Rational Assembly of CoAl‐Layered Double Hydroxide on Reduced Graphene Oxide with Enhanced Electrochemical Performance for Energy Storage,ChemElectroChem

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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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