scholarly journals Oxygen deficient perovskites: effect of structure on electrical conductivity, magnetism and electrocatalytic activity.

2019 ◽  
Author(s):  
Ram Hona
Keyword(s):  
Electrical Conductivity ◽  
Electrocatalytic Activity ◽  
Effect Of Structure

ChemInform Abstract: EFFECT OF STRUCTURE ON THE ELECTRICAL CONDUCTIVITY OF SELENIUM

1982 ◽  
Vol 13 (42) ◽  
Author(s):  
K. E. MURPHY ◽  
B. B. WUNDERLICH ◽  
B. WUNDERLICH
Keyword(s):  
Electrical Conductivity ◽  
Effect Of Structure

Biotemplated synthesis of bark-structured TiC nanowires as Pt catalyst supports with enhanced electrocatalytic activity and durability for methanol oxidation

2014 ◽  
Vol 2 (21) ◽  
pp. 8003-8008 ◽  
Author(s):  
Zhen Qiu ◽  
Hui Huang ◽  
Jun Du ◽  
Xinyong Tao ◽  
Yang Xia ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Methanol Oxidation ◽  
Electrocatalytic Activity ◽  
Electrochemical Stability ◽  
Pt Catalyst ◽  
Catalyst Supports ◽  
High Electrical Conductivity ◽  
One Dimensional ◽  
Electrocatalytic Properties ◽  
Excellent Chemical

Unique one-dimensional bark-structured TiC NWs possessing high electrical conductivity, excellent chemical/electrochemical stability and enhanced electrocatalytic properties were synthesised.

Carbon Nanotubes-Supported Pt Electrocatalysts for O2 Reduction Reaction—Effect of Number of Nanotube Walls

2020 ◽  
Vol 20 (5) ◽  
pp. 2736-2745 ◽  
Author(s):  
Haohua Kuang ◽  
Yi Cheng ◽  
Cheng Qiang Cui ◽  
San Ping Jiang
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Electrocatalytic Activity ◽  
Supported Catalysts ◽  
Polymer Electrolyte Membrane ◽  
Pt Nanoparticles ◽  
Outer Wall ◽  
Reduction Reaction ◽  
O2 Reduction ◽  
Walled Cnts

Carbon nanotubes (CNTs) are one of the most common catalysts supports for the development of electrocatalysts for O2 reduction reaction (ORR) of electrochemical devices such as polymer electrolyte membrane fuel cells (PEMFCs) and metal-air batteries due to their high electrical conductivity and high stability. In addition to the electrical conductivity and stability, the number of inner tubes or walls also influence the electrocatalytic activity of the supported catalysts. Here we study the electrocatalytic activity of Pt nanoparticles (NPs) supported on CNTs (Pt/CNTs) as a function of number of walls towards ORR in both alkaline and acid solutions. The results indicate that the mechanism of ORR on Pt/CNTs does not change with the number of walls of CNTs support but the number of walls of CNTs supports has a significant effect on the electrocatalytic activity of supported Pt NPs. Pt NPs supported on double-walled CNTs (DWCNTs) exhibit a much better activity for ORR, as compared with that supported on single-walled and multi-walled CNTs (SWCNTs and MWCNTs). The high electrocatalytic activity of DWCNTs-supported Pt NPs is contributed to the fast electron transfer between the outer wall and inner tubes of DWCNTs for ORR through electron tunnelling process under the electrochemical polarization driving force.

Effect of structure on the electrical conductivity of selenium

1982 ◽  
Vol 86 (15) ◽  
pp. 2827-2835 ◽  
Author(s):  
K. E. Murphy ◽  
B. B. Wunderlich ◽  
Bernhard Wunderlich
Keyword(s):  
Electrical Conductivity ◽  
Effect Of Structure

scholarly journals DEVELOPMENT AND RESEARCH OF ELECTROCATALYTIC SYSTEMS FOR ELECTRODES OF SOLID-OXIDE HYDROGEN-AIR FUEL CELLS

2021 ◽  
pp. 4-10
Author(s):  
M. K. Skakov ◽  
A. M. Zhilkashinova ◽  
S. K. Kabdrakhmanova ◽  
M. E. Seitkanova ◽  
E. Shaimardan ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Hydrogen Peroxide ◽  
Electronic Structure ◽  
Fuel Cell ◽  
Bimetallic Catalysts ◽  
Electrocatalytic Activity ◽  
Experimental Studies ◽  
Solid Oxide ◽  
Membrane Electrode ◽  
Qualitative And Quantitative

The article describes the results of experimental studies on the development of new active electrocatalysts for their use in the electrodes of the membrane-electrode block of a solid-oxide hydrogen-air fuel cell. Since the composition of the synthesized catalysts has a significant effect on its electrokinetic activity (electrical conductivity), the synthesis of nanoscale bimetallic catalysts of various qualitative and quantitative compositions is carried out. The choice of metal for the synthesis of the catalyst was determined by its electronic structure. The electrocatalytic activity of the developed catalysts was evaluated by studying the activity of the catalysts with respect to the decomposition of hydrogen peroxide. The developed bimetallic PVPD-Pt/ZnO/C catalysts exhibit activity with respect to the decomposition of hydrogen peroxide at 40–50 °C.

