Urchin-Like Ni1/3Co2/3(CO3)1/2(OH)•0.11H2O for Ultrahigh-Rate Electrochemical Supercapacitors: Structural Evolution from Solid to Hollow
Urchin-Like Ni1/3Co2/3(CO3)1/2(OH)•0.11H2O for Ultrahigh-Rate Electrochemical Supercapacitors: Structural Evolution from Solid to Hollow
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用于超高倍率电化学超级电容器的海胆状Ni1/3Co2/3(CO3)(1/2)(OH)中心点0.11H(2)O：从实心到空心的结构演变
DOI：
10.1021/acsami.7b12392
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发表时间：
2017-11-22
影响因子：
9.5
通讯作者：
Hu, Xianluo
中科院分区：
文献类型：
--
作者：
Wei, Wutao;Cui, Shizhong;Hu, Xianluo
便携式电子产品、电动汽车和混合动力汽车正朝着快速充电、长续航里程的方向发展，这就要求我们设计一种同时具有足够的电子和离子传输通道的新型电极。本文采用简单的自生成、牺牲模板法制备了均匀的空心海胆状Ni_（1/3）Co_（2/3）（CO_3）（1/2）（OH）中心点0.11H（2）O电极材料。一维链状晶体结构单元中的金属键和OH-、H_2O的插入使该电极材料具有丰富的电子和离子传输通道。由纳米棒构建的中空海胆状结构有助于大的电极-电解质接触面积，确保在高电流下供应离子。碳纳米管用于在电极材料和集电器之间传输电子。组装后的NC-CNT-2//AC超级电容器器件在20 A g（-1）下表现出108.3 F g（-1）的高比电容，从0.2到20 A g（-1）的电容保持率为96.2%，并且具有长的循环寿命。全面的研究明确指出，独特的空心海胆状Ni 1/3Co 2/3（CO 3）（1/2）（OH）中心点0.11H（2）O电极材料将是先进的下一代超级电容器的正确候选者。
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.