Study Of Electrochemical Performance Based On The PDMAEMA Composites

Environment responsive polymer Poly[2-(dimethylamino)ethyl methacrylate](PDMAEMA), containning not only hydrophilic tertiary amine and carbonyl group,but also hydrophobic alkyl group in its structure, which can be protonated in acidic medium, thus it has the characteristics of pH sensitivity and temperature sensitivity of environmental stimulus response. The synthesis of PDMAEMA and its block copolymer has been studied by many people, but the research, especially the electrochemical research based on PDMAEMA composite material combined with inorganic functional materials is rare. Therefore, this paper proposes the concept of preparation PDMAEMA composite materials and explored its electrochemical performance. The main research contents of this paper are as follows:(1) The research of electrocatalysis sodium nitrite(NaNO2) based on diblock copolymer Polyethylene oxide-b-Poly[2-(dimethylamino)ethyl methacrylate](PEO-bPDMAEMA, containing PDMAEMA) combined with multi-walled carbon nanotubes MWCNTs composites: combining the block copolymers PEO-b-PDMAEMA with MWCNTs modified on glassy carbon electrode( denoted as PEO-b-PDMAEMA/MWCNTs/GCE) to build a non-enzymatic electrochemical sensor for measuring nitrite. The impact of PEO-b-PDMAEMA temperature sensitive properties on this sensor was studied. The PEO-b-PDMAEMA/MWCNTs/GCE enhances electrocatalytic properties of the oxidation of nitrite with the solution temperature increasing. The sensor displayed a wide linear range from 1.0×10-6to 1.0×10-4M with a low detection limit of 1.0×10-6 M and a high sensitivity of 562.16 μA/mM·cm2 as well as good stability and repeatability.(2) Preparation of porous carbon materials( NC) based on polymer PDMAEMA and its electrocatalytic for oxygen: Based on C and N elements contained in the PDMAEMA, we select PDMAEMA as carbon source and nitrogen source and KOH as the activating material, N-contained porous carbon material( NC) was pyrolysis synthesized by calcining the PDMAEMA at high temperature. The influence of KOH( with or without) and different calcination temperature influence on the performance of materials was studied. Scanning electron microscope( SEM), X-ray diffraction( XRD) and specific surface analyzer were used to analysise the characteristics of the carbon materials. The results showed that the NC has ahoneycomb like porous structure, surface area up to 954 m2/g and 12.7 wt.% of nitrogen content. The NC modified electrode exhibited high electrocatalytic activity to the cathodic Oxygen Reduction Reaction( ORR), excellent cycle stability and good tolerance to methanol.(3) Preparation of carbon coated magnetic ferroferric oxide nano-particles( C/Fe3O4) composite materials based on polymer PDMAEMA and its electrocatalytic for hydrogen peroxide( H2O2): SEM, EDS, XRD and electrochemical methods were used to characterize and analysis the morphologies and properties of the composites. The results showed that the C/Fe3O4 is spherical nanoparticle with 340 nm diameter and has good electrical conductivity. The electrode modified by C/Fe3O4 showed good electrocatalytic activity to H2O2 with low detection limit( 3.8×10-7M)as well as excellent interference immunity, stability and reproducibility.