Straw Cement Base Composite Material Performance Research

With the fast-speed development of nanotechnology,precious metal nanoparticles show great value for its large surface area,numerous of surface atoms and valence unsaturated surface atoms in the field of electrochemical catalysis and other fields show great value.As for the research status of noble metal Pt nanoparticles as catalyst,the expensive price,high loading and high polarization potential greatly limit its commercial development.Supported Pd based catalysts have good catalytic properties compareded with Pt with lower cost.This paper studied chemicalelectro catalytic performance through the regulation of carrier type,catalyst composition,morphology,size,content of palladium and other factors to control the activity of catalyst,the specific contents are as follows:1 The C/Pd nanoparticles with different Pd content?20,30 and 40%?are successfully prepared by a simple ethylene glycol reduction method.The structure and morphology of the composites are characterized by XRD,XPS and TEM.The results show that Pd nanoparticles are successfully supported on XC-72 carbon carrier,the particles are uniformly dispersed and no aggregation phenomenon.It shows that the catalyst has the best electrocatalytic activity when the Pd content was 30% by using cyclic voltammetry?CV?and differential pulse voltammetry?DPV?characterization of the prepared sample of ascorbic acid?AA?,dopamine?DA?and uric acid?UA?under neutral conditions.CV curves show that the oxidative peak differences of AA,DA and UA are 219 mV?DA-AA?,106 m V?UA-DA?and 325 mV?UA-AA?respectively,indicating that AA,DA and UA can be detected simultaneously.In the differential pulse voltammetric detection,DA-AA,UA-DA and UA-AA peak difference reached 215 mV,129 mV and 344 mV,which makes C/Pd become a catalyst for simultaneous detection of AA,DA and UA's good choice.2 We prepared Activated carbon supported palladium/nickel phosphide?C/Ni₂P/Pd?nanocomposites by two step method and study the electrocatalytic performance of the modified glassy carbon electrode.It shows that Pd,Ni₂ P nanoparticles are successfully supported on XC-72 carbon carrier,and the particles are dispersed uniformly and have a particle size of about 2⁵ nm by characterizing the structure,morphology and element distribution with XRD,XPS,TEM and EDX.C/Ni₂P/Pd modified electrode exhibits excellent electrocatalytic activity for hydrogen peroxide?H2O2?,working voltage as low as-0.5V,with fast amperometric response time?3s?,high sensitivity,wide Linear range?0.25 35 mM?,detection limit of 0.05 mM.In addition,C/Ni₂P/Pd nano-materials modified electrode also showed good reproducibility,stability and anti-interference.3 Three-dimensional graphene?3D GE?modified bimetallic PtPd nanoparticle composites were prepared by one-step method and used as electrochemical detection of H2O2.The morphology and structure of 3D GE/PtPd composites were analyzed by SEM and Raman spectroscopy.It shows that the 3D GE/PtPd complexes are assembled into three-dimensional pore structures by graphene sheets,and PtPd nanoparticles Evenly distributed on the 3D GE surface.The electrochemical performance of 3D GE/PtPd complexes are investigated by CV and chrono-current behavior.The linear detection range is 0.25².0 mM?R = 0.993?and the sensitivity is 219.6 ?A mM^-1cm^-1.