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Self-standing,hybrid three-dimensional-porous MoS2/Ni3S2 foam electrocatalyst for hydrogen evolution reaction in alkaline medium |
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| Authors: | R Narasimman Manmohansingh Waldiya Jalaja K Suresh K Vemuri Indrajit Mukhopadhyay Abhijit Ray |
| Affiliation: | 1. Advanced Power Systems Division, Chemical Systems Group, Propellants, Polymers, Chemicals and Materials Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram, Kerala, 695 022, India;2. Solar Research and Development Centre, Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, 382 335, India;3. Material Characterisation Division, Material Characterisation and Testing Group, Materials and Metallurgy Group, Materials and Metallurgy Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram, Kerala, 695 022, India;4. Department of Solar Energy, Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, 382 335, India |
| Abstract: | Self-standing and hybrid MoS2/Ni3S2 foam is fabricated as electrocatalyst for hydrogen evolution reaction (HER) in alkaline medium. The Ni3S2 foam with a unique surface morphology results from the sulfurization of Ni foam showing a truncated-hexagonal stacked sheets morphology. A simple dip coating of MoS2 on the sulfurized Ni foam results in the formation of self-standing and hybrid electrocatalyst. The electrocatalytic HER performance was evaluated using the standard three-electrode setup in the de-aerated 1 M KOH solution. The electrocatalyst shows an overpotential of 190 mV at ?10 mA/cm2 with a Tafel slope of 65.6 mV/dec. An increased surface roughness originated from the unique morphology enhances the HER performance of the electrocatalyst. A density functional approach shows that, the hybrid MoS2/Ni3S2 heterostructure synergistically favors the hydrogen adsorption-desorption steps. The hybrid electrocatalyst shows an excellent stability under the HER condition for 12 h without any performance degradation. |
| Keywords: | Hydrogen evolution reaction DFT |
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