Electrocatalytic Hydrogen Evolution Reaction on Edges of a Few Layer Molybdenum Disulfide Nanodots

J Benson, M Li, S Wang, P Wang, P Papakonstantinou

Research output: Contribution to journalArticle

145 Citations (Scopus)

Abstract

The design and development of inexpensive highly efficient electrocatalysts for hydrogen production underpins several emerging clean-energy technologies. In this work, for the first time, molybdenum disulfide (MoS2) nanodots have been synthesized by ionic liquid assisted grinding exfoliation of bulk platelets and isolated by sequential centrifugation. The nanodots have a thickness of up to 7 layers (∼4 nm) and an average lateral size smaller than 20 nm. Detailed structural characterization established that the nanodots retained the crystalline quality and low oxidation states of the bulk material. The small lateral size and reduced number of layers provided these nanodots with an easier path for the electron transport and plentiful active sites forthe catalysis of hydrogen evolution reaction (HER) in acidic electrolyte. The MoS2 nanodots exhibited good durability and a Tafel slope of 61 mV dec−1 with an estimated onset potential of −0.09 V vs RHE, which are considered among the best values achieved for 2H phase. It is envisaged that this work may provide a simplistic route to synthesize a wide range of 2D layered nanodots that have applications in water splitting and other energy related technologies.KEYWORDS: MoS2 nanosheets, hydrogen evolution reaction, electrocatalysis, edges, nanodots, ionic liquid exfoliation, water splitting
LanguageEnglish
Pages14113-14122
JournalACS Applied Materials and Interfaces
Volume7
DOIs
Publication statusPublished - 8 Jun 2015

Fingerprint

Ionic Liquids
Hydrogen
Electrocatalysis
Centrifugation
Water
Nanosheets
Electrocatalysts
Hydrogen production
Platelets
Electrolytes
Catalysis
Durability
Crystalline materials
Oxidation
molybdenum disulfide
Electron Transport

Keywords

  • MoS2 nanosheets
  • hydrogen evolution reaction
  • electrocatalysis
  • edges
  • nanodots
  • ionic liquid exfoliation
  • water splitting

Cite this

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title = "Electrocatalytic Hydrogen Evolution Reaction on Edges of a Few Layer Molybdenum Disulfide Nanodots",
abstract = "The design and development of inexpensive highly efficient electrocatalysts for hydrogen production underpins several emerging clean-energy technologies. In this work, for the first time, molybdenum disulfide (MoS2) nanodots have been synthesized by ionic liquid assisted grinding exfoliation of bulk platelets and isolated by sequential centrifugation. The nanodots have a thickness of up to 7 layers (∼4 nm) and an average lateral size smaller than 20 nm. Detailed structural characterization established that the nanodots retained the crystalline quality and low oxidation states of the bulk material. The small lateral size and reduced number of layers provided these nanodots with an easier path for the electron transport and plentiful active sites forthe catalysis of hydrogen evolution reaction (HER) in acidic electrolyte. The MoS2 nanodots exhibited good durability and a Tafel slope of 61 mV dec−1 with an estimated onset potential of −0.09 V vs RHE, which are considered among the best values achieved for 2H phase. It is envisaged that this work may provide a simplistic route to synthesize a wide range of 2D layered nanodots that have applications in water splitting and other energy related technologies.KEYWORDS: MoS2 nanosheets, hydrogen evolution reaction, electrocatalysis, edges, nanodots, ionic liquid exfoliation, water splitting",
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Electrocatalytic Hydrogen Evolution Reaction on Edges of a Few Layer Molybdenum Disulfide Nanodots. / Benson, J; Li, M; Wang, S; Wang, P; Papakonstantinou, P.

In: ACS Applied Materials and Interfaces, Vol. 7, 08.06.2015, p. 14113-14122.

Research output: Contribution to journalArticle

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