The effect of structure on the low-temperature electrical conductivity of carbon nanocomposite temperature sensors

2019 ◽  
Vol 45 (10) ◽  
pp. 1104-1108
Author(s):  
V. V. Vainberg ◽  
A. S. Pylypchuk ◽  
V. N. Poroshin ◽  
Yu. N. Gudenko ◽  
A. S. Nikolenko
Keyword(s):  
Electrical Conductivity ◽  
Low Temperature ◽  
Temperature Sensors ◽  
Carbon Nanocomposite ◽  
Effect Of Structure

scholarly journals Tellurium-Doped, Mesoporous Carbon Nanomaterials as Transparent Metal-Free Counter Electrodes for High-Performance Bifacial Dye-Sensitized Solar Cells

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 29 ◽  
Author(s):  
Chang Ki Kim ◽  
Jung-Min Ji ◽  
Haoran Zhou ◽  
Chunyuan Lu ◽  
Hwan Kyu Kim
Keyword(s):  
Electrical Conductivity ◽  
Solar Cells ◽  
Electrocatalytic Activity ◽  
Mesoporous Carbon ◽  
Carbon Nanomaterials ◽  
Dye Sensitized Solar Cells ◽  
Counter Electrodes ◽  
High Doping Level ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Tellurium-doped, mesoporous carbon nanomaterials with a relatively high doping level were prepared by a simple stabilization and carbonization method in the presence of a tellurium metalloid. A transparent counter electrode (CE) was prepared using tellurium-doped, mesoporous carbon (TeMC) materials, and was directly applied to bifacial, dye-sensitized solar cells (DSSCs). To improve the performance of the bifacial DSSC device, CEs should have outstanding electrocatalytic activity, electrical conductivity, and electrochemical stability, as well as high transparency. In this study, to make transparent electrodes with outstanding electrocatalytic activity and electrical conductivity, various TeMC materials with different carbonization temperatures were prepared by simple pyrolysis of the polyacrylonitrile-block-poly (n-butyl acrylate) (PAN-b-PBA) block copolymer in the presence of the tellurium metalloid. The electrocatalytic activity of the prepared TeMC materials were evaluated through a dummy cell test, and the material with the best catalytic ability was selected and optimized for application in bifacial DSSC devices by controlling the film thickness of the CE. As a result, the bifacial DSSC devices with the TeMC CE exhibited high power conversion efficiencies (PCE), i.e., 9.43% and 8.06% under front and rear side irradiation, respectively, which are the highest values reported for bifacial DSSCs to date. Based on these results, newly-developed transparent, carbon-based electrodes may lead to more stable and effective bifacial DSSC development without sacrificing the photovoltaic performance of the DSSC device.

Removing Substrate Background in TEM Microanalysis

1974 ◽  
Vol 32 ◽  
pp. 568-569
Author(s):  
John C. Russ ◽  
Nicholas C. Barbi
Keyword(s):  
Electrical Conductivity ◽  
Rapid Growth ◽  
Organic Film ◽  
Absolute Concentration ◽  
Background Signal ◽  
X Ray ◽  
Elemental Concentrations ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
The Continuum

The rapid growth of interest in attaching energy-dispersive x-ray analysis systems to transmission electron microscopes has centered largely on microanalysis of biological specimens. These are frequently either embedded in plastic or supported by an organic film, which is of great importance as regards stability under the beam since it provides thermal and electrical conductivity from the specimen to the grid.Unfortunately, the supporting medium also produces continuum x-radiation or Bremsstrahlung, which is added to the x-ray spectrum from the sample. It is not difficult to separate the characteristic peaks from the elements in the specimen from the total continuum background, but sometimes it is also necessary to separate the continuum due to the sample from that due to the support. For instance, it is possible to compute relative elemental concentrations in the sample, without standards, based on the relative net characteristic elemental intensities without regard to background; but to calculate absolute concentration, it is necessary to use the background signal itself as a measure of the total excited specimen mass.

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