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Ionics

, Volume 25, Issue 12, pp 5881–5888 | Cite as

In situ growth of hexagonal prism-like Ni(OH)2 microrods on nickel foam as binder-free electrodes

  • Gang Li
  • Zhuoqing Chang
  • Tingyu LiEmail author
  • Kaiying WangEmail author
Original Paper
  • 106 Downloads

Abstract

In this paper, we report in situ growth of hexagonal prism-like Ni(OH)2 microrods via one-step hydrothermal process, where nickel foam is directly oxidized in a high concentration hydrogen peroxide (H2O2) solution without additional nickel sources, surfactant, or post-treatment. The nickel foam not only serves as a nickel source but also as 3D scaffold for Ni(OH)2 growth to form binder-free electrodes. The in situ growth can ensure close contact between conductive Ni foam substrate and as-formed Ni(OH)2 microrods, providing efficient electron collection paths and electrochemical stability. Mass loading of Ni(OH)2 on nickel foam could be tailored by adjusting the concentration H2O2. Possible growth mechanism of hexagonal prism-like Ni(OH)2 microrods is discussed to understand the morphologies under various H2O2 concentrations. When works as a binder-free electrode, the Ni(OH)2-coated nickel foam exhibits a remarkable areal capacitance ~ 1.598 C cm−2 (560 C g−1) at a current density of 1 mA cm−2, relatively high rate capability with 57.14% areal capacitance retained at 10 mA cm−2, as well as better cycling stability with 72.9% areal capacitance remained after 3000 charge-discharge cycles. Such superior performance demonstrates that Ni(OH)2 microrods in situ grown on metallic nickel foam substrate might be a potential electrode material for electrochemical capacitors.

Keywords

Hydrothermal synthesis Nickel hydroxide microrods Supercapacitor Nickel foam 

Notes

Acknowledgments

We also thank Prof. Richard William Nelson’s kindness for proofreading.

Funding information

This research was financially supported by the National Natural Science Foundation of China (61674113, 51622507, and 61471255), and Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province, China (2016138). The author KW received financial support from the Norwegian Research Council-FRINATEK programme (231416/F20).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.MicroNano System Research Center, College of Information and Computer & Key Lab of Advanced Transducers and Intelligent Control System (Ministry of Education)Taiyuan University of TechnologyTaiyuanChina
  2. 2.Department of Microsystems-IMSUniversity of South-Eastern NorwayHortenNorway

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