Controlled Phase and Porosity of Cobalt Disulfide Nanoparticles through Metal-Organic Frameworks As Efficient Bifunctional Electrocatalysts for Overall Water Splitting

摘要

With growing demands for sustainable energy sources, hydrogen energy is receiving great attention due to their abundant, eco-friendly, and renewable nature. Although water electrolysis is most promising technologies for hydrogen production, it is currently obstructed by the sluggish kinetic of oxygen evolution reaction (OER) compared with hydrogen evolution reaction (HER). Furthermore, according to the demand for simplicity and cost effectiveness of electrolysis, the need for bifunctional electrocatalysts which operate in the same electrolyzer, is rapidly increasing. The cubic pyrite-phase transition metal dichalcogenides, such as FeS_2, NiS_2, and CoS_2, have been proposed as candidates for bifuctional electrocatalysts. Among them, CoS_2 has been reported to exhibit high conductivity and high activity for HER and OER in strong alkaline condition.