奥斯特瓦尔德成熟
材料科学
柯肯德尔效应
化学工程
电化学
氧化物
超级电容器
阳极
电极
氢氧化物
石墨烯
阴极
硫化物
比能量
纳米棒
纳米技术
冶金
工程类
物理化学
化学
物理
量子力学
作者
Syam Kandula,Khem Raj Shrestha,G. Rajeshkhanna,Nam Hoon Kim,Joong Hee Lee
标识
DOI:10.1021/acsami.9b02978
摘要
By changing the mixed metal sulfide composition, morphology tuning of an active electrode material can be possible, which can have a huge impact on its electrochemical performance. Here, effective morphology tuning of Ni–Co layered double hydroxide (LDH)/MMoSx (M = Co, Ni, and Zn) heteronanostructures is demonstrated by varying the composition of MMoSx. Taking advantage of the benefits associated with Kirkendall growth and Ostwald ripening, tunable morphologies were successfully achieved. Among the Ni–Co LDH/MMoSx (M = Co, Ni, and Zn) heteronanostructures, a Ni–Co LDH/NiMoSx core–shell structured electrode delivered a high specific capacity of 404 mAh g–1 at 3 mA cm–2 and an extraordinary cycling stability (after 10 000 cycles) of 93.2% at 50 mA cm–2. In addition, an asymmetric supercapacitor (ASC) device coupled with Ni–Co LDH/NiMoSx as the cathode and Fe2O3/reduced graphene oxide as the anode exhibited excellent cell capacity and extraordinary cycling stability. Moreover, the ASC device provided a very high specific energy of 72.6 Wh kg–1 at a specific power of 522.7 W kg–1 and maintained the specific power of 23.5 Wh kg–1 at 5357.6 W kg–1, demonstrating its high applicability to energy storage devices.
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