A Dendritic Nickel Cobalt Sulfide Nanostructure for Alkaline Battery Electrodes
A Dendritic Nickel Cobalt Sulfide Nanostructure for Alkaline Battery Electrodes
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用于碱性电池电极的树枝状镍钴硫化物纳米结构
DOI：
10.1002/adfm.201705937
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发表时间：
2018-06-06
影响因子：
19
通讯作者：
Parkin, Ivan P.
中科院分区：
文献类型：
--
作者：
Li, Wenyao;Zhang, Bingjie;Parkin, Ivan P.
设计并合成了宽度约为100 nm的均匀树枝状NiCo2S4@NiCo2S4层状纳米结构。从电化学反应的动力学分析来看，这些电极在可充电碱性电池(RAB)中起作用。当电流密度从40 mA cm(-2)增加到240 mA cm(-2)时，在240 mA cm(-2)的大电流密度下，电极表现出的树枝状结构具有高的放电比容量为4.43 mAhcm(-2)和70.1%的倍率性能。在循环伏安测试中，在0.5 mV S(-1)的低扫描速度下，半扩散控制的电化学反应占总容量的92%，而在20 mV S(-1)的高扫描速度下，这一值下降到约43%。这些结果有助于对RABS的反应机理进行详细的分析，并为新的电极材料提供设计概念。
A uniform dendritic NiCo2S4@NiCo2S4 hierarchical nanostructure of width approximate to 100 nm is successfully designed and synthesized. From kinetic analysis of the electrochemical reactions, those electrodes function in rechargeable alkaline batteries (RABs). The dendritic structure exhibited by the electrodes has a high discharge-specific capacity of 4.43 mAh cm(-2) at a high current density of 240 mA cm(-2) with a good rate capability of 70.1% after increasing the current densities from 40 to 240 mA cm(-2). At low scan rate of 0.5 mV s(-1) in cyclic voltammetry test, the semidiffusion controlled electrochemical reaction contributes approximate to 92% of the total capacity, this value decreases to approximate to 43% at a high scan rate of 20 mV s(-1). These results enable a detailed analysis of the reaction mechanism for RABs and suggest design concepts for new electrode materials.