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Size-Dependent Enhancement of Electrocatalytic Oxygen-Reduction and Hydrogen-Evolution Performance of MoS2 Particles

Wang, T, Gao, D, Zhuo, J, Zhu, Z, Papakonstantinou, P, Y, Li and M, Li (2013) Size-Dependent Enhancement of Electrocatalytic Oxygen-Reduction and Hydrogen-Evolution Performance of MoS2 Particles. Chemistry A European Journal, 19 . pp. 11939-11948. [Journal article]

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URL: http://onlinelibrary.wiley.com/doi/10.1002/chem.201301406/abstract

DOI: DOI: 10.1002/chem.201301406

Abstract

MoS2 particles with different size distributions were prepared by simple ultrasonication of bulk MoS2 followed by gradient centrifugation. Relative to the inert microscale MoS2, nanoscale MoS2 showed significantly improved catalytic activity toward the oxygen-reduction reaction (ORR) and hydrogen-evolution reaction (HER). The decrease in particle size was accompanied by an increase in catalytic activity. Particles with a size of around 2 nm exhibited the best dual ORR and HER performance with a four-electron ORR process and an HER onset potential of −0.16 V versus the standard hydrogen electrode (SHE). This is the first investigation on the size-dependent effect of the ORR activity of MoS2, and a four-electron transfer route was found. The exposed abundant Mo edges of the MoS2 nanoparticles were proven to be responsible for the high ORR catalytic activity, whereas the origin of the improved HER activity of the nanoparticles was attributed to the plentiful exposed S edges. This newly discovered process provides a simple protocol to produce inexpensive highly active MoS2 catalysts that could easily be scaled up. Hence, it opens up possibilities for wide applications of MoS2 nanoparticles in the fields of energy conversion and storage.Keywords: electrocatalysis · hydrogen production · molybdenum Sulfide nanoparticles · oxygen reduction reaction

Item Type:Journal article
Keywords:hydrogen production, oxygen reduction reaction, catalysis, molybdenum sulfides, 2D nanomaterials
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:26732
Deposited By: Professor Pagona Papakonstantinou
Deposited On:29 Aug 2013 13:59
Last Modified:17 Oct 2017 16:10

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