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首页> 外文期刊>RSC Advances >Advanced binder-free electrodes based on CoMn2O4@Co3O4 core/shell nanostructures for high-performance supercapacitors
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Advanced binder-free electrodes based on CoMn2O4@Co3O4 core/shell nanostructures for high-performance supercapacitors

机译：基于CoMn2O4 @ Co3O4核/壳纳米结构的先进无粘结剂电极，用于高性能超级电容器

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Three-dimensional (3D) hierarchical CoMn _(2) O _(4) @Co _(3) O _(4) core/shell nanoneedleanosheet arrays for high-performance supercapacitors were designed and synthesized on Ni foam by a two-step hydrothermal route. The hybrid nanostructure exhibits much more excellent capacitive behavior compared with either the pristine CoMn _(2) O _(4) nanoneedle arrays alone or Co _(3) O _(4) nanosheets alone. The formation of an interconnected pore hybrid system is quite beneficial for the facile electrolyte penetration and fast electron transport. The CoMn _(2) O _(4) @Co _(3) O _(4) electrode can achieve a high specific capacitance of 1627 F g ~(?1) at 1 A g ~(?1) and 1376 F g ~(?1) at 10 A g ~(?1) . In addition, an asymmetric supercapacitor (ASC) was assembled by using the CoMn _(2) O _(4) @Co _(3) O _(4) core/shell hybrid nanostructure arrays on Ni foam as a positive electrode and activated carbon as a negative electrode in an aqueous 3 M KOH electrolyte. A specific capacitance of 125.8 F g ~(?1) at 1 A g ~(?1) (89.2% retention after 5000 charge/discharge cycles at a current density of 2 A g ~(?1) ) and a high energy density of 44.8 W h kg ~(?1) was obtained. The results indicate that the obtained unique integrated CoMn _(2) O _(4) @Co _(3) O _(4) nanoarchitecture may show great promise as ASC electrodes for potential applications in energy storage.
机译：设计了用于高性能超级电容器的三维（3D）分层CoMn _（2）O _（4）@Co _（3）O _（4）核/壳纳米针/纳米片阵列，并在Ni泡沫材料上通过两次合成步热液路线。与单独的原始CoMn _（2）O _（4）纳米针阵列或单独的Co _（3）O _（4）纳米片相比，杂化纳米结构展现出更加出色的电容性能。互连的孔混合系统的形成对于容易的电解质渗透和快速的电子传输是非常有益的。 CoMn _（2）O _（4）@Co _（3）O _（4）电极在1 A g〜（？1）和1376 F时可以实现1627 F g〜（？1）的高比电容g〜（？1）在10 A g〜（？1）。此外，通过使用CoMn _（2）O _（4）@Co _（3）O _（4）核/壳杂化纳米结构阵列在镍泡沫上作为正极组装非对称超级电容器（ASC）并激活碳在3 M KOH水溶液中作为负极。在1 A g〜（？1）时的比电容为125.8 F g〜（？1）（在2 A g〜（？1）的电流密度下进行5000次充电/放电循环后保持89.2％的电容）获得了44.8W·h·kg〜（Δ1）。结果表明，获得的独特的集成的CoMn _（2）O _（4）@Co _（3）O _（4）纳米结构可以作为ASC电极在储能方面的潜在应用显示出广阔的前景。

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