Research Of Metal Oxide Electrodeposition Based On Triphase Interface And Its Applications

By adjusting surface energy and multiscale micro/nanostructures of solid surface,superwetting interfaces posessing unique wettability have been extensively studied.Fundamental understandings gained from superwetting interfaces boost the control of wettability under different dimensionalities,such as one dimensional(1D)fibers,two dimensional(2D)surfaces,and three dimensional(3D)architectures,thus permitting manipulation of the transport physics of liquids,gases,and ions,which profoundly impacts chemical reactions and material fabrication.Superwettability science has greatly enhanced the efficiency of chemical reactions,including photocatalytic,electrochemical,bioelectronic,and organic catalytic reactions,by realizing efficient mass transport.The research in this paper mainly includes:Part Ⅰ,a microporous carbon fiber substrate was first subjected to poly(tetrafluoroethylene)(PTFE)treatment,then possessing superhydrophobic characteristic for 2D mesoporous ZnO nanosheets preparation.When such electrode immersed in an aqueous electrolyte,an air-liquid-solid triphase interface is formed because of the air pockets trapped at the electrode/electrolyte interface.Abundant oxygen(O2)in air phase can transport directly to electrochemical reactive sites,thus getting rid of the dependence on the traditional oxygen source materials in liquid phase.By using a superhydrophobic electrode,regular 2D mesoporous ZnO nanosheets can be obtained in a green(benign)route.Part Ⅱ,2D mesoporous ZnO nanosheets prepared on the triphase interface were then used as photocatalysts to degrade pollutants(rhodanine B,RhB)in water.In the air-liquid-Solid photocatalytic system,sufficient O2 at the interface can be supplied directly from the air phase,which can efficiently remove photogenerated electrons from the surface of the photocatalysts,thereby suppressing the electron-hole pairs recombination to improve the efficiency of photocatalysis.Part Ⅲ,by using 2D mesoporous ZnO nanosheets prepared on the triphase interface as H2O2 electrocatalysts,glucose oxidase(GOx)was immobilized on ZnO-modified triphase electrode by a crosslinking method.Due to the advantage of triphase interface possessing sufficient O2,thus the "oxygen deficit" problem of first-generation biosensor was solved successfully.