Porous Mo–Co–S Nanosheets on Carbon Cloth for All‐Solid‐State Flexible Asymmetric Supercapacitors,Advanced Materials Interfaces

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Porous Mo–Co–S Nanosheets on Carbon Cloth for All‐Solid‐State Flexible Asymmetric Supercapacitors
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-09-25 , DOI: 10.1002/admi.201901138
Xiaoya Zhou ₁ , Yanfang Ren ₂ , Yao Lu ₁ , Zijin Cheng ₁ , Wenjun Wang ₂ , Qian Wang ₁ , Wei Huang ₃ , Xiaochen Dong _{1,

4}

Affiliation

High‐performance and flexible supercapacitors (SCs) have great potential for powering wearable and portable devices. Herein, Mo‐doped Co₉S₈ porous nanosheets on carbon cloth (denoted as Mo–Co–S/CC) are prepared for all‐solid‐state flexible asymmetric SCs via a two‐step method. Na₂MoO₄ is selected as both Mo source and etching agent to create Mo‐doped porous structure, which provides plenty of reaction sites contributing to the decrease of electrochemical barrier and increase of electrochemical performances. The Mo–Co–S/CC electrode demonstrates a high specific capacity of 771.5 F g⁻¹ at 2 A g⁻¹, excellent rate capability of 660.0 F g⁻¹ at 20 A g⁻¹, and 109% cycling capacitance retention after 30 000 cycles. By using poly(vinyl alcohol)/KOH (PVA/KOH) gel as electrolyte, a flexible all‐solid‐state asymmetric supercapacitor (Mo–Co–S/CC//KOH//AC/CC, FASCs) is assembled, which can work under different bending angles and deliver a specific capacitance of 37.37 F g⁻¹ at 1 A g⁻¹. Furthermore, the FASCs can deliver a maximum energy density of 14.68 Wh kg⁻¹ at power density of 369 W kg⁻¹, with the capacity retention of 80.07% over 30 000 cycles at a high rate of 20 A g⁻¹.

中文翻译：

用于全固态柔性不对称超级电容器的碳布上多孔Mo-Co-S纳米片

高性能和灵活的超级电容器（SC）在为可穿戴和便携式设备供电方面具有巨大的潜力。在此，通过两步法为全固态柔性不对称SC制备了碳布上的Mo掺杂的Co ₉ S ₈多孔纳米片（表示为Mo–Co–S / CC）。选择Na ₂ MoO ₄作为Mo源和蚀刻剂，以创建Mo掺杂的多孔结构，该结构提供了大量的反应位点，有助于降低电化学势垒并提高电化学性能。Mo–Co–S / CC电极在2 A g ^-1下显示出771.5 F g ^-1的高比电容，在20 A g下显示出660.0 F g ^-1的出色倍率性能^-1，并且在30 000次循环后保持109％的循环电容。通过使用聚乙烯醇/ KOH（PVA / KOH）凝胶作为电解质，组装了柔性全固态不对称超级电容器（Mo-Co-S / CC // KOH // AC / CC，FASC），可以在不同的弯曲角度下工作，并在1 A g ^-1下提供37.37 F g ^-1的比电容。此外，FASC可以在369 W kg ^-1的功率密度下提供最大能量密度为14.68 Wh kg ^-1，以20 A g ^-1的高速率在3万次循环中保持80.07％的容量。

更新日期：2019-09-25

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