Hollow mesoporous carbon nanospheres space-confining ultrathin nanosheets superstructures for efficient capacitive deionization

Yijian Tang; Shasha Zheng; Shuai Cao; Feiyu Yang; Xiaotian Guo; Songtao Zhang; Huaiguo Xue; Huan Pang

doi:10.1016/j.jcis.2022.07.034

Hollow mesoporous carbon nanospheres space-confining ultrathin nanosheets superstructures for efficient capacitive deionization

J Colloid Interface Sci. 2022 Nov 15:626:1062-1069. doi: 10.1016/j.jcis.2022.07.034. Epub 2022 Jul 8.

Authors

Yijian Tang¹, Shasha Zheng¹, Shuai Cao¹, Feiyu Yang¹, Xiaotian Guo¹, Songtao Zhang¹, Huaiguo Xue¹, Huan Pang²

Affiliations

¹ School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, PR China.
² School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, PR China. Electronic address: panghuan@yzu.edu.cn.

PMID: 35839675
DOI: 10.1016/j.jcis.2022.07.034

Abstract

In this work, we propose a novel strategy to fabricate nickel silicate nanoflakes inside hollow mesoporous carbon spheres (Ni₃Si₂O₅(OH)₄/C). Hollow mesoporous carbon spheres (HMCSs) can well regulate and limit the growth of Ni₃Si₂O₅(OH)₄ nanosheets, which obviously enhance the structural stability and conductivity of the composites. The core-shell Ni₃Si₂O₅(OH)₄/C superstructure has been proven to possess an extremely excellent electrosorption capacity of 28.7 mg g^-1 at 1.2 V under a NaCl concentration of 584 mg L^-1 for capacitive deionization (CDI). This outstanding property can be attributed to the core-shell superstructure with ultrathin Ni₃Si₂O₅(OH)₄ nanosheets as the stable core and mesoporous carbon as the conductive shell. This work will provide a direction for the application of core-shell superstructure carbon-based nanomaterials as high-performance electrode materials for CDI.

Keywords: Capacitive deionization; Core-shell; Hollow mesoporous carbon nanospheres; Superstructures; Ultrathin nanosheets.