Three-dimensional N- and S-codoped graphene hydrogel with in-plane pores for high performance supercapacitor

12Citations
Citations of this article
11Readers
Mendeley users who have this article in their library.

Abstract

Rationally designed electrodes with a high specific surface area, conductivity, and ion diffusion rate are essential for high performance supercapacitors. Hereby, we report the construction of a three-dimensional (3D) N- and S-codoped graphene hydrogel with abundant in-plane pores (NS-HGH). In NS-HGH, its highly interconnected network structure largely restrains the restacking of the graphene sheets, offering a specific surface area of as high as 317 m2 g−1. The abundant intimate graphene sheet-sheet contacts and in-plane pores created provide efficient electron transport pathways and ion transport pathways, respectively. The dopants of N and S heteroatoms further improve the porosity and conductivity of the resultant NS-HGH. With these characteristics, the NS-HGH electrode exhibits a high specific capacitance of 320.0 F g−1 at 1 A g−1 and retains 96.4% of the initial capacitance upon 10000 potential cycles at 10 A g−1. Whiles, the supercapacitors made from the NS-HGH electrodes deliver an impressive gravimetic energy density of 24.7 Wh kg−1 at 1 A g−1. To understand the high capacitive performance of the NS-HGH, we further performed first-principle simulations. It is revealed that heteroatom doping offers additional capacitance to NS-HGH because its density of states (DOS) near the Fermi energy level can be largely increased as a result of abundant polarized sites produced. These results suggest that NS-HGH shows great potential for practical application.

Cite

CITATION STYLE

APA

Kong, W., Zhu, J., Zhang, M., Liu, Y., & Hu, J. (2018). Three-dimensional N- and S-codoped graphene hydrogel with in-plane pores for high performance supercapacitor. Microporous and Mesoporous Materials, 268, 260–267. https://doi.org/10.1016/j.micromeso.2018.04.029

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free