Department of Electronic Engineering, Institute for Wearable Convergence Electronics, Kyung Hee University , 1 Seocheon-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea.
ACS Nano. 2017 Nov 28;11(11):10860-10874. doi: 10.1021/acsnano.7b04368. Epub 2017 Oct 18.
We report a flexible battery-type electrode based on binder-free nickel cobalt layered double hydroxide nanosheets adhered to nickel cobalt layered double hydroxide nanoflake arrays on nickel fabric (NC LDH NFAs@NSs/Ni fabric) using facile and eco-friendly synthesis methods. Herein, we utilized discarded polyester fabric as a cost-effective substrate for in situ electroless deposition of Ni, which exhibited good flexibility, light weight, and high conductivity. Subsequently, the vertically aligned NC LDH NFAs were grown on Ni fabric by means of a hot-air oven-based method, and fluffy-like NC LDH NS branches are further decorated on NC LDH NFAs by a simple electrochemical deposition method. The as-prepared core-shell-like nanoarchitectures improve the specific surface area and electrochemical activity, which provides the ideal pathways for electrolyte diffusion and charge transportation. When the electrochemical performance was tested in 1 M KOH aqueous solution, the core-shell-like NC LDH NFAs@NSs/Ni fabric electrode liberated a maximum areal capacity of 536.96 μAh/cm at a current density of 2 mA/cm and excellent rate capability of 78.3% at 30 mA/cm (420.5 μAh/cm) with a good cycling stability. Moreover, a fabric-based hybrid supercapacitor (SC) was assembled, which achieves a stable operational potential window of 1.6 V, a large areal capacitance of 1147.23 mF/cm at 3 mA/cm, and a high energy density of 0.392 mWh/cm at a power density of 2.353 mW/cm. Utilizing such high energy storage abilities and flexible properties, the fabricated hybrid SC operated the wearable digital watch and electric motor fan for real-time applications.
我们报告了一种基于无粘结剂镍钴层状双氢氧化物纳米片附着在镍钴层状双氢氧化物纳米片阵列上的柔性电池型电极，该电极是通过简便且环保的合成方法在镍织物（NC LDH NFAs@NSs/Ni 织物）上制备的。在此，我们利用废弃的聚酯织物作为成本效益高的基底，通过无电沉积法制备 Ni，其具有良好的柔韧性、轻便性和高导电性。随后，通过热空气炉法在 Ni 织物上垂直生长 NC LDH NFAs，并通过简单的电化学沉积法进一步在 NC LDH NFAs 上装饰蓬松的 NC LDH NS 分支。所制备的核壳状纳米结构提高了比表面积和电化学活性，为电解质扩散和电荷传输提供了理想的途径。在 1 M KOH 水溶液中测试电化学性能时，核壳状 NC LDH NFAs@NSs/Ni 织物电极在 2 mA/cm 的电流密度下释放出最大的面积容量为 536.96 μAh/cm，在 30 mA/cm 时具有出色的倍率性能（420.5 μAh/cm），具有良好的循环稳定性。此外，组装了基于织物的混合超级电容器（SC），其实现了稳定的工作电位窗口为 1.6 V，在 3 mA/cm 时的面积电容为 1147.23 mF/cm，在 2.353 mW/cm 的功率密度时的能量密度为 0.392 mWh/cm。利用这种高储能能力和柔韧性，所制备的混合 SC 可用于实时应用的可穿戴数字手表和电动马达风扇。
