Nano Research

, Volume 10, Issue 9, pp 3005–3017 | Cite as

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

Research Article


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 three-dimensional (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.


carbon self-assembly hierarchical structures energy storage 


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The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (Nos. 51402362 and 21471160), Shandong Provincial Natural Science Foundation, China (Nos. ZR2014EMQ012 and ZR2016BM12), the Fundamental Research Funds for the Central Universities (Nos. 15CX08010A, 16CX05016, and 16CX05014A), and the start-up fund from TJUT.

Supplementary material

12274_2017_1516_MOESM1_ESM.pdf (2.5 mb)
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


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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Guijuan Wei
    • 1
  • Kun Du
    • 1
  • Xixia Zhao
    • 1
  • Zhaojie Wang
    • 1
  • Ming Liu
    • 1
  • Chuang Li
    • 1
  • Hui Wang
    • 2
  • Changhua An
    • 1
    • 2
  • Wei Xing
    • 1
  1. 1.State Key Laboratory of Heavy Oil Processing, College of Science and College of Chemical EngineeringChina University of PetroleumQingdaoChina
  2. 2.Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, College of Chemistry and Chemical EngineeringTianjin University of TechnologyTianjinChina

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