Nickel-cobalt layered double hydroxide nanosheets with reduced graphene oxide grown on carbon cloth for symmetric supercapacitor
Nickel-cobalt layered double hydroxide nanosheets with reduced graphene oxide grown on carbon cloth for symmetric supercapacitor
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DOI：
10.1016/j.apsusc.2019.03.345
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发表时间：
2019-07
影响因子：
6.7
通讯作者：
Di Wang;A. Wei;Liyong Tian;Alfred Mensah;Dawei Li;Yang Xu;Q. Wei
中科院分区：
文献类型：
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作者：
Di Wang;A. Wei;Liyong Tian;Alfred Mensah;Dawei Li;Yang Xu;Q. Wei
氢氧化镍作为一种有潜力的电极材料在超级电容器中得到了广泛的应用，但由于其导电性低、结构不完整、稳定性差等原因，其电化学性能受到限制。在这项工作中，我们报道了一个简单的“一锅”水热法垂直生长钴镍氢氧化物（Co-Ni-OH）和rGO纳米片的导电碳布（Co-Ni-OH/rGO/CC）。结果表明，在Co-Ni-OH电极中添加具有均匀垂直生长纳米结构的rGO，缩短了离子扩散路径，避免了界面电阻，可显著提高电极的电容性能。作为赝电容器，所制备的Co-Ni-OH/rGO/CC电极显示出显著增强的比电容（在2.5 A g-1下为151.46 F g-1）和良好的循环稳定性（1000次循环后为88.0%）。此外，由两个如此制备的Co-Ni-OH/rGO/CC电极组成的对称超级电容器在1500 W kg−1的功率密度（基于活性材料）下实现了30.29 W h kg− 1的高能量密度和显著的循环稳定性（3000次循环后为85.6%）。这一发现为制备高性能超级电容器和其他储能装置的有前途的电极材料提供了一种简单有效的方法。
Nickel hydroxide as a potential electrode material was widely used in supercapacitor, but its electrochemical performance is limited due to its low conductivity, insufficient structure and weak stability. In this work, we reported a simple “one-pot” hydrothermal method of vertically growing cobalt-nickel hydroxide (Co-Ni-OH) and rGO nanosheets on conductive carbon cloth (Co-Ni-OH/rGO/CC). We demonstrated that the capacitive performance of Co-Ni-OH electrode could be significantly improved by adding rGO with uniform vertically growing nanostructure, which shortened ion diffusion paths and avoided the interface resistance. As pseudocapacitors, the as-prepared Co-Ni-OH/rGO/CC electrode showed a notable enhanced specific capacitance (151.46 F g−1at 2.5 A g−1) and a good cycling stability (88.0% after 1000 cycles). Moreover, the symmetric supercapacitor composed of two as-prepared Co-Ni-OH/rGO/CC electrodes achieved a high energy density of 30.29 W h kg−1at a power density of 1500 W kg−1(based on active materials) and remarkable cycling stability (85.6% after 3000 cycles). This finding provides a simple and effective way to fabricate a promising electrode material for high-performance supercapacitor and other energy storage device.