High‐Performance 2.6 V Aqueous Asymmetric Supercapacitors based on In Situ Formed Na 0.5 MnO 2 Nanosheet Assembled Nanowall Arrays
Nanjing University of Science and Technology
Abstract
The voltage limit for aqueous asymmetric supercapacitors is usually 2 V, which impedes further improvement in energy density. Here, high Na content Birnessite Na 0.5 MnO 2 nanosheet assembled nanowall arrays are in situ formed on carbon cloth via electrochemical oxidation. It is interesting to find that the electrode potential window for Na 0.5 MnO 2 nanowall arrays can be extended to 0–1.3 V (vs Ag/AgCl) with significantly increased specific capacitance up to 366 F g −1 . The extended potential window for the Na 0.5 MnO 2 electrode provides the opportunity to further increase the cell voltage of aqueous asymmetric supercapacitors beyond 2 V. To construct the asymmetric supercapacitor, carbon‐coated Fe 3 O 4…
Citation impact
- FWCI
- 26.04
- Percentile
- 100%
- References
- 46
Authors
6Topics & keywords
- Nanosheet
- Materials science
- Supercapacitor
- In situ
- Aqueous solution
- Nanotechnology
- Chemical engineering
- Capacitance
- Affordable and clean energy