Abstract
To meet the global energy demand, it is indeed necessary to develop a suitable renewable energy sources with very high energy efficiency and for this purpose's hydrogen is consider to be the best candidate. Out of various available method of pure hydrogen generation, electrochemical water splitting is considered to be the most effective one which consist of oxygen evolution reaction (OER) at anode and hydrogen evolution reaction (HER) at cathode. Being a four-electron transfer process OER is kinetically sluggish and need more extra potential as compared to thermodynamic potential (1.23 V vs. RHE) as an overpotential without any appropriate catalyst. RuO2 and IrO2 are considered to be state of art catalyst for OER but low abundancy and high cost making their application to be hectic. Recently, various transition metal-based catalyst especially their sulfide and selenide derivative are most effective for the same and even better than the noble metal oxide. Transition metal-based sulfide and selenide got attention for OER owing to their unique electronic structure and electrical conductivity nature. Sulfide and selenide composite materials possess unpremeditated catalytic properties owing to their improved electronic structure which results in better synergistic effects that resulted in improvised electrocatalytic outcomes of the catalyst. This chapter highlights the transition metal-based sulfide and selenide materials in electrochemical OER, mechanism by which transition metal-based catalyst is able to sustain OER and in sighting of reaction progress during OER.
Published Version
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