微观结构
材料科学
超级电容器
介孔材料
化学工程
层状双氢氧化物
兴奋剂
电导率
电容
金属氢氧化物
纳米技术
金属
冶金
复合材料
化学
电极
催化作用
有机化学
物理化学
光电子学
工程类
氢氧化物
作者
Yushuai Yao,Huijuan Li,Young Moon Yu,Cheng Du,Liu Wan,Hui Ye,Jian Chen,Yan Zhang,Mingjiang Xie
标识
DOI:10.1016/j.est.2022.106422
摘要
Increasing the inherent conductivity and improving the structural stability of the metal hydroxides based electrode materials would break through the bottleneck of poor cycling lifespan of the metal hydroxides based supercapacitor resulted from the poor structural stability upon continual charge/discharge process. However, to create a metal hydroxide having both characteristics at the same time remains a challenge. Herein, we presented a Mg-coordinated self-assembly and ion-exchange method to grow Co-Ni LDH into carbonaceous mesopores forming a confined structure with magnesium doping. The parent substrate of mesoporous carbon not only favors the increase of conductivity of Co-Ni LDH but also provides a confined space stabilizing its microstructure, while, the non-electrochemically-active component of Mg(OH)2 could make the active skeleton stable enough to resist repeated charge/discharge. Benefiting to these unique features of confined structure and magnesium doping, the resultant Co-Ni LDH/MC based asymmetric supercapacitor exhibit a superior energy storage level including high energy density of 37 Wh/[email protected] W/kg and superlong cycling stability with about 91.1 % capacitance retention of the first cycle after 30,000 cycle continual charge/discharge, offering great potential as qualified candidate for energy storage device.
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