Co/N Co-Doped MoS2 with High Pseudocapacitive Performance for Solid-State Flexible Supercapacitors

作者：Jia, Wenhan; Wu, Hao; Zheng, Yunxin; Liu, Ziyi; Cai, Gaotuo; Wen, Jianfeng; Hu, Guanghui; Tang, Tao; Li, Xinyu; Jiang, Li; Wang, Zhiyong; Li, Ming^*; Huang, Haifu^*

来源：ACS Applied Energy Materials, 2023.

DOI：10.1021/acsaem.2c04044

• supercapacitor
• MoS2 nanosheet
• pseudocapacitance
• flexible electrode
• first-principles calculations

Herein, we demonstrate the enhanced pseudocapa-citive performance of a MoS2-based flexible supercapacitor by the co-doping strategy of cations and anions. The MoS2 nanosheet arrays on carbon cloth are directly doped with N and Co atoms through a simple hydrothermal process. The obtained cation and anion co-modified MoS2 (N-Co-MoS2) shows improved electron transport efficiency and enhanced active sites for MoS2. According to the first-principles calculations, N-Co-MoS2 has a unique band structure and high electrical conductivity. As expected, N-Co-MoS2 shows higher capacitive performance with 5072.5 mF cm-2 and a better cycle life (retaining 100% capacitance after 10,000 cycles) than pure MoS2. Furthermore, a solid-state flexible N-Co-MoS2 supercapacitor device is fabricated to demonstrate excellent mechanical stability with a specific capacitance of 3236 mF cm-2 and a stable cycle capacitance of 75.56% after 5000 cycles. In our work, we have provided a reference for preparing MoS2-based materials with good supercapacitive performance.

• 单位
  桂林理工大学; 广西大学