Study On Preparation And Electrocatalytic Performance Of Fe-Pd-P Nanoporous Alloys

Recently,nanoporous materials have gotten much attention in the field of new materials.Among these nanoporous materials,nanoporous metal materials with 3-D homogeneous network structures have the characteristics of high specific surface area and special surface boundary and have great potential applications in catalysis,sensors,capacitors and other fields.At present,the preparation methods for nano porous metal materials include dealloying,template method and so on.Compared with the other methods,the dealloying process is simple,convenient,efficient and easy to achieve industrial production.However,the dealloying method requires that the precursor should have a single phase alloy,which greatly limits the range of the multicomponent alloy systems suitable for dealloying.In addition,fuel cell mainly uses Pt based electrode catalytic materials in the field of new energy,but Pt has low storage and high price.The research and development of the catalysts without Pt is very necessary.Therefore,in this study,a new type of multicomponent nanoporous catalytic material is prepared by dealloying the Fe-Pd-P amorphous alloy precursor with homogeneous and unseparated components.Fe60Pd20P20 amorphous alloy ribbons with 2 mm in width and 25 ?m in thick were first prepared by vacuum melt-spinning.The structure of Fe60Pd20P20 ribbons was completely amorphous by the characterization of SEM?EDS?XRD and DSC.Then,the amorphous alloys were used as the precursors,and the nanoporous materials were prepared by chemical dealloying and electrochemical dealloying.The morphology observation and composition change analysis for these nanoporous materials ware carried out by SEM and EDS.Finally,the electrochemical activity and catalytic performance of nanoporous materials were tested by using cyclic voltammetry.The effects of dealloying process,time and constant potential on the morphology and composition of nanoporous materials and thereof their effects on the electrochemical activity and electrocatalytic performance of nanoporous materials were investigated.The results are showed as follows:(1)Fe60Pd20P20 amorphous alloy ribbons with uniform composition and 2 mm in width and 25 ?m in thick were successfully prepared by vacuum melt-spinning.(2)The Fe60Pd20P20 amorphous alloy was used as precursor for electrochemical dealloying in 1 mol/L H2SO4 at 25?,and the nanoporous alloy materials with three-dimensional pore sizes of 30?60nm and ligament(hole boundary)size of 10 nm were successfully prepared.(3)Compared with the Fe60Pd20P20 amorphous alloy ribbon precursor,all the nanoporous alloy materials after dealloying effectively improved the electrochemical and electrocatalytic properties.Among these nanoporous alloy materials,the material obtained by dealloying for 2h at constant potential of 0.72V showed a shift to 0.35V for the oxidation peak of formic acid and an increase of current density by 34 times in 0.5mol/L H2S04 + 0.5mol/L HCOOH solution at 25?.(4)The effects of dealloying constant potential and time on the morphology and composition of nanoporous materials and thereof the effects on electrochemical activity and catalytic performance were analyzed.When the dealloy constant potential wss in the dissolving area,the electrocatalytic performances of the materials were obviously improved with dealloying time increasing.In this project,Fe-Pd-P amorphous alloy was used as the precursor alloy to prepare multicomponent nanoporous catalytic materials with electrocatalytic properties,which broadens the applicable alloy ranges by dealloying method and promotes the research and application of Pd-based nanoporous materials in catalytic field.