Preparation Of Pt,Pd Based Catalysts And The Study Of Their Electrochemical Activity For The Hydrogen Evolution Reaction In Basic Media

Hydrogen is a clean fuel,and its evolution from electrocatalytic water splitting has attracted growing attention as a promising method.Electrocatalytic water splitting is made of oxygen evolution reaction?OER?and hydrogen evolution reaction?HER?.The OER is more difficult to occur in acid or neutral media than in alkaline media.The electrolytic equipment and electrode can be corroded easily by hydrogen ion.Therefore,most eldectrocatalytic water splitting reaction occur under alkaline media.However,the rate of hydrogen evolution reaction kinetics is slow in basic media.Thus,high activity and low overpotential of the catalyst for HER is particularly important.The most effective HER electrocatalysts are Pt and Pt-based materials.Nevertheless,the high cost and limited resource have largely hindered their practical applications in commercial scales.In this paper,platinum-based catalyst and non-platinum catalyst were prepared to improve catalytic activity with reduced content of Pt for HER in basic media.There were few reports of the disordered and ordered structure in the Pt based catalyst.The ordered structure was obtained by high temperature annealing from disordered stuture,the appearance of superlattice peak proved the ordered structure had been prepared successfully.With a combination of physical characterizations and electrochemical analysis,it was proved that the catalytic performance of binary alloy was better than Pt/C catalyst via the electronic effect.The catalytic performance of the disordered structure was better than ordered structure.The electrochemical activity surface area?ECSA?test showed that the Pt of the disordered structure,exposing more active sites and enhancing the catalytic activity for HER,had larger area than the Pt of the ordered structure.Pd has been considered as one of the best replacement metal for Pt due to its high catalytic activity for HER.Oxide-supported metal has been studied for many important reactions.Despite the certain progress,the study on the interface interaction between noble metal and metal oxide for HER has been rarely reported so far.Therefore,Pd/CeO₂/C hybrid was prepared by chemical deposition and reduction method.Then the electrochemical performance of Pd/CeO₂/C hybrid was studied and compared with Pd/C,CeO₂/C,a physical mixture of Pd/C and CeO₂/C.In addition,strong coupling interaction between Pd and CeO₂ nanoparticles catalysts was characterized and investigated by various spectroscopic and microscopic techniques.The conceptual design of Pd/CeO₂/C catalyst prepared in commercial scale will be achieved,considering the simple synthesis method and a small content of noble metal.