Details

Autor(en) / Beteiligte

• Wang, Fangqiao
• Zhao, Zhibo
• Fu, Xiaoguang
• Li, Baobao
• Chen, Zhuomin
• Wang, Senjing
• Huang, Qiaoling
• Xu, Qingchi
• Ye, Meidan

Titel

Alternately electrodeposited mesoporous NiCoSe@MnO nanocomposite-anchored Ni-Co layered double hydroxide nanoneedles for hybrid supercapacitors

Ist Teil von

• Journal of materials chemistry. C, Materials for optical and electronic devices, 2024-06, Vol.12 (22), p.84-813

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A rational strategy for preparing effective electrode materials is crucial for high-performance electrochemical energy storage devices. Herein, a facile route to construct hierarchical composite electrodes (NiCoLDH@NiCoSe 2 @MnO 2 ) consisting of hydrothermally synthesized NiCo-layered double hydroxide (NiCoLDH) nanoneedle arrays decorated with alternately electrodeposited NiCoSe 2 and MnO 2 nanocrystals on carbon fibers was developed. The NiCoLDH nanoneedles are designed to facilitate the one-step electrodeposited growth of NiCoSe 2 nanoparticles for 60 s and also strengthen the interfacial contact between the NiCoSe 2 film and the conductive fiber substrate. While the secondary electrodeposition of MnO 2 layers for 40 s further enhances the electrochemical performance and cycling stability of composite electrodes, such composite electrodes display a high area specific capacitance of 1051.3 mF cm −2 at 1 mA cm −2 , with obviously superior capacitance retention (∼80%) to that of NiCoLDH@NiCoSe 2 (∼49%) after 5000 cycles. Then, the corresponding fiber-shaped supercapacitors provide an energy density of 45.00 μW h cm −2 at a power density of 800.00 μW cm −2 while having good stability. Notably, this fabrication strategy is also available for other conductive substrates ( e.g. , metal fibers/wires). This work presents a low cost, simple operation and efficient way for the in situ preparation of high-performance electrode materials for electrochemical energy storage applications. A rational strategy was designed to hydrothermally grow NiCo-layered double hydroxide nanoneedles with alternately electrodeposited NiCoSe 2 and MnO 2 on carbon fibers with enhanced electrochemical performance and cycling stability.