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首页> 外文期刊>Scientific reports. >Electrochemical Energy Storage Application and Degradation Analysis of Carbon-Coated Hierarchical NiCo2S4 Core-Shell Nanowire Arrays Grown Directly on Graphene/Nickel Foam
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Electrochemical Energy Storage Application and Degradation Analysis of Carbon-Coated Hierarchical NiCo2S4 Core-Shell Nanowire Arrays Grown Directly on Graphene/Nickel Foam

机译：碳涂层分层Nico 2 S 4 核心壳纳米线阵列直接在石墨烯/镍泡沫上生长的电化学储能施加及降解分析

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We developed a new electrode comprising thin carbon layer coated hierarchical NiCo2S4 core-shell nanowire arrays (NiCo2S4@C CSNAs) on graphene/Ni foam (Ni@G) substrates. The electrode showed outstanding electrochemical characteristics including a high specific capacitance of 253?mAh g?1 at 3 A g?1, high rate capability of 163?mAh g?1 at 50?A g?1 (~64.4% of that at 3?A g?1), and long-term cycling stability with a capacity retention of 93.9% after 5000 cycles. Comparative studies on the degradation of hierarchical NiCo2S4 CSNA electrodes with and without carbon coatings revealed that the morphology pulverization, structural separation at core/shell interface, and irretrievably chemical composition change of NiCo2S4 CSNAs electrode are major factors that deteriorate the electrochemical performance of the electrodes without carbon coating. The favorable roles of carbon coatings on hierarchical NiCo2S4 CSNAs were further clarified: (1) serving as a physical buffering layer that suppresses the structural breakdown; (2) retarding the chemical composition conversion of the NiCo2S4 CSNAs; and (3) providing extra path for charge transition in addition to the NiCo2S4 core nanowires. Understanding of the degradation mechanisms and the significance of the surface carbon coatings would provide useful guidelines for the design of new electrode materials for high-performance electrochemical devices.
机译：我们开发了一种新的电极，包括薄碳层涂覆的分层Nico 2 S 4 核心 - 壳纳米线阵列（Nico 2 s 4 < / sub> @c csnas）上石墨烯/ ni泡沫（ni @ g）衬底。电极显示出优异的电化学特性，包括高比电容为253ΩmahgΔ1/ sup>，在3 a g Δ1/ sup>，高速度能力为163？mah g α1 50？a g Δ1（3〜64.4％，在3〜g ？1 ），以及带有的长期循环稳定性5000次循环后的容量保留为93.9％。具有和不含碳涂层的分层Nico 2 S 4 csna电极降解的比较研究表明，核心/壳界面的形态粉碎，结构分离，以及无可挽回的化学成分Nico 2 s 4 Csnas电极的变化是劣化无碳涂层的电极电化学性能的主要因素。碳涂层在分层Nico 2 S 4 CSNA上的有利作用被进一步阐明：（1）用作抑制结构衰弱的物理缓冲层; （2）延迟Nico 2 S 4 CSNA的化学成分转化率; （3）除了Nico 2 S 4 核心纳米线之外，还提供电荷转换的额外路径。理解降解机制和表面碳涂层的重要性将为高性能电化学装置设计新电极材料提供有用的指导。

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