Holey graphene hydrogel with in-plane pores for high- performance capacitive desalination

Capacitive deionization is an attractive approach to water desalination and treatment. To achieve efficient capacitative desalination, rationally designed electrodes with high specific capacitances, conductivities, and stabilities are necessary. Here we report the construction of a three-dimensional...

Full description

Saved in:
Bibliographic Details
Published in:Nano research 2016-08, Vol.9 (8), p.2458-2466
Main Authors: Kong, Weiqing, Duan, Xidong, Ge, Yongjie, Liu, Hongtao, Hu, Jiawen, Duan, Xiangfeng
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Deionization
Desalination
Electrical conductivity
Electrical resistivity
Electrode materials
Electrodes
Electron transport
Graphene
Hydrogels
Ion transport
Ions
Materials Science
Nanostructure
Nanotechnology
Pathways
Pores
Porosity
Research Article
Sodium chloride
Specific surface
Structural hierarchy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Capacitive deionization is an attractive approach to water desalination and treatment. To achieve efficient capacitative desalination, rationally designed electrodes with high specific capacitances, conductivities, and stabilities are necessary. Here we report the construction of a three-dimensional （3D） holey graphene hydrogel （HGH）. This material contains abundant in-plane pores, offering efficient ion transport pathways. Furthermore, it forms a highly interconnected network of graphene sheets, providing efficient electron transport pathways, and its 3D hierarchical porous structure can provide a large specific surface area for the adsorption and storage of ions. Consequently, HGH serves as a binder-free electrode material with excellent electrical conductivity. Cyclic voltammetry （CV） measurements indicate that the optimized HGH can achieve specific capacitances of 358.4 F.g 1 in 6 M KOH solution and 148 F.g-1 in 0.5 M NaCl solution. Because of these high capacitances, HGH has a desalination capadty as high as 26.8 mg.g-1 （applied potential： 1.2 V; initial NaCI concentration： -5,000 mg.L-l）.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-016-1132-8