A new highly selective thiocyanate PVC membrane electrode based on bisbebzoin-semitriethylenetetraamine binuclear cobalt(Ⅱ) metallic complex [Co(Ⅱ) 2-BBSTA] as neutral carrier is reported, which displays an anti-Hof...A new highly selective thiocyanate PVC membrane electrode based on bisbebzoin-semitriethylenetetraamine binuclear cobalt(Ⅱ) metallic complex [Co(Ⅱ) 2-BBSTA] as neutral carrier is reported, which displays an anti-Hofmeister selectivity sequence. The electrode exhibits Nernstian potential linear range to thiocyanate from 1.0×10 -1 to 1.0×10 -6 mol/L with a detection limit 8.0×10 -7 mol/L and a slope of -52.0 mV/dec in phosphorate buffer solution of pH=5.0 at 25 ℃. The response mechanism is discussed in view of the a.c. impedance technique and the UV spectroscopy technique. The electrode based on binuclear cobalt(Ⅱ) compound was used to determine the thiocyanate content in waste water with satisfactory results.展开更多
A miniaturized H 2/air self-breathing proton exchange membrane fuel cell(μPEMFC) was designed and fabricated with 1 cm 2 active area. All the basic parts of a conventional H 2/air PEMFC were incorporated in a smaller...A miniaturized H 2/air self-breathing proton exchange membrane fuel cell(μPEMFC) was designed and fabricated with 1 cm 2 active area. All the basic parts of a conventional H 2/air PEMFC were incorporated in a smaller and simpler package. The electrodes of the μPEMFC were constructed on silicon wafer substrates by means of standard micro electromechanical systems (MEMS) techniques. The obtained results show that the peak power density of a single cell has exceeded 110 mW/cm 2 when it was operated in ambient atmosphere at 20 ℃. Furthermore, the cells can yield over 400 W/L specific power density.展开更多
It is reported for the first time that the Pt - Ru/C catalyst was prepared with the solid phase reaction method.Cyclic voltammetric measurements indicated that the anodic peak potential of ethanol at the electrode wit...It is reported for the first time that the Pt - Ru/C catalyst was prepared with the solid phase reaction method.Cyclic voltammetric measurements indicated that the anodic peak potential of ethanol at the electrode with the Pt - Ru/C catalyst prepared with the solid phase reaction method was0.54V and the peak current was100mA · cm -2 .While the anodic peak potential and peak current were0.64V and43mA · cm -2 respectively at the Pt - Ru/C catalyst prepared with the traditional liquid phase reaction method.It illustrated that the electrocatalytic activity of the Pt - Ru/C catalyst prepared with the solid phase reaction method was much better than that of the Pt - Ru/C catalyst prepared with the traditional liquid phase reaction method.It is because the Pt - Ru/C catalyst prepared with the solid phase reaction method is of low crystallinity and high dispersivity.展开更多
文摘A new highly selective thiocyanate PVC membrane electrode based on bisbebzoin-semitriethylenetetraamine binuclear cobalt(Ⅱ) metallic complex [Co(Ⅱ) 2-BBSTA] as neutral carrier is reported, which displays an anti-Hofmeister selectivity sequence. The electrode exhibits Nernstian potential linear range to thiocyanate from 1.0×10 -1 to 1.0×10 -6 mol/L with a detection limit 8.0×10 -7 mol/L and a slope of -52.0 mV/dec in phosphorate buffer solution of pH=5.0 at 25 ℃. The response mechanism is discussed in view of the a.c. impedance technique and the UV spectroscopy technique. The electrode based on binuclear cobalt(Ⅱ) compound was used to determine the thiocyanate content in waste water with satisfactory results.
文摘A miniaturized H 2/air self-breathing proton exchange membrane fuel cell(μPEMFC) was designed and fabricated with 1 cm 2 active area. All the basic parts of a conventional H 2/air PEMFC were incorporated in a smaller and simpler package. The electrodes of the μPEMFC were constructed on silicon wafer substrates by means of standard micro electromechanical systems (MEMS) techniques. The obtained results show that the peak power density of a single cell has exceeded 110 mW/cm 2 when it was operated in ambient atmosphere at 20 ℃. Furthermore, the cells can yield over 400 W/L specific power density.
文摘It is reported for the first time that the Pt - Ru/C catalyst was prepared with the solid phase reaction method.Cyclic voltammetric measurements indicated that the anodic peak potential of ethanol at the electrode with the Pt - Ru/C catalyst prepared with the solid phase reaction method was0.54V and the peak current was100mA · cm -2 .While the anodic peak potential and peak current were0.64V and43mA · cm -2 respectively at the Pt - Ru/C catalyst prepared with the traditional liquid phase reaction method.It illustrated that the electrocatalytic activity of the Pt - Ru/C catalyst prepared with the solid phase reaction method was much better than that of the Pt - Ru/C catalyst prepared with the traditional liquid phase reaction method.It is because the Pt - Ru/C catalyst prepared with the solid phase reaction method is of low crystallinity and high dispersivity.
