The Preparation Of Mo-based Compounds Nanomaterials And The Applications In Electrochemical Catalysis

Hydrogen is a promising future energy carrier that holds great promise for clean and sustainable energy technology.Toward this end,one effective approach of hydrogen production is the environmentally friendly electrochemical water-splitting.It is reported that the electrochemical hydrogen evolution reaction（HER）generally requires advanced electro catalysts with a high current density at a low overpotential.The most effective electro catalysts for HER are based on Pt-group metals,whose large scale applications of Pt catalysts have been restricted due to high cost and low abundance.Molybdenum sulfide featuring unique electronic and optical properties are found to be an active nonmetallic HER catalyst,which is potentially useful for acidic HER condition with abundant protons.In this article,we put forward three effective ways to improve the electro catalytic activity of MoS₂.Pd nanoparticles modified MoS₂ Nano flowers assembled by lamellar Nano sheets have been successfully synthesized by a facile hydrothermal method.It was found that Pd modified MoS₂ without calculated treatment exhibited high HER activity.The HER activity of this catalyst can be improved after visible-light irradiation.Ordered Mesoporous Carbonic Arrays were filled by MoS₂ ultrathin Nano sheets forming the hybrid catalyst.Carbon substrate offer fluent charge transport pathway directly connecting Mo Sx catalyst and external electrochemical electrodes.The HER activity of this catalyst can be improved at the initial period.Taking advantage of the synergistic structure,the hybrid catalyst in present work exhibits outstanding HER catalytic activity with an overpotential of-40 m V,which could be the lowest value among MoS₂-Carbon electro catalysts.In order to enhance the HER activity,we successfully incorporated tungsten in MoS₂ catalysts,leading to more disordered structure.The disordered structure can offer abundant unsaturated sulfur atoms as active sites for HER.This kind of MoS₂ catalysts exhibited superior activity for electro catalytic hydrogen evolution.In addition,Molybdenum dioxide was seldom investigated in the OER activities.We opened up new possibilities of the oxygen evolution reaction applications for Molybdenum oxide.Three-dimensionally ordered macroporous Mo O2 coupled by carbon skeleton was synthesized successfully by a novel template method,proving that the template directed method is a promising candidate for enhancing the specific activity for oxygen evolution reaction.More specifically,the spinel-type cobalt oxide was successfully introduced in the whole structure.