The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
M Von Bradke - One of the best experts on this subject based on the ideXlab platform.
-
innovative production procedure for low cost pefc Electrodes and Electrode membrane structures
International Journal of Hydrogen Energy, 1998Co-Authors: D Bevers, N Wagner, M Von BradkeAbstract:As production cost will be one of the main challenges for the commercialization of fuel cells, a new approach to Electrode production and Electrode-membrane-Electrode (EME) structure production for polymer electrolyte fuel cells (PEFC) has been considered. Electrodes are produced by a modified rolling process that was formerly used for the production of Electrodes for alkaline fuel cells or batteries. This rolling process has been adapted to the specific demand of PEFC Electrodes. The Electrodes were analyzed via cyclic voltammetry (CV), impedance and effective exchange current density (the geometrical exchange current) measurements. The comparison of these Electrodes with commercially available E-Tek Electrodes shows the same power output. This paper gives an overview of the ongoing research on these Electrode production technologies.
-
Innovative production procedure for low cost PEFC Electrodes and Electrode/membrane structures
International Journal of Hydrogen Energy, 1998Co-Authors: D Bevers, N Wagner, M Von BradkeAbstract:As production cost will be one of the main challenges for the commercialization of fuel cells, a new approach to Electrode production and Electrode-membrane-Electrode (EME) structure production for polymer electrolyte fuel cells (PEFC) has been considered. Electrodes are produced by a modified rolling process that was formerly used for the production of Electrodes for alkaline fuel cells or batteries. This rolling process has been adapted to the specific demand of PEFC Electrodes. The Electrodes were analyzed via cyclic voltammetry (CV), impedance and effective exchange current density (the geometrical exchange current) measurements. The comparison of these Electrodes with commercially available E-Tek Electrodes shows the same power output. This paper gives an overview of the ongoing research on these Electrode production technologies.
Hubert A Gasteiger - One of the best experts on this subject based on the ideXlab platform.
-
proton conduction in pem fuel cell cathodes effects of Electrode thickness and ionomer equivalent weight
Journal of The Electrochemical Society, 2010Co-Authors: Chunxin Ji, Daniel R Baker, Wenbin Gu, Jacob Jorne, Hubert A GasteigerAbstract:The dependence of Electrode proton resistivity on Electrode thickness, Pt loading, ionomer loading, and ionomer equivalent weight (EW) in proton exchange membrane (PEM) fuel cell cathodes was investigated using a Pt/Vulcan catalyst. For uniform Electrodes, the Electrode proton resistivity is independent of the Electrode thickness and Pt loading but depends on the ionomer loading and ionomer EW. There is a strong dependence on the ionomer EW when the ionomer/carbon weight (I/C) ratio is lower than 0.8. The Electrode proton resistivity strongly depends on relative humidity (RH) and the density of ―SO 3 H groups in the Electrode. The Electrode proton resistivity becomes nearly independent of ionomer EW in Electrodes when high I/C ratios are used. At low I/C ratios and low RH levels, Electrodes with 850 EW ionomer exhibit better performance than those with 1050 EW. On the contrary, 850 EW Electrodes give lower performance under overhumidified conditions due to Electrode flooding.
-
dependence of Electrode proton resistivity on Electrode thickness and ionomer equivalent weight in cathode catalyst layer in pem fuel cell
Meeting Abstracts, 2008Co-Authors: Chunxin Ji, Daniel R Baker, Wenbin Gu, Jacob Jorne, Hubert A GasteigerAbstract:developed to predict Electrode performance can be used in a wide range of Electrodes and Electrode thicknesses. Since the equivalent weight (EW) of the ionomer affects its proton conductivity, using ionomers with different EW and measuring their corresponding Electrode’s proton resistance can give us a better understanding of the impact of the ionomer bulk proton resistivity on the Electrode proton resistivity. While previous Electrodes were made of 1050 EW ionomer, the present work employed Electrodes made of an ionomer with lower EW. Lower Electrode proton resistivities are expected for the Electrodes made of low EW ionomers. H cath R ,
D Bevers - One of the best experts on this subject based on the ideXlab platform.
-
innovative production procedure for low cost pefc Electrodes and Electrode membrane structures
International Journal of Hydrogen Energy, 1998Co-Authors: D Bevers, N Wagner, M Von BradkeAbstract:As production cost will be one of the main challenges for the commercialization of fuel cells, a new approach to Electrode production and Electrode-membrane-Electrode (EME) structure production for polymer electrolyte fuel cells (PEFC) has been considered. Electrodes are produced by a modified rolling process that was formerly used for the production of Electrodes for alkaline fuel cells or batteries. This rolling process has been adapted to the specific demand of PEFC Electrodes. The Electrodes were analyzed via cyclic voltammetry (CV), impedance and effective exchange current density (the geometrical exchange current) measurements. The comparison of these Electrodes with commercially available E-Tek Electrodes shows the same power output. This paper gives an overview of the ongoing research on these Electrode production technologies.
