假电容器
纳米片
材料科学
硫化钴
钴
氢氧化物
硫化物
电化学
化学工程
硫代硫酸盐
水溶液
氢氧化钴
电极
超级电容器
无机化学
电容
纳米技术
化学
冶金
硫黄
有机化学
物理化学
工程类
作者
Ji‐Hyun Cha,Eun Bi Park,Sang Wook Han,Young Dok Kim,Duk‐Young Jung
标识
DOI:10.1002/asia.201801749
摘要
The direct synthesis of nanostructured electrode materials on three-dimensional substrates is important for their practical application in electrochemical cells without requiring the use of organic additives or binders. In this study, we present a simple two-step process to synthesize a stable core-shell structured cobalt sulfide/cobalt aluminum hydroxide nanosheet (LDH-S) for pseudocapacitor electrode application. The cobalt aluminum layered double hydroxide (CoAl-LDH) nanoplates were synthesized in basic aqueous solution with a kinetically-controlled thickness. Owing to the facile diffusion of electrolytes through the nanoplates, thin CoAl-LDH nanoplates have higher specific capacitance values than thick nanoplates. The as-grown CoAl-LDH nanoplates were transformed into core-shell structured LDH-S nanosheets by a surface modification process in Na2 S aqueous solution. The chemically robust cobalt sulfide (CoS) shell increased the electrochemical stability compared to the sulfide-free CoAl-LDH electrodes. The LDH-S electrodes exhibited high electrochemical performance in terms of specific capacitance and rate capability with a galvanostatic discharge of 1503 F g-1 at a current density of 2 A g-1 and a specific capacitance of 91 % at 50 A g-1 .
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