In-situ growth of graphene decorated Ni 3 S 2 pyramids on Ni foam for high-performance overall water splitting

Jing Yu, Yue Du, Qianqian Li, Liang Zhen, Vinayak P. Dravid, Jinsong Wu*, Cheng Yan Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Rational design of high-performance electrocatalysts with low cost and large abundance is highly desirable for water splitting technology. Here we report the synthesis of Ni 3 S 2 pyramids coated with crimped graphene (Ni 3 S 2 @G), the unique configuration of which endows Ni 3 S 2 @G with large roughness, creating much more active sites along the edges. Moreover, the coupling of graphene enhances the electrical conductivity of the nanocomposite, and thus improves the electrocatalytic activity due to synergistic effect between graphene and Ni 3 S 2 . Ni 3 S 2 @G hybrid shows outstanding performance toward both hydrogen evolution reactions (HER) and oxygen evolution reactions (OER) with low overpotentials (η 10 = 103 mV for HER and η 20 = 294 mV for OER) and small Tafel slope. Ni 3 S 2 @G electrode also exhibits superior full water splitting ability with a low cell voltage of 1.66 V.

Original languageEnglish (US)
Pages (from-to)772-779
Number of pages8
JournalApplied Surface Science
Volume465
DOIs
StatePublished - Jan 28 2019

Keywords

  • Electrocatalyst
  • Graphene
  • Nickel sulphide
  • Synergistic effect
  • Water splitting

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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