Hetero-nanostructures constructed by 2D porous metal oxide/hydroxide nanosheets supported on 1D hollow Co9S8 nanowires for hybrid supercapacitors with high areal capacity,Inorganic Chemistry Frontiers

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Hetero-nanostructures constructed by 2D porous metal oxide/hydroxide nanosheets supported on 1D hollow Co9S8 nanowires for hybrid supercapacitors with high areal capacity
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2021-08-18 , DOI: 10.1039/d1qi00814e
Yifan Pan ₁ , Jinhe Wei ₁ , Dandan Han ₁ , Qian Xu ₁ , Dongyan Gao ₁ , Yaobin Yang ₁ , Yen Wei ₂

Affiliation

The rational design of positive electrodes for hybrid supercapacitors is profound for applications in energy storage and conversion. Herein, we designed porous-hollow Co₉S₈/NiCo-Mo one-dimensional (1D) hetero-nanostructures on carbon cloth as battery-type electrodes. In particular, Ni–Co double hydroxide and Mo oxide grow on the surface of hollow Co₉S₈ nanowires, providing rich active sites. Meanwhile, the hollow structure of the Co₉S₈ nanowires is beneficial for electrolyte penetration and slows down the volume change caused by the continuous charge and discharge process. Moreover, the Co₉S₈/NiCo-Mo oxide/hydroxide electrode exhibits a remarkable areal capacity of 3.07 mA h cm⁻² (1 mA cm⁻²), and a hybrid supercapacitor based on Co₉S₈/NiCo-Mo nanostructures and activated carbon (AC) can output a high specific energy of 37.6 W h kg⁻¹ at a specific power of 228.7 W kg⁻¹ with decent cycling stability (capacity retention of 87.7% after 10 000 cycles). Two connected HSCs can light up a red-light emitting diode (LED) and make the motor turn for more than 5 min. The results indicate that the unique integrated Co₉S₈/NiCo-Mo nanostructure shows great potential as a novel battery-type electrode for supercapacitors.

中文翻译：

由一维空心Co9S8纳米线支撑的二维多孔金属氧化物/氢氧化物纳米片构建的异质纳米结构，用于具有高面积容量的混合超级电容器

混合超级电容器正极的合理设计对于能量存储和转换的应用意义重大。在此，我们在碳布上设计了多孔空心 Co ₉ S ₈ /NiCo-Mo 一维 (1D) 异质纳米结构作为电池型电极。特别是，Ni-Co 双氢氧化物和 Mo 氧化物在空心 Co ₉ S ₈纳米线的表面生长，提供了丰富的活性位点。同时，Co ₉ S ₈纳米线的中空结构有利于电解液的渗透，减缓连续充放电过程引起的体积变化。此外，Co ₉ S ₈/NiCo-Mo 氧化物/氢氧化物电极的面积容量高达 3.07 mA h cm ^-2 (1 mA cm ^-2 )，基于 Co ₉ S ₈ /NiCo-Mo 纳米结构和活性炭 (AC)的混合超级电容器可以在 228.7 W kg ^-1的比功率下输出 37.6 W h kg ^-1的高比能量，并具有良好的循环稳定性（10 000 次循环后容量保持率为 87.7%）。两个连接的 HSC 可以点亮红色发光二极管 (LED) 并使电机转动 5 分钟以上。结果表明，独特的集成 Co ₉ S ₈ /NiCo-Mo 纳米结构显示出作为超级电容器新型电池型电极的巨大潜力。

更新日期：2021-09-10

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