One-Step In Situ Self-Assembly of Cypress Leaf-Like Cu(OH)2 Nanostructure/Graphene Nanosheets Composite with Excellent Cycling Stability for Supercapacitors

Nanoscale Research Letters

Dongkai Jiang¹  Wenzhong Shen¹  Fanggang Li¹  Hao Yuan¹  Yuxiu You¹  Liguo Ma¹  Zhihao Zhai¹  Maojun Zheng² 

[1] 0000 0004 0368 8293, grid.16821.3c, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China;0000 0004 0368 8293, grid.16821.3c, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China;0000 0001 2314 964X, grid.41156.37, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China;

关键词: Cypress leaf-like Cu(OH) nanostructure;    graphene nanosheets;    outstanding cycling performance;   

DOI  :  10.1186/s11671-019-3000-4

来源: publisher

【 摘 要 】

Transition metal hydroxides and graphene composite holds great promise to be the next generation of high performance electrode material for energy storage applications. Here we fabricate the cypress leaf-like Cu(OH)2 nanostructure/graphene nanosheets composite through one-step in situ synthesis process, employed as a new type of electrode material for high efficiency electrochemical energy storage in supercapacitors. A solution-based two-electrode system is applied to synthesize Cu(OH)2/graphene hybrid nanostructure, where anodic graphene nanosheets firmly anchor cathodic Cu(OH)2 nanostructure due to the electrostatic interaction. The in situ self-assembly of Cu(OH)2/graphene ensures good structural robustness and the cypress leaf-like Cu(OH)2 nanostructure prompt to form the open and porous morphology. The hybrid structure would facilitate charge transport and effectively mitigate the volume changes during long-term charging/discharging cycles. As a consequence, the Cu(OH)2/graphene composite exhibits the highest capacitance of 317 mF/cm2 at the current density of 1 mA/cm2 and superior cyclic stability with no capacitance decay over 20,000 cycles and remarkable rate capability at increased current densities.

【 授权许可】

CC BY