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

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• 作者：Weiqing Kong ; Xidong Duan ; Yongjie Ge ; Hongtao Liu ; Jiawen Hu…
• 刊名：Nano Research
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：9
• 期：8
• 页码：2458-2466
• 全文大小：2,049 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000
• 卷排序：9

文摘

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 capacity as high as 26.8 mg·g−1 (applied potential: 1.2 V; initial NaCl concentration: ~5,000 mg·L−1).