An investigation was made into polystyrene （PS） grafted onto nanometre silicon carbide （SIC） particles. In our experiment, the grafting polymerization reaction was induced by a radio frequency （RF） inductively c...An investigation was made into polystyrene （PS） grafted onto nanometre silicon carbide （SIC） particles. In our experiment, the grafting polymerization reaction was induced by a radio frequency （RF） inductively coupled plasma （ICP） treatment of the nanometre powder. FTIR （Fourier transform infrared spectrum） and XPS （X-ray photoelectron spectroscopy） results reveal that PS is grafted onto the surface of silicon carbide powder. An analysis is presented on the effectiveness of this approach as a function of plasma operating variables including the plasma treating power, treating time, and grafting reaction temperature and time.展开更多
Plasma sputtering deposition techniques are good candidates for the fabrication of electrodes used for direct methanol fuel cells （DMFCs）. A house-made plasma sputtering system was used to deposit platinum of 0.1 mg...Plasma sputtering deposition techniques are good candidates for the fabrication of electrodes used for direct methanol fuel cells （DMFCs）. A house-made plasma sputtering system was used to deposit platinum of 0.1 mg/cm^2 onto un-catalyzed gas diffusion layers （GDLs） to form a Pt catalyzed cathode at different radio frequency （RF） powers and sputtering-gas pressures. The sputtered cathodes were assembled in custom-made membrane electrode assemblies （MEAs） with a commercial anode and tested for the electrical performance of the single cell. A custommade MEA with a sputtering prepared cathode was compared with that of a reference membrane electrode assembly made of commercial JM （Johnson Mattey） catalysts （Pt loading per electrode of 0.5 mg/cm^2） under passive methanol supply, ambient temperature and air-breathing conditions. The results showed that the cathode prepared at an input power of 110 W and sputtering-gas pressure of 5.3 Pa exhibited the best cell performance and highest Pt utilization efficiency, which was due to the miniaturization of the Pt particles and formation of the porous catalyst layer. Although the single cell performance of the commercial cathode was better than all the sputtering fabricated cathodes, the Pt utilization efficiency of all the sputtered cathodes was higher than that of the commercial cathode.展开更多
Anodes used for direct methanol fuel cells （DMFCs） were fabricated by magnetron sputtering process. A house-made plasma sputtering system was used to deposit Pt and PtRu onto un-catalyzed gas diffusion layers （GDLs...Anodes used for direct methanol fuel cells （DMFCs） were fabricated by magnetron sputtering process. A house-made plasma sputtering system was used to deposit Pt and PtRu onto un-catalyzed gas diffusion layers （GDLs） at different radio frequency （RF） powers and sputtering- gas pressures. The thin film catalyst layers were characterized by X-ray diffraction, energy dis- persive X-ray analysis, and X-ray photoelectron spectroscopy. The sputtered anodes were assem- bled in custom-made membrane electrode assemblies （MEAs） with a commercial cathode and the electrical performance of the single cell were tested under passive methanol supply, ambient tern- perature and air-breathing conditions. The electrochemical performance of the anodes prepared with PtRu alloy was compared with a reference anode sputtered with Pt only. X-ray diffraction and X-ray photoelectron spectroscopy revealed that platinum and ruthenium existed as a form of alloy. The cell polarization measurements showed that all the PtRu alloy catalysts had better electrochemical performance than the Ptl catalyst, and the Pto.n3Ruo.57 catalyst achieved the best performance.展开更多
In this paper,a novel diiron ethane-1,2-dithiolate complex[Fe2(CO)4{κ2-(Ph2P)2(1,2-C6H4)}(μ-SCH2CH2S)]has been prepared and structurally characterized.Treatment of the parent complex[Fe2(CO)6(μ-SCH2CH2S)]with 1 equ...In this paper,a novel diiron ethane-1,2-dithiolate complex[Fe2(CO)4{κ2-(Ph2P)2(1,2-C6H4)}(μ-SCH2CH2S)]has been prepared and structurally characterized.Treatment of the parent complex[Fe2(CO)6(μ-SCH2CH2S)]with 1 equivalent of 1,2-bis(diphenylphosphino)benzene and Me3NO?2H2O as the oxidative agent gave the title complex in good yield.The title complex has been characterized by elemental analysis,IR,1H NMR,31P{1H}NMR,13C{1H}NMR spectroscopy,and X-ray crystallography.X-ray crystal structure of the title complex contains a butterfly diiron cluster with a bridging ethane-1,2-dithiolate,four terminal carbonyls,and a chelating 1,2-bis(diphenylphosphino)benzene.In addition,electrochemical studies revealed that the title complex can catalyze the reduction of protons to H2 in the presence of acetic acid.展开更多
文摘An investigation was made into polystyrene （PS） grafted onto nanometre silicon carbide （SIC） particles. In our experiment, the grafting polymerization reaction was induced by a radio frequency （RF） inductively coupled plasma （ICP） treatment of the nanometre powder. FTIR （Fourier transform infrared spectrum） and XPS （X-ray photoelectron spectroscopy） results reveal that PS is grafted onto the surface of silicon carbide powder. An analysis is presented on the effectiveness of this approach as a function of plasma operating variables including the plasma treating power, treating time, and grafting reaction temperature and time.
