Wang Lu, You Junhua, Zhao Yao, Bao Wanting
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China.
Dalton Trans. 2022 Feb 22;51(8):3314-3322. doi: 10.1039/d1dt04002b.
The core-shell structured CuO@NiCoMn-LDH electrode was synthesized by wet chemistry, calcination, and electrodeposition. The synergistic effect of CuO nanowires and NiCoMn-LDH nanosheets has a significant enhancement effect on electrode materials. At the same time, the Mn content plays a decisive role in regulating and optimizing the morphology and electrochemical performance of electrode materials. The optimized CuO@NiCoMn-LDH, a binder-free electrode, exhibits excellent electrochemical performance. It displays a high specific capacity of 2.66 mA h cm (20.7 F cm, 336.71 mA h g) at 10 mA cm and satisfactory cycling stability (under a current density of 30 mA cm, after 3000 cycles, the capacity retention rate is 94.82%). In addition, an asymmetric supercapacitor (ASC) is built using the CuO@NiCoMn-LDH electrode as the positive electrode and FeO@C/CuO electrode as the negative electrode to demonstrate its practical applicability in energy storage devices. At a power density of 4.79 mW cm, the ASC device can achieve a maximum energy density of 2.67 mW h cm. Two ASC devices are used as the power source of the light emitting diode (LED), which can emit light continuously for 15 minutes, showing great potential in energy storage device applications.
通过湿化学法、煅烧和电沉积合成了核壳结构的CuO@NiCoMn-LDH电极。CuO纳米线与NiCoMn-LDH纳米片的协同效应对电极材料有显著的增强作用。同时，Mn含量对调节和优化电极材料的形貌及电化学性能起决定性作用。优化后的无粘结剂电极CuO@NiCoMn-LDH表现出优异的电化学性能。在10 mA cm时，其比容量高达2.66 mA h cm（20.7 F cm，336.71 mA h g），且具有令人满意的循环稳定性（在30 mA cm的电流密度下，经过3000次循环后，容量保持率为94.82%）。此外，以CuO@NiCoMn-LDH电极为正极、FeO@C/CuO电极为负极构建了非对称超级电容器（ASC），以证明其在储能器件中的实际应用潜力。在功率密度为4.79 mW cm时，该ASC器件可实现最大能量密度2.67 mW h cm。两个ASC器件用作发光二极管（LED）的电源，可连续发光15分钟，在储能器件应用中显示出巨大潜力。