-
Innovative production procedure for low cost PEFC Electrodes and Electrode/membrane structures
International Journal of Hydrogen Energy, 1998Co-Authors: D Bevers, N Wagner, M Von BradkeAbstract:As production cost will be one of the main challenges for the commercialization of fuel cells, a new approach to Electrode production and Electrode-membrane-Electrode (EME) structure production for polymer electrolyte fuel cells (PEFC) has been considered. Electrodes are produced by a modified rolling process that was formerly used for the production of Electrodes for alkaline fuel cells or batteries. This rolling process has been adapted to the specific demand of PEFC Electrodes. The Electrodes were analyzed via cyclic voltammetry (CV), impedance and effective exchange current density (the geometrical exchange current) measurements. The comparison of these Electrodes with commercially available E-Tek Electrodes shows the same power output. This paper gives an overview of the ongoing research on these Electrode production technologies.
Kwang Suk Park - One of the best experts on this subject based on the ideXlab platform.
-
reverse curve arch shaped dry eeg Electrode for increased skin Electrode contact area on hairy scalps
Electronics Letters, 2015Co-Authors: Jeong Su Lee, Chungmin Han, Jee-hoon Kim, Kwang Suk ParkAbstract:Electroencephalography (EEG) is electrical brain activity that can be measured on the scalp with Ag/AgCl Electrodes and conductive gel. However, time-consuming preparation procedures, dehydration of the gel, and skin irritation are crucial drawbacks of using such Electrodes. Alternative approaches involving the use of spiky dry Electrodes have their own drawbacks such as limited skin–Electrode contact area, high skin–Electrode impedance, and pain. Reverse-curve-arch-shaped dry EEG Electrodes for use in increasing the skin–Electrode contact area on hairy scalps are presented. The proposed Electrode was fabricated from sterling silver using a three-dimensional printer. To increase the contact area between the skin and an Electrode, an Electrode was designed to have reverse-curve arches which were arranged in a row on the Electrode base. The curvature of the arches was designed to match the curvature of the scalp to maximise the contact area and disperse the pressing force. To validate the proposed Electrode design, comparison experiments for EEG and skin–Electrode contact impedance were conducted, and the proposed Electrode was found to perform better than a commercially available finger-type dry Electrode.
-
Reverse-curve-arch-shaped dry EEG Electrode for increased skin–Electrode contact area on hairy scalps
Electronics Letters, 2015Co-Authors: Jeong Su Lee, Chungmin Han, Jee-hoon Kim, Kwang Suk ParkAbstract:Electroencephalography (EEG) is electrical brain activity that can be measured on the scalp with Ag/AgCl Electrodes and conductive gel. However, time-consuming preparation procedures, dehydration of the gel, and skin irritation are crucial drawbacks of using such Electrodes. Alternative approaches involving the use of spiky dry Electrodes have their own drawbacks such as limited skin–Electrode contact area, high skin–Electrode impedance, and pain. Reverse-curve-arch-shaped dry EEG Electrodes for use in increasing the skin–Electrode contact area on hairy scalps are presented. The proposed Electrode was fabricated from sterling silver using a three-dimensional printer. To increase the contact area between the skin and an Electrode, an Electrode was designed to have reverse-curve arches which were arranged in a row on the Electrode base. The curvature of the arches was designed to match the curvature of the scalp to maximise the contact area and disperse the pressing force. To validate the proposed Electrode design, comparison experiments for EEG and skin–Electrode contact impedance were conducted, and the proposed Electrode was found to perform better than a commercially available finger-type dry Electrode.
Hideo Hosono - One of the best experts on this subject based on the ideXlab platform.
-
application of 12cao 7al2o3 electride as a new Electrode for superoxide ion generation and hydroxylation of an arylboronic acid
Electrochemistry Communications, 2012Co-Authors: Jiang Li, Shinsuke Inagi, Toshio Fuchigami, Hideo HosonoAbstract:Abstract 12CaO•7Al 2 O 3 (C12A7) electride, which exhibits metallic conduction and 2.4 eV work function, can be used as an electron emitter and chemical reagent. Herein we reveal a new application for C12A7 electride as Electrode in electrochemical reactions. Cathodic reduction of oxygen at C12A7 Electrode in acetonitrile generates superoxide ions (O 2 •− ) using Bu 4 NClO 4 as a supporting electrolyte. Iodometry reveals that this Electrode shows a higher yield of O 2 •− ions than conventional Electrodes such as Pt and glassy carbon. Moreover, O 2 •– ion–induced hydroxylation of p -(methylthio)phenylboronic acid using C12A7 Electrode gives the corresponding phenol derivative with a yield of 90% at the charge apply of 2.5 F·mol − 1 .
-
52 3 a use of electrically conductive oxide ceramic 12cao 7al2o3 electride Electrode having low work function and low sputtering yield for fluorescent lamps
SID Symposium Digest of Technical Papers, 2011Co-Authors: Naomichi Miyakawa, Toshinari Watanabe, Satoru Watanabe, Hideo Hosono, Shigeo MikoshibaAbstract:A significantly low cathode fall voltage of 140 V and a high sputtering resistance at the driving current as large as 20 mA were observed for the cold cathode fluorescent lamps that comprise the ceramic cathode Electrodes made of 12CaO·7Al2O3 electride. The electride is a subnanoporous compound having a work function of 2.4 eV and electrical conductivity of 1670 S/m. The Electrode was also found to be applicable to hot cathodes for glow and arc discharges.
