Enhanced electrochemical performance of CoAl-layered double hydroxide nanosheet arrays coated by platinum films
Enhanced electrochemical performance of CoAl-layered double hydroxide nanosheet arrays coated by platinum films
复制标题
DOI：
10.1016/j.electacta.2013.10.029
复制
发表时间：
2013-12-30
影响因子：
6.6
通讯作者：
Zhang, X. B.
中科院分区：
文献类型：
--
作者：
Cheng, J. P.;Fang, J. H.;Zhang, X. B.
采用简单的水热法在泡沫镍上合成了三维网状结构的钴铝层状双氢氧化物（LDH）纳米片。随后通过离子溅射用Pt膜薄层涂覆CoAl-LDH nonosheets，以促进集流体和CoAl-LDH活性材料之间的快速电子传输。通过控制溅射时间确定了获得最佳性能的Pt膜的最佳厚度。由CoAl-LDH纳米片溅射Pt膜5 min构建的超级电容器具有高的比电容（734.4F g（-1）at 3A g（-1））、优异的倍率性能以及循环稳定性。此外，它在6000次循环后显示出77%的长寿命，并且在测试后保留了其一般形态。讨论了Pt膜导电层和CoAl-LDH在提高电化学性能方面的协同作用，为设计新型高效的超级电容器电极材料提供了有益的线索。(C)2013爱思唯尔有限公司保留所有权利。
Three-dimensional network of cobalt and aluminum layered double hydroxide (LDH) nanosheets was synthesized on nickel foam by a simple hydrothermal method. The CoAl-LDH nonosheets were subsequently coated by ion sputtering with thin layers of Pt films to facilitate fast electron transport between current collector and the CoAl-LDH active materials. The optimal thickness of the Pt film acquiring the best performance was identified by applying various sputtering time in controlled experiments. The supercapacitor built by the CoAl-LDH nanosheets coated with Pt film sputtered for 5 min has a high specific capacitance (734.4 F g(-1) at 3 A g(-1)), excellent rate capability as well as cycling stability. Moreover, it showed a long life of 77% retention after 6000 cycles and its general morphology was preserved after the test. The synergetic affect of conductive layer of Pt films and CoAl-LDH on the improvement of electrochemical properties was discussed and this would provide a useful clue in designing novel and effective electrode materials for supercapacitors. (C) 2013 Elsevier Ltd. All rights reserved.