Xu Jie, Gai Shili, He Fei, Niu Na, Gao Peng, Chen Yujin, Yang Piaoping
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Sciences and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China.
Dalton Trans. 2014 Aug 14;43(30):11667-75. doi: 10.1039/c4dt00686k. Epub 2014 Jun 20.
Reduced graphene oxide (rGO) sheet and ternary-component Ni(1-x)Co(x)Al-layered double hydroxide (Ni(1-x)Co(x)Al-LDH) hybrid composites with an interesting sandwich structure have been fabricated by an in situ growth route. The as-obtained composite displays a sandwich architecture constructed by the self-assembly of sheet-like LDH crystals on both sides of the rGO sheets. It was found that the Co content doped in Ni(1-x)Co(x)Al-LDH plays an important role in the shape and structure of the final products. When the Co doped content is 17%, the rGO/Ni(0.83)Co(0.17)Al-LDH has a high surface area (171.5 m(2) g(-1)) and exhibits a perfect sandwich structure. In addition, this structure and morphology is favorable for a supercapacitor electrode material with a high performance. The influence of cobalt content on the electrochemical behavior of rGO/Ni(1-x)Co(x)Al-LDH has been systematically studied. The results indicate that the rGO/Ni(0.83)Co(0.17)Al-LDH composite exhibits the highest electrochemical performance, with a specific capacitance of 1902 F g(-1) at 1 A g(-1), and an excellent cycling stability. The markedly improved electrochemical performance is superior to undoped rGO/NiAl-LDH and can be attributed to the enhanced conductivity achieved through cobalt doping. Such composites could be used as a type of potential energy storage/conversion material for supercapacitors.
通过原位生长路线制备了具有有趣三明治结构的还原氧化石墨烯（rGO）片与三元组分Ni(1-x)Co(x)Al层状双氢氧化物（Ni(1-x)Co(x)Al-LDH）的杂化复合材料。所获得的复合材料呈现出一种三明治结构，该结构由片状LDH晶体在rGO片两侧自组装而成。研究发现，掺杂在Ni(1-x)Co(x)Al-LDH中的Co含量对最终产物的形状和结构起着重要作用。当Co掺杂量为17%时，rGO/Ni(0.83)Co(0.17)Al-LDH具有高比表面积（171.5 m(2) g(-1)），并呈现出完美的三明治结构。此外，这种结构和形态有利于高性能超级电容器电极材料。系统研究了钴含量对rGO/Ni(1-x)Co(x)Al-LDH电化学行为的影响。结果表明，rGO/Ni(0.83)Co(0.17)Al-LDH复合材料表现出最高的电化学性能，在1 A g(-1)时比电容为1902 F g(-1)，并且具有优异的循环稳定性。显著提高的电化学性能优于未掺杂的rGO/NiAl-LDH，这可归因于通过钴掺杂实现的电导率增强。此类复合材料可作为超级电容器的一种潜在储能/转换材料。
