Holey graphene hydrogel with in-plane pores for high-performance capacitive desalination |
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| Affiliation: | 1. State Key Laboratory for Chemo/Biosensing and Chemometrics Department of Chemistry and Chemical Engineering, Hunan University,Changsha 410082, China;2. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;3. State Key Laboratory for Chemo/Biosensing and Chemometrics Department of Chemistry and Chemical Engineering, Hunan University,Changsha 410082, China ;Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA |
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| Abstract: | 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 NaC1 solution.Because of these high capacitances,HGH has a desalination capacity as high as 26.8 mg.g-1 (applied potential:1.2 V;initial NaCl concentration:～5,000 mg.L-1). |
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| Keywords: | capacitive deionization desalination electrochemical capacitor graphene hydrogel(GH) in-plane pore |
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