| Nano-materials have been became the topic for studying and developing functional materialsdue to they, compared with traditional, have special properties in mechanical, electricity,thermology, catalysis and other aspects. Silver nano-materials show wide application in metalnano-materials because of the controllability of its morphology and size and special surfaceproperties. In recent years, it becomes the focus of research on metallic nano-materials. In thisthesis, Ag/XC-72and Ag/CMK-3nano-composite catalysts were synthesized with XC-72andCMK-3as the support respectively. Their structure and electrochemical performance were studied.The details are as follows.(1)Ag/XC-72composite electrode materials were prepared by chemical methodwith sodium citrate monobasic as the complexing agent and low-cost sodiumborohydride as the reducing agent, respectively. The structure of the Ag/XC-72wasstudied. Meanwhile, the molar ratio of sodium citrate manobasic and silver nitratefor catalytic performance of formaldehyde was discussed. The results showed that,the nano-particle size of Ag was uniform and the average size was about20nm.The composite showed the highest electrocatalytic activity and best stability whenthe molar ratio of sodium citrate monobasic and silver nitrate is10:1.(2)Ag/CMK-3catalyst was synthesized through square-wave potential method,and Ag nano-particles were deposited on the surface of CMK-3successfully. Itsstructure and catalytic performance for formaldehyde oxidation were studied.Transmission electron microscopy(TEM) images indicated that the electro-emically synthesized Ag nanoparticles were homogeneously dispersed on thesurface of CMK-3with a mean size50nm. The peak current of Ag/CMK-3canreach to102mA·cm-2, that is about1.4times as many as Ag/XC-72electrodematerial prepared through the same method. The electrocatalytic activity andstability of Ag/CMK-3electrode material was much better than Ag/XC-72. |
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