Carbohydrazide-dependent reductant for preparing nitrogen-doped graphene hydrogels as electrode materials in supercapacitor

- Three-dimensional nitrogen-doped graphene hydrogels (NGHs) were prepared.
- Carbohydrazide was used as reducing and doping agents.
- NGHs exhibited relatively good electrochemical properties in supercapacitor.
- NGHs with different doping of N demonstrated different performances in supercapacitors.