Abstract 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−1 at 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−1 at 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.

中文翻译：

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镍钴层状双氢氧化物纳米片，还原氧化石墨烯生长在碳布上，用于对称超级电容器

摘要 氢氧化镍作为一种潜在的电极材料被广泛应用于超级电容器，但由于其电导率低、结构不足、稳定性差等问题，其电化学性能受到限制。在这项工作中，我们报道了一种在导电碳布（Co-Ni-OH/rGO/CC）上垂直生长钴镍氢氧化物（Co-Ni-OH）和 rGO 纳米片的简单“一锅”水热法。我们证明了通过添加具有均匀垂直生长纳米结构的 rGO 可以显着提高 Co-Ni-OH 电极的电容性能，从而缩短离子扩散路径并避免界面电阻。作为赝电容器，所制备的 Co-Ni-OH/rGO/CC 电极显示出显着增强的比电容（2.5 A g-1 时为 151.46 F g-1）和良好的循环稳定性（1000 次循环后为 88.0%）。而且，由两个制备的 Co-Ni-OH/rGO/CC 电极组成的对称超级电容器在 1500 W kg-1（基于活性材料）的功率密度下实现了 30.29 W h kg-1 的高能量密度和显着的循环稳定性（3000 次循环后 85.6%）。这一发现为制造用于高性能超级电容器和其他储能设备的有前途的电极材料提供了一种简单有效的方法。