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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

18 Scopus Citations
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Author(s)

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

Detail(s)

Original languageEnglish
Article number1803272
Journal / PublicationAdvanced Functional Materials
Volume28
Issue number44
Early online date14 Sep 2018
Publication statusPublished - 31 Oct 2018
Externally publishedYes

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.

Research Area(s)

  • graphene-guided growth, NiCo-layered double hydroxides, oxygen evolution reaction, supercapacitors, ultrathin nanosheets

Citation Format(s)

Surface‐Confined Fabrication of Ultrathin Nickel Cobalt‐Layered Double Hydroxide Nanosheets for High‐Performance Supercapacitors. / Yang, Juan; Yu, Chang; Hu, Chao; Wang, Man; Li, Shaofeng; Huang, Huawei; Bustillo, Karen; Han, Xiaotong; Zhao, Changtai; Guo, Wei; Zeng, Zhiyuan; Zheng, Haimei; Qiu, Jieshan.

In: Advanced Functional Materials, Vol. 28, No. 44, 1803272, 31.10.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review