N/O co-enriched graphene hydrogels as high-performance electrodes for aqueous symmetric supercapacitors.

ABSTRACT: In this study, an easy one-pot hydrothermal strategy was used to prepare N/O co-enriched graphene hydrogels (NOGHs) using graphene oxide (GO) solution and n-propylamine as a reactant. The n-propylamine can be used not only as a reductant, nitrogen dopant and structure regulator, but also as a spacer to inhibit the agglomeration of graphene sheets. Benefiting from the synergistic effect between the heteroatoms (N, O), 3D porous structures and high specific surface area, the as-prepared NOGH samples present excellent electrochemical properties. Remarkably, the NOGH-140 based binder-free symmetric supercapacitor shows a high specific capacitance of 268.1 F g^-1 at the current density of 0.3 A g^-1 and retains 222.5 F g^-1 (82.9% of its initial value

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC9033685 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature