The Low Platinum/Transition Metal Compound Composites In The Application Of Hydrogen Evolution Reaction

The problems of environmental pollution have become more and more serious,with the development of the times.Hydrogen is considered as a clean alternative to fossil fuels,and water electrolysis is a green method for hydrogen production,the key to optimizing this method is to develop a suitable electrocatalyst.To date,the most effective electrocatalysts for the hydrogen evolution reaction（HER）are Pt and its alloys,but the high cost and scarcity of Pt remains an obstacle to its widespread application.Therefore,the development of low Pt loading or Pt-free catalysts with excellent properties remains an important goal.This paper mainly studies the synthesis of composite materials with low noble metal content by sacrificial counter-electrode method and the electrochemical performance for HER.The main contents are as follows:（1）Molybdenum sulfide/carbon nanotubes/Pt composite catalyst（MoS_x/CNTs/Pt）was synthesized on the base of molybdenum sulfide/carbon nanotubes composite material with platinum wire as the sacrificial counter-electrode.The morphology of the catalyst was characterized by SEM and TEM,and it was found that Pt particles were uniformly deposited on the surface of molybdenum sulfide.The electrochemical test results show that the composite has good properties of HER.In addition,DFT theoretical calculation is used to further explore the reasons why composite materials can enhance HER performance.（2）A small-sized molybdenum sulfide was synthesized on the suface of carbon nanotubes,and palladium wire was used as a counter electrode.The Pd/O co-doped molybdenum sulfide(Sub-MoS_x/CNTs/Pd_gly)was synthesized by an upgraded sacrificial counter electrode method.The morphology of the catalyst was characterized by SEM and TEM.It was found that the Pd/O co-doped molybdenum sulfide was uniformly distributed on the carbon nanotubes.The results of electrochemical tests show that the composite has excellent hydrogen production performance in electrolyzed water,which is consistent with the predicted results of DFT theoretical calculation.