Study On Solube Conjugated Polymers As Oxygen Reduction Catalysts

Due to the high energy conversion efficiency,environment friendly and high reliability advantages of fuel cell.It has become a substitute of conventional fossil fuel energy conversion device.But the shortage resources and expensive of cathode oxygen reduction catalyst for fuel cell,hindered the marketization of the fuel cell.As a result,preparation of new type catalysts which have high efficient,stability and cheap properties for oxygen reduction become the main content of the fuel cell research at present.Based on the study of the factors of carbon carrier,nitrogen containing catalyst precursor and non-noble metal which effect the catalytic activity of catalyst,this article mainly introduced three carbon（vulcan XC-72）supported nitrogen-containing non-noble metal polymer（M-N_x/C）as the catalysts for oxygen reduction reaction.Through the electronic scanning electron microscope（SEM）,X-ray photoelectron spectroscopy（XPS）,UV-vis absorption spectroscopy（UV）,infrared spectroscopy（IR）and thermogravimetric（TG）et al measurements analyzed the physical properties of the catalysts.Using cyclic voltammetry（CV）,linear sweep voltammetry（LSV）,rotating ring-disk electrode（RRDE）measurements tested the electrical catalytic properties of the catalysts.Based on the data of the yield of H₂O₂ and the electron transfer number to understand the catalytic activity of catalysts,furthermore,through the dynamics analysis verify the electron transfer way of oxygen reduction reaction.（1）Adopt by chemical polymerization synthetic nitrogen containing polymer marked as PBBDP then polymer load on the carbon powder to form PBBDP/C catalyst,and further introduction of copper ions for preparation of Cu-PBBDP/C catalyst.According by physical characterization,electrochemical tests and dynamic analysis compared the catalytic activity of the two kinds of catalysts.It can be obtained that the introduction of copper ion obviously improved the oxygen reduction catalytic activity.Furthermore,comparing the catalytic ability of Cu-PBBDP/C,commercial Pt/C（20 %）and the same type catalyst had been reported can concluded that the electron transfer number（ETN）and H₂O₂ production of Cu-PBBDP/C were similar to Pt/C（20 %）.It is a high performance catalyst.（2）Synthesis a monomer containing carbazole unit and 1,10-phenanthroline unit,then through the coordination effect of copper ion to form the supramolecular polymer Cu-OCBP.Carbon black was selected as a carrier for preparing Cu-OCBP/C catalyst.Through a series of physical characterization and electrochemical characterization analysis,and compared some electrochemical parameters with commercial Pt/C（20 %）catalyst and the same type catalysts in literature found that although the catalytic activity of Cu-OCBP/C lower than Pt/C（20 %）but compared with other same type catalyst still has great advantage.（3）Through the reaction between fourth generation amine-terminated poly（amidoamine）PAMAM dendrimers（G4-NH₂）（Dendritech）and 1,10-Phenanthroline-5-carboxylic acid to synthesis catalyst precursor marked as PAMAMPhen.Then prepare PAMAMPhen-Cu/C and PAMAMPhen/C catalysts.According by physical characterization,electrochemical characterization and kinetic analysis indicated that the catalytic activity of PAMAMPhen-Cu/C is superior to that of PAMAMPhen/C,and it is comparable to Pt/C（20 %）.