Membrane-electrode assemblies(MEA)with a cathode catalyst made of a nickel sodium pectate complex PG-NaNi with a 25% substitution of sodium for nickel,and with a commercial anode catalyst made of platinum black have b...Membrane-electrode assemblies(MEA)with a cathode catalyst made of a nickel sodium pectate complex PG-NaNi with a 25% substitution of sodium for nickel,and with a commercial anode catalyst made of platinum black have been successfully created.Tests in a H_(2)/O_(2) proton exchange membrane fuel cell(PEMFC)yielded the values of the maximum current density of 59 mA cm^(-2) and the maximum power density of 5.9 mW cm^(-2).These results permit the development of environmentally friendly and stable cathode catalysts for PEMFCs made of a readily available biological raw material,pectin.展开更多
The authors regret that there is an error within the Acknowledgments section of the article.The sentence“This research was made possible by an RNF 14-23-00016 grant”is incorrect.The correct version of this sentence ...The authors regret that there is an error within the Acknowledgments section of the article.The sentence“This research was made possible by an RNF 14-23-00016 grant”is incorrect.The correct version of this sentence is shown below.This work was supported by the Russian Science Foundation(grant no.14-23-00016).展开更多
The objects of the investigation were uniformly Ag~＋ doped Hg_（0.76）Cd_（0.24） Te mercury chalcogenide monocrystals obtained by ion implantation with subsequent thermal annealing over 20 days. After implantation a...The objects of the investigation were uniformly Ag~＋ doped Hg_（0.76）Cd_（0.24） Te mercury chalcogenide monocrystals obtained by ion implantation with subsequent thermal annealing over 20 days. After implantation and annealing the conductivity was inverted from n-type with carrier concentration of 10^（16） cm^（-3） to p-type with carrier concentration of ≈ 3.9 × 10^（15） cm^（-3）. The investigations of microwave absorption derivative（d P/d H） showed the existence of strong oscillations in the magnetic field for Ag：Hg_（0.76）Cd_（0.24） Te in the temperature range 4.2–12 K. The concentration and effective mass of charge carrier were determined from oscillation period and temperature dependency of oscillation amplitude. We suppose that this phenomenon is similar to the de Haas–van Alphen effect in weakly correlated electron system with imperfect nesting vector.展开更多
文摘Membrane-electrode assemblies(MEA)with a cathode catalyst made of a nickel sodium pectate complex PG-NaNi with a 25% substitution of sodium for nickel,and with a commercial anode catalyst made of platinum black have been successfully created.Tests in a H_(2)/O_(2) proton exchange membrane fuel cell(PEMFC)yielded the values of the maximum current density of 59 mA cm^(-2) and the maximum power density of 5.9 mW cm^(-2).These results permit the development of environmentally friendly and stable cathode catalysts for PEMFCs made of a readily available biological raw material,pectin.
文摘The authors regret that there is an error within the Acknowledgments section of the article.The sentence“This research was made possible by an RNF 14-23-00016 grant”is incorrect.The correct version of this sentence is shown below.This work was supported by the Russian Science Foundation(grant no.14-23-00016).
文摘The objects of the investigation were uniformly Ag~＋ doped Hg_（0.76）Cd_（0.24） Te mercury chalcogenide monocrystals obtained by ion implantation with subsequent thermal annealing over 20 days. After implantation and annealing the conductivity was inverted from n-type with carrier concentration of 10^（16） cm^（-3） to p-type with carrier concentration of ≈ 3.9 × 10^（15） cm^（-3）. The investigations of microwave absorption derivative（d P/d H） showed the existence of strong oscillations in the magnetic field for Ag：Hg_（0.76）Cd_（0.24） Te in the temperature range 4.2–12 K. The concentration and effective mass of charge carrier were determined from oscillation period and temperature dependency of oscillation amplitude. We suppose that this phenomenon is similar to the de Haas–van Alphen effect in weakly correlated electron system with imperfect nesting vector.
