|Subject||Professor Shanmugam Suggests Electrode with High Activity&Stability for Hydrogen Fuel Generation|
Professor Shanmugam Suggests Electrode with High Activity&Stability for Hydrogen Fuel Generation
Professor Sangaraju Shanmugam(Department of Energy Systems Engineering, DGIST) and his research team have developed a highly active and stable electrode for hydrogen fuel generation from water at cheaper rate, and proposed it as a key electrode material to replace the precious metal catalysts entirely.
Currently, hydrogen is one of the strongest alternative fuels to fulfill international energy demand. Therefore, researchers try to produce hydrogen from various sources at cheaper rate. Water splitting is the most proficient approach to produce mass and pure hydrogen from earth abundant source of H2O. But the major issue is cost, due to the scarcity of precious metal catalyst and their stability limitations.
Professor Sangaraju Shanmugam described the direct growth of one-dimensional (1D) NiCo2S4 nanowire arrays on three-dimensional (3D) Ni foam current collector as an efficient bifunctional electrocatalyst for overall water splitting with excellent activity and stability.
The use of 3D-Ni foam has several advantages. When a catalyst is directly attached on the current collector, it can reduce the contact resistance and enhance the electron pathways through circuit. Furthermore, the NiCo2S4 band gap is more favorable towards both oxygen and hydrogen evolution reactions, because it needs less external energy to start the reactions.
This new approach and development of non-precious bi-functional electrode is one of the promising ways to reduce the overall cost of water electrolysis system. Furthermore, it will shorten the requirement for diverse equipment and processes towards preparation of electrodes for effective solar light assisted hydrogen generation.
Professor Shanmugam explained that the concurrent improvements in bifunctional overpotential and superior stability of the in situ, inexpensive, earth-abundant electrocatalyst enables the preparation of alkaline water electrolyzer with solar panel for large scale solar-to-hydrogen generation. And the water electrolyzer affords the efficient hydrogen evolution at the overpotential lower than that of other commercial electrocatalyst and the developed know-how process will be transferred to an industry for mass production of hydrogen fuel.
His latest achievement was published a prestigious materials science journal, Advanced Functional Materials(online), on April 9(Wed) 2016.
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