentials in energy storage applications.