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Nano Research

Article Title

Carbon quantum dot-induced self-assembly of ultrathin Ni(OH)2 nanosheets: A facile method for fabricating three-dimensional porous hierarchical composite micro-nanostructures with excellent supercapacitor performance

Authors

Guijuan Wei, State Key Laboratory of Heavy Oil Processing, College of Science and College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China
Kun Du, State Key Laboratory of Heavy Oil Processing, College of Science and College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China
Xixia Zhao, State Key Laboratory of Heavy Oil Processing, College of Science and College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China
Zhaojie Wang, State Key Laboratory of Heavy Oil Processing, College of Science and College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China
Ming Liu, State Key Laboratory of Heavy Oil Processing, College of Science and College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China
Chuang Li, State Key Laboratory of Heavy Oil Processing, College of Science and College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China
Hui Wang, Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, College of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China
Changhua An, State Key Laboratory of Heavy Oil Processing, College of Science and College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, College of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China
Wei Xing, State Key Laboratory of Heavy Oil Processing, College of Science and College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China

Keywords

carbon, self-assembly, hierarchical structures, energy storage

Abstract

ABSTRACT Significant efforts have been directed towards the preparation and application of porous hierarchically structured materials owing to their large surface area, rich active sites, and enhanced mass transport and diffusion. In this study, a simple and cost-effective method for the carbon quantum dot (CQD)-induced assembly of two-dimensional ultrathin Ni(OH)2 nanosheets into a threedimensional (3D) porous hierarchical structure was developed. The electrostatic forces between the CQDs and cations drove the self-assembly of the 3D CQDs/Ni(OH)2 hierarchical structures. As a new type of structure-directing agent, the CQDs played dual roles in tuning the morphology of the products and improving the supercapacitor performance. The multilevel CQDs/Ni(OH)2 micro-nanostructures had a large specific surface area and rich porosity. Owing to their unique structures and the conductivity of the CQDs, an optimized asymmetric supercapacitor using the CQDs/Ni(OH)2 exhibited a maximum specific capacity of 161.3 F·g–1 and a high energy density of 57.4 Wh·kg–1. This study introduces a potential method for the fabrication of many other 3D hierarchical structures with great potential for applications in various fields.

Graphical Abstract

Publisher

Tsinghua University Press

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