Surface-Confined Fabrication of Ultrathin Nickel Cobalt-Layered Double Hydroxide Nanosheets for High-Performance Supercapacitors

Juan Yang, Chang Yu, Chao Hu, Man Wang, Shaofeng Li, Huawei Huang, Karen Bustillo, Xiaotong Han, Changtai Zhao, Wei Guo, Zhiyuan Zeng, Haimei Zheng, Jieshan Qiu

Research output: Contribution to journalArticlepeer-review

215 Scopus citations

Abstract

The design and fabrication of 2D nanostructure electrodes with desired electrochemical activities is highly demanded for electrocatalysis and supercapacitors. Herein, the tuned fabrication of ultrathin and tortuous nickel/cobalt-layered double hydroxide (NiCo-LDH) nanosheets via a graphene oxide (GO) surface-confined strategy is reported, yielding nanosheets with a thickness of 1.7–1.8 nm that is duplicated from the graphene oxides in terms of both the lateral size and the shape. It has been found that the C/O functional groups on the GO surface have functioned to promote the oxidation of Co2+ to Co3+, and to transform the β-phase NiCo-hydroxide (NiCo-OH) into the LDH-phase with tuned homogenous composition and geometry. The ultrathin NiCo-LDH nanosheets mimic the morphology and size of the graphene due to the surface-confined and/or surface-guided growth. The as-obtained NiCo-LDH-graphene (NiCo-LDH-G) nanosheets exhibit a superior electrocatalytic activity for oxygen evolution reaction, evidenced by a small overpotential of 0.337 V (@10 mA cm−2 in 0.1 m KOH electrolyte), and a high charge storage capability of 1489 F g−1 as electrodes for supercapacitors. This 2D surface-confined growth strategy may pave a way for the fabrication of ultrathin 2D materials including but not limited to transition metal hydroxides for high-performance electrochemical applications.
Original languageEnglish (US)
JournalAdvanced Functional Materials
Volume28
Issue number44
DOIs
StatePublished - Oct 31 2018
Externally publishedYes

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electronic, Optical and Magnetic Materials

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