Enhancement of electrochemical and catalytic properties of MoS2 through ball-milling |
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| Institution: | 1. Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore;2. Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Czech Republic;1. Department of Mechanical Engineering, Chungnam National University, Daejeon 305-764, South Korea;2. Department of Chemistry, Yeungnam University, Gyeongsan, Gyeongbuk 712-749, South Korea;3. School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang, Gyeonggi-do 412-791, South Korea;4. Advanced Propulsion Technology Center, Agency for Defense Development, Daejeon 305-152, South Korea |
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| Abstract: | MoS2 nanosheets of one to few layer thickness present novel electronic and enhanced catalytic properties with respect to the bulk material. Here we show that a simple and highly scalable ball-milling procedure can lead to significant improvements of the electrochemical and catalytic properties of the bulk natural MoS2. We characterized the material before and after the milling process by means of scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy in order to evaluate morphological and chemical features. We investigated the electrochemical properties by means of voltammetry techniques to monitor the electron transfer with Fe(CN)6]4 −/3 − redox probe and the catalytic properties by monitoring the electrochemical hydrogen evolution reaction (HER). A significant overpotential lowering of about 210 mV is obtained for the HER by the ball-milled material when compared to bulk materials. This has a huge potential for the lowering of the energy consumption during hydrogen evolution. Ball-milling offers highly scalable dry method for large scale production of electrocatalyst with enhanced properties. |
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