The likely goal of nanotectulology is the integration of individual nanodevices into a nanosystem, which includes the nanodevice（s）, power harvesting unit, data processing logic system, and possibly wireless communi...The likely goal of nanotectulology is the integration of individual nanodevices into a nanosystem, which includes the nanodevice（s）, power harvesting unit, data processing logic system, and possibly wireless communication unit. A nanosystem requires a nanoscale power source to make the entire package extremely small and high performance. The nanofuel and nanobiofuel cells developed here represent a new self-powering approach in nanotechnology, and their power output is high enough to drive nanodevices for performing self-powered sensing. This study shows the feasibility of building self-powered nanosystems for biological sciences, environmental monitoring, defense technology and even personal electronics.展开更多
Sulfonated polyether ether ketone (SPEEK) with variou s degree of sulfonation (DS) were synthesized by reaction of PEEK with sulfo nic acid as sulfonating agent and solvent.Their proton conductivity and methanol pe rm...Sulfonated polyether ether ketone (SPEEK) with variou s degree of sulfonation (DS) were synthesized by reaction of PEEK with sulfo nic acid as sulfonating agent and solvent.Their proton conductivity and methanol pe rmeability as a function of the degree of sulfonation were investigated.For 46 .71% DS,proton conductivity was 1.68×10 -2S/cm at 80℃ and 4.25×10 -2S/cm at 100℃,which is closed to or superior to that of Nafion 115 me mbrane at the same conditions.Methanol permeability of SPEEK was considerable s maller than that of Nafion 115 membrane.Because of their high conductivity and low methanol permeability,SPEEK membranes appear to be excellent candidate for use in DMFC applications.展开更多
A novel inorganic-organic composite membrane based on sulfonated polyether ether ketone(SPEEK) with embedded phosphotungstic acid(PWA) for direct methanol fuel cells(DMFC) was prepared. IR spectra results indicate tha...A novel inorganic-organic composite membrane based on sulfonated polyether ether ketone(SPEEK) with embedded phosphotungstic acid(PWA) for direct methanol fuel cells(DMFC) was prepared. IR spectra results indicate that PWA was kept in SPEEK matrix as the Keggin structure. From SEM micrograph, it could be found that the solid PWA were well mixed with SPEEK matrix and showed no agglomeration in the membrane. Proton conductivity of the PWA/SPEEK composite membrane is higher than that of pure SPEEK membrane, and is similar or superior to that of Nafion ○R 115 membrane in the temperature range 80—110 ℃. Methanol permeability of the PWA/SPEEK membrane was considerably smaller than that of Nafion ○R 115 membrane. Because of its high conductivity and low methanol permeability, the PWA/SPEEK membrane seems to be an excellent candidate for DMFC applications.展开更多
基金Acknowledgements The authors thank the National Program on key Basic Research Project （973 Program）, the Chinese National Natural Science Foundation, and the National Centre for Nanoscience and Technology of China for support. This work made use of the resources of the Beijing National Center for Electron Microscopy.
文摘The likely goal of nanotectulology is the integration of individual nanodevices into a nanosystem, which includes the nanodevice（s）, power harvesting unit, data processing logic system, and possibly wireless communication unit. A nanosystem requires a nanoscale power source to make the entire package extremely small and high performance. The nanofuel and nanobiofuel cells developed here represent a new self-powering approach in nanotechnology, and their power output is high enough to drive nanodevices for performing self-powered sensing. This study shows the feasibility of building self-powered nanosystems for biological sciences, environmental monitoring, defense technology and even personal electronics.
文摘Sulfonated polyether ether ketone (SPEEK) with variou s degree of sulfonation (DS) were synthesized by reaction of PEEK with sulfo nic acid as sulfonating agent and solvent.Their proton conductivity and methanol pe rmeability as a function of the degree of sulfonation were investigated.For 46 .71% DS,proton conductivity was 1.68×10 -2S/cm at 80℃ and 4.25×10 -2S/cm at 100℃,which is closed to or superior to that of Nafion 115 me mbrane at the same conditions.Methanol permeability of SPEEK was considerable s maller than that of Nafion 115 membrane.Because of their high conductivity and low methanol permeability,SPEEK membranes appear to be excellent candidate for use in DMFC applications.
文摘A novel inorganic-organic composite membrane based on sulfonated polyether ether ketone(SPEEK) with embedded phosphotungstic acid(PWA) for direct methanol fuel cells(DMFC) was prepared. IR spectra results indicate that PWA was kept in SPEEK matrix as the Keggin structure. From SEM micrograph, it could be found that the solid PWA were well mixed with SPEEK matrix and showed no agglomeration in the membrane. Proton conductivity of the PWA/SPEEK composite membrane is higher than that of pure SPEEK membrane, and is similar or superior to that of Nafion ○R 115 membrane in the temperature range 80—110 ℃. Methanol permeability of the PWA/SPEEK membrane was considerably smaller than that of Nafion ○R 115 membrane. Because of its high conductivity and low methanol permeability, the PWA/SPEEK membrane seems to be an excellent candidate for DMFC applications.
