Urchin-Like Ni1/3Co2/3(CO3)(1/2)(OH)center dot 0.11H(2)O for Ultrahigh-Rate Electrochemical Supercapacitors: Structural Evolution from Solid to Hollow

作者：Wei, Wutao; Cui, Shizhong; Ding, Luoyi; Mi, Liwei^*; Chen, Weihua^*; Hu, Xianluo^*

来源：ACS Applied Materials & Interfaces, 2017, 9(46): 40655-40670.

DOI：10.1021/acsami.7b12392

• electronic and ionic conductivity
• hollow-urchin-like structure
• high rate performance
• long cycle life
• supercapacitors

Portable electronics and electric or hybrid electric vehicles are developing in the trend of fast charge and long electric mileage, which ask us to design a novel electrode with sufficient electronic and ionic transport channels at the same time. Herein, we fabricate a uniform hollow-urchin-like Ni1/3Co2/3(CO3)(1/2)(OH)center dot 0.11H(2)O electrode material through an easy self-generated and resacrificial template method. The one-dimensional chain-like crystal structure unit containing the metallic bonding and the intercalated OH- and H2O endow this electrode material with abundant electronic and ionic transport channels. The hollow-urchin-like structure built by nanorods contributes to the large electrode-electrolyte contact area ensuring the supply of ions at high current. CNTs are employed to transport electrons between electrode material and current collector. The as-assembled NC-CNT-2//AC supercapacitor device exhibits a high specific capacitance of 108.3 F g(-1) at 20 A g(-1), a capacitance retention ratio of 96.2% from 0.2 to 20 A g(-1), and long cycle life. Comprehensive investigations unambiguously highlight that the unique hollow-urchin-like Ni1/3Co2/3(CO3)(1/2)(OH)center dot 0.11H(2)O electrode material would be the right candidate for advanced next-generation supercapacitors.

• 出版日期2017-11-22
• 单位华中科技大学; 中原工学院; 郑州大学