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Rational Assembly of CoAl‐Layered Double Hydroxide on Reduced Graphene Oxide with Enhanced Electrochemical Performance for Energy Storage
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-06-12 , DOI: 10.1002/celc.201800510
Ting Liang 1 , Haicheng Xuan 1 , Yuekui Xu 1 , Jinhong Gao 1 , Xiaokun Han 1 , Jing Yang 1 , Peide Han 1 , Dunhui Wang 2 , Youwei Du 1, 2
Affiliation  

In this paper, we designed and synthesized composites of CoAl‐layered double hydroxide on reduced graphene oxide (CoAl‐LDH@rGO/NF) via a facile approach. The Co‐Al layered double hydroxide (CoAl‐LDH) nanosheets were grown onto the skeleton of reduced graphene oxide on Ni foam (rGO/NF). The as‐synthesized CoAl‐LDH@rGO/NF composites exhibited a superior electrochemical behavior, attributed to the coupling effect of homogeneous CoAl‐LDH nanosheets and high conductivity of rGO. In addition, the different morphologies of the CoAl‐LDH@rGO/NF composites can be controlled by adjusting the amount of NH4F. The optimum electrochemical performance of the CoAl‐LDH@rGO/NF hybrid electrode was obtained when the amount of NH4F was 6 mmol. The largest specific capacitance of 1671.4 F g−1 (1 A g−1) and the ultra‐high cycling performance with 97 % retention of the original value were achieved even after 5000 charge‐discharge cycles. A remarkable energy density value of 41.3 Wh kg−1 at a power density of 408.9 W kg−1 was achieved in the asymmetric supercapacitor (ASC) using CoAl‐LDH@rGO‐6/NF and activated carbon (AC) for positive and negative materials. Furthermore, the ASC retained 100 % of its original energy density value even after 5000 cycles. In addition, a design method for preparing high performance electrode materials with ideal morphology is proposed in this paper, which might be helpful to the future study of morphology and electrochemical properties.

中文翻译:

在还原的氧化石墨烯上合理组装CoAl层状双氢氧化物,并具有增强的电化学性能,以进行储能

在本文中,我们通过一种简便的方法设计并合成了在还原氧化石墨烯上的CoAl层状双氢氧化物的复合材料(CoAl-LDH @ rGO / NF)。将Co-Al层状双氢氧化物(CoAl-LDH)纳米片生长在镍泡沫(rGO / NF)上还原的氧化石墨烯的骨架上。合成的CoAl-LDH @ rGO / NF复合材料表现出优异的电化学性能,这归因于均相CoAl-LDH纳米片的耦合效应和rGO的高电导率。此外,可以通过调节NH 4 F的含量来控制CoAl-LDH @ rGO / NF复合材料的不同形态。当NH含量较高时,可以获得CoAl-LDH @ rGO / NF混合电极的最佳电化学性能。4 F为6mmol。最大比电容1671.4 F g -1即使经过5000次充放电循环,仍可实现(1 A g -1)和超高循环性能,并保持原始值97%。使用CoAl-LDH @ rGO-6 / NF和活性炭(AC)分别在正极和负极上使用CoAl-LDH @ rGO-6 / NF制成的非对称超级电容器(ASC)在408.9 W kg -1的功率密度下获得了41.3 Wh kg -1的显着能量密度值材料。此外,即使经过5000次循环,ASC仍保留其原始能量密度值的100%。此外,本文提出了一种制备具有理想形貌的高性能电极材料的设计方法,这可能对今后形貌和电化学性能的研究有所帮助。
更新日期:2018-06-12
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