Nanoporous Nitrogen-Doped Graphene Oxide/Nickel Sulfide Composite Sheets Derived from a Metal-Organic Framework as an Efficient Electrocatalyst for Hydrogen and Oxygen Evolution

Kolleboyina Jayaramulu, Justus Masa, Ondrej Tomanec, Daniel Peeters, Vaclav Ranc, Andreas Schneemann, Radek Zboril, Wolfgang Schuhmann, Roland A. Fischer

Research output: Contribution to journalArticlepeer-review

223 Scopus citations

Abstract

Engineering of controlled hybrid nanocomposites creates one of the most exciting applications in the fields of energy materials and environmental science. The rational design and in situ synthesis of hierarchical porous nanocomposite sheets of nitrogen-doped graphene oxide (NGO) and nickel sulfide (Ni7S6) derived from a hybrid of a well-known nickel-based metal-organic framework (NiMOF-74) using thiourea as a sulfur source are reported here. The nanoporous NGO/MOF composite is prepared through a solvothermal process in which Ni(II) metal centers of the MOF structure are chelated with nitrogen and oxygen functional groups of NGO. NGO/Ni7S6 exhibits bifunctional activity, capable of catalyzing both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) with excellent stability in alkaline electrolytes, due to its high surface area, high pore volume, and tailored reaction interface enabling the availability of active nickel sites, mass transport, and gas release. Depending on the nitrogen doping level, the properties of graphene oxide can be tuned toward, e.g., enhanced stability of the composite compared to commonly used RuO2 under OER conditions. Hence, this work opens the door for the development of effective OER/HER electrocatalysts based on hierarchical porous graphene oxide composites with metal chalcogenides, which may replace expensive commercial catalysts such as RuO2 and IrO2.

Original languageEnglish
Article number1700451
JournalAdvanced Functional Materials
Volume27
Issue number33
DOIs
StatePublished - 6 Sep 2017

Keywords

  • electrocatalysis
  • metal-organic framework (MOF)
  • nanosheets
  • nickel sulfide
  • nitrogen-doped graphene oxide

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