基金supported by National Natural Science Foundation of China (No. 10975162)the Principal Foundation of Institute of Plasma PhysicsChinese Academy of Sciences (No. 095GZ1156Y)
文摘Plasma sputtering deposition techniques are good candidates for the fabrication of electrodes used for direct methanol fuel cells （DMFCs）. A house-made plasma sputtering system was used to deposit platinum of 0.1 mg/cm^2 onto un-catalyzed gas diffusion layers （GDLs） to form a Pt catalyzed cathode at different radio frequency （RF） powers and sputtering-gas pressures. The sputtered cathodes were assembled in custom-made membrane electrode assemblies （MEAs） with a commercial anode and tested for the electrical performance of the single cell. A custommade MEA with a sputtering prepared cathode was compared with that of a reference membrane electrode assembly made of commercial JM （Johnson Mattey） catalysts （Pt loading per electrode of 0.5 mg/cm^2） under passive methanol supply, ambient temperature and air-breathing conditions. The results showed that the cathode prepared at an input power of 110 W and sputtering-gas pressure of 5.3 Pa exhibited the best cell performance and highest Pt utilization efficiency, which was due to the miniaturization of the Pt particles and formation of the porous catalyst layer. Although the single cell performance of the commercial cathode was better than all the sputtering fabricated cathodes, the Pt utilization efficiency of all the sputtered cathodes was higher than that of the commercial cathode.
基金supported by National Natural Science Foundation of China (No.10975162)the Principal Foundation of Institute of Plasma Physics, Chinese Academy of Sciences (No.095GZ1156Y)
文摘Anodes used for direct methanol fuel cells （DMFCs） were fabricated by magnetron sputtering process. A house-made plasma sputtering system was used to deposit Pt and PtRu onto un-catalyzed gas diffusion layers （GDLs） at different radio frequency （RF） powers and sputtering- gas pressures. The thin film catalyst layers were characterized by X-ray diffraction, energy dis- persive X-ray analysis, and X-ray photoelectron spectroscopy. The sputtered anodes were assem- bled in custom-made membrane electrode assemblies （MEAs） with a commercial cathode and the electrical performance of the single cell were tested under passive methanol supply, ambient tern- perature and air-breathing conditions. The electrochemical performance of the anodes prepared with PtRu alloy was compared with a reference anode sputtered with Pt only. X-ray diffraction and X-ray photoelectron spectroscopy revealed that platinum and ruthenium existed as a form of alloy. The cell polarization measurements showed that all the PtRu alloy catalysts had better electrochemical performance than the Ptl catalyst, and the Pto.n3Ruo.57 catalyst achieved the best performance.
基金supported by the Natural Science Foundation of Zhejiang Province(LY19B020002)National Natural Science Foundation of China(21501124)+2 种基金Science&Technology Department of Sichuan Province(2018JY0235)Education Department of Sichuan Province(18ZA0337)Sichuan University of Science&Engineering(S201910622022)。
文摘In this paper,a novel diiron ethane-1,2-dithiolate complex[Fe2(CO)4{κ2-(Ph2P)2(1,2-C6H4)}(μ-SCH2CH2S)]has been prepared and structurally characterized.Treatment of the parent complex[Fe2(CO)6(μ-SCH2CH2S)]with 1 equivalent of 1,2-bis(diphenylphosphino)benzene and Me3NO?2H2O as the oxidative agent gave the title complex in good yield.The title complex has been characterized by elemental analysis,IR,1H NMR,31P{1H}NMR,13C{1H}NMR spectroscopy,and X-ray crystallography.X-ray crystal structure of the title complex contains a butterfly diiron cluster with a bridging ethane-1,2-dithiolate,four terminal carbonyls,and a chelating 1,2-bis(diphenylphosphino)benzene.In addition,electrochemical studies revealed that the title complex can catalyze the reduction of protons to H2 in the presence of acetic acid.
