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Title: 2-Dimentional Transition Metal Dichalcogenides for Efficient Hydrogen Evolution Reaction

K. Jeganathan

Bharathidasan University, India

Biography

Dr. K. Jeganathan has received his Ph.D degree from Anna University, Chennai in 1999. Then he was awarded Science and Technology Agency (STA)  Fellowship, Govt. of Japan  (2000-2002) to work on III-Nitrides by rf-MBE at  AIST, Tsukuba, Japan and then continued to work in the same laboratory as a AIST researcher (Tenure Track) for developing AlGaN and InAlN based HEMT structure on SiC substrates by MBE. In 2006, he relocated to Forsungcentrum, Juelich, Germany as Alexander von Humboldt fellow to develop self-assembled III-nitride nanowires on Silicon substrates by MBE. At present, he is Professor at School of Physics, Bharathidasan University, Tiruchirappalli. His current research interest includes fabrication and characterization of GaN and InGaN nanowires, Graphene, TMDC (MoS2, NbS2 etc) for photovoltaic and water splitting applications. He is the author/co-author of 115 peer reviewed regular articles.

Abstract

Hydrogen is an energy carrier, has the ability to address the increasing global energy demand and alternate to depleting fossil fuels. Harvesting hydrogen gas via electrocatalytic and photoelectrocatalytic (PEC) water splitting approach is widely established owing to its low production cost, straight forward processing and high efficiency with low operational voltage. However, the efficiency of water splitting is ultimately relying on the choice of electrode materials which should be reliable for the commercial implementation. Till date, rare metals such as Pt known to be the best hydrogen evolution reaction (HER) catalyst. However, the finite source and high cost limits its commercial viability. On the other hand, in recent years, the 2D transition metal dichalcogenide (TMDC) materials such as Molybdenum disulphide (MoS2), Niobium disulphide (NbS2) are shown to exhibit superior HER catalytic activity. The 2D TMDC materials possess the prerequisite properties such as near zero Gibbs free energy, excellent acid stability and ultra-high active sulphur sites for superior HER performance. Here, we discuss and demonstrate the TMDC based HER cathodes for superlative performance in both PEC and EC water splitting approach. The graphene/MoS2 vertical nansosheets as electro-cathode displays very low turn on potential (-188 mV vs. RHE), ultra-high device stability in continuous test and withstands over 150 days. The vertical MoS2/graphene structure accomplishes three orders of enhanced performance than its bulk layered counter parts. Further, the search for new hybrid electrodes by the integration of NbS2 with MoS2/graphene and silicon nanowires for both electro- and photo-catalytic applications will be extensively discussed.

Audience take away:

• The audience friendly presentation will provide a clear understanding of how the electro and photocatalytic experiments using new form of electrodes would improve the performance of water splitting. 
• TMDC based water splitting on flexible substrate and TMDC/Si NW devices for advanced future HER and issues associated with commercial water splitting will also be highlighted.