Synthesis Of Au,Pd Supported Nanomaterials And Their Electrochemical Performance In Biosensor And Fuel Cell

Chemically Modified Electrodes?CMEs?mainly through physical or chemical methods to appropriately modify the electrode surface that has received extensive attention in the field of current electrochemical research,due to their expected functions,such as accelerating electron transfer reaction,selective membrane penetration,preferential enrichment,high selectivity,sensitivity and stability.It breaks through the scope of traditional electrochemistry,which only focuses on the research of bare electrode/electrolyte interface,and facilitated the surface structure of human controlled electrode.Because of their unique properties,chemically modified electrodes are widely used in the life science,environmental science,analytical science and other fields,which has attracted more and more attention from electrochemistry workers.Because of the unique properties in optics,electrics and magnetics,more and more noble metal nanomaterials are applied to our real life,such as electronic products,medical equipment,and national defense science and technology.Taking advantage of the excellent electrical properties,the noble metal nanomaterials can be used to prepare modified functional electrodes that exhibited outstanding electrochemnical performances in the biosensor application owing to the good sensitivity and selectivity.Herein,two kinds of noble metal nanomaterials modified electrodes were synthesized,and were applied for electrochemical sensors and electrochemical catalysis:1)A novel electrochemical aptamer-based sensor for the detection of tobramycin was prepared,using differential pulse voltammetry?DPV?as a detection technique and methylene blue as an electrochemical indicator.carbon electrode was used.AuNPs/PANI/TNTs was characterized by transmission electron microscopy and x-ray photoelectron spectroscopy in detail,suggesting the 4 nm Au nanoparticles was uniformly deposited onto the surface of PANI/TNTs,which is beneficial to enhancing biocompatibility and electrochemical performance of Au nanoparticles.The results of cyclic voltammetry and electrochemical impedance measurements demonstrated that the AuNPs/PANI/TNTs nanocomposites can improve greatly the electron transfer on the interface.For the detection of tobramycin,the DPV results showed a good linear relationship between the current response and the concentration of tobramycin,and there was a wide range of detection from 0.5?M to 70?M.As a result,the presented aptamer-based biosensor has shown excellent sensitivity and reproducibility,which would be a potential application in bioanalysis and clinical diagnostics.2)A two dimensional CoP NSs was synthesized by a facile method,and the functionalized amino ionic liquid?NH₂-IL?was used to modify CoP NSs to improve the dispersivity.The positively charged NH₂-IL can also be adsorbed with negatively charged PdCl₄^2-,and thensodium borohydride solution was added to PdCl₄^2-and the reductive Pd anchored on surface of CoP NSs.The morphology and elemental states of the composite nanomaterials were characterized by field emission scanning electron microscopy?SEM?and X ray energy spectrum analysis?EDS?,indicating that Pd nanoparticles were uniformly anchored on surface of CoP NSs.Comparing with Pd/CoP NSs instead of NH₂-IL modified Pd/CoP NSs,CV test results showed that NH₂-IL modified Pd-IL/CoP NSs exhibited excellent electrocatalytic activity and better long-term stability compared.The electrochemical current density of Pd-IL/CoP NSs toward methanol oxidation is 6.52 times as high as that of Pd/CoP NSs,and the current density for ethanol oxidation is 6.13 times that of Pd/CoP NSs.The enhanced electrochemical performance is mainly attributed to the small particle size of Pd and the interaction between Pd and CoP.The research provides a certain guiding significance for the electrochemical application of two dimensional structures.