The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
L.a. Coldren - One of the best experts on this subject based on the ideXlab platform.
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Low-Temperature Operation of vertical cavity surface-emitting lasers
IEEE Photonics Technology Letters, 1995Co-Authors: E. Goobar, C. Mahon, F.h. Peters, M.g. Peters, L.a. ColdrenAbstract:Vertical cavity surface-emitting lasers originally designed for room Temperature Operation are operated at 77 K. At this Temperature, the gain peak and the cavity mode do not overlap. However, due to joule heating, at high biasing levels they come back into alignment and high single-mode output powers and large modulation bandwidths are observed.
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Highly efficient vertical-cavity surface-emitting lasers optimized for Low-Temperature Operation
IEEE Photonics Technology Letters, 1995Co-Authors: E. Goobar, G. Peters, G. Fish, L.a. ColdrenAbstract:Vertical-cavity surface-emitting lasers designed for Operation in the Temperature range of 77-200 K for cryogenic optical interconnects are reported. Low threshold currents and voltage drops across the mirrors, as well as record high output powers, external efficiencies, and the potential for very high modulation bandwidths are observed.
H. Arai - One of the best experts on this subject based on the ideXlab platform.
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Low Temperature Operation of solid electrolyte oxygen sensors using perovskite type oxide electrodes and cathodic reaction kinetics
Journal of The Electrochemical Society, 1990Co-Authors: T Inoue, K. Eguchi, Noriaki Seki, H. AraiAbstract:The Lowest limit of Operation Temperature for the oxide solid electrolyte oxygen sensors was affected by the electrode materials. The CeO 2 -based sensors with silver and cobalt-based perovskite-type oxide electrodes exhibited theoretical EMF's at Lower Temperatures than those with Pt electrodes. In particular, the sensor with La 0.6 Sr 0.4 Co 0.98 Ni 0.02 O 3 attained theoretical EMF even at 200°C
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Low-Temperature Operation of solid electrolyte oxygen sensors using perovskite-type oxide electrodes and cathodic reaction kinetics
Journal of the Electrochemical Society, 1990Co-Authors: T Inoue, Nobuaki Seki, K. Eguchi, H. AraiAbstract:The Lowest limit of Operation Temperature for the oxide solid electrolyte oxygen sensors was affected by the electrode materials. The \n\nsensors with silver and cobalt‐based perovskite‐type oxide electrodes exhibited theoretical EMF's at Lower Temperatures than those with Pt electrodes. In particular, the sensor with\n\nattained theoretical EMF even at 200°C. The electrode materials operative at Low Temperatures tend to have Low cathodic over‐potential. From the kinetic analysis of the exchange current, the rate‐determining step is expected to be the dissociative adsorption of oxygen molecules at high Temperatures and the charge transfer process at Low Temperatures.
E. Goobar - One of the best experts on this subject based on the ideXlab platform.
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Low-Temperature Operation of vertical cavity surface-emitting lasers
IEEE Photonics Technology Letters, 1995Co-Authors: E. Goobar, C. Mahon, F.h. Peters, M.g. Peters, L.a. ColdrenAbstract:Vertical cavity surface-emitting lasers originally designed for room Temperature Operation are operated at 77 K. At this Temperature, the gain peak and the cavity mode do not overlap. However, due to joule heating, at high biasing levels they come back into alignment and high single-mode output powers and large modulation bandwidths are observed.
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Highly efficient vertical-cavity surface-emitting lasers optimized for Low-Temperature Operation
IEEE Photonics Technology Letters, 1995Co-Authors: E. Goobar, G. Peters, G. Fish, L.a. ColdrenAbstract:Vertical-cavity surface-emitting lasers designed for Operation in the Temperature range of 77-200 K for cryogenic optical interconnects are reported. Low threshold currents and voltage drops across the mirrors, as well as record high output powers, external efficiencies, and the potential for very high modulation bandwidths are observed.
T Inoue - One of the best experts on this subject based on the ideXlab platform.
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Low Temperature Operation of solid electrolyte oxygen sensors using perovskite type oxide electrodes and cathodic reaction kinetics
Journal of The Electrochemical Society, 1990Co-Authors: T Inoue, K. Eguchi, Noriaki Seki, H. AraiAbstract:The Lowest limit of Operation Temperature for the oxide solid electrolyte oxygen sensors was affected by the electrode materials. The CeO 2 -based sensors with silver and cobalt-based perovskite-type oxide electrodes exhibited theoretical EMF's at Lower Temperatures than those with Pt electrodes. In particular, the sensor with La 0.6 Sr 0.4 Co 0.98 Ni 0.02 O 3 attained theoretical EMF even at 200°C
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Low-Temperature Operation of solid electrolyte oxygen sensors using perovskite-type oxide electrodes and cathodic reaction kinetics
Journal of the Electrochemical Society, 1990Co-Authors: T Inoue, Nobuaki Seki, K. Eguchi, H. AraiAbstract:The Lowest limit of Operation Temperature for the oxide solid electrolyte oxygen sensors was affected by the electrode materials. The \n\nsensors with silver and cobalt‐based perovskite‐type oxide electrodes exhibited theoretical EMF's at Lower Temperatures than those with Pt electrodes. In particular, the sensor with\n\nattained theoretical EMF even at 200°C. The electrode materials operative at Low Temperatures tend to have Low cathodic over‐potential. From the kinetic analysis of the exchange current, the rate‐determining step is expected to be the dissociative adsorption of oxygen molecules at high Temperatures and the charge transfer process at Low Temperatures.
Tatsumi Ishihara - One of the best experts on this subject based on the ideXlab platform.
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exsolution of nano metal particle on anode for increased performance at Low Temperature Operation
16th International Symposium on Solid Oxide Fuel Cells SOFC 2019, 2019Co-Authors: Byeong Su Kang, Atsushi Takagaki, Tatsumi IshiharaAbstract:Spinel oxide (CuFe2O4) has been studied as anode for solid oxide fuel cells. Although CuFe2O4 spinel structure was decomposed by reduction atmosphere observed by SEM-EDX, TEM-EDX and XRD, the decomposed CuFe2O4 became metallic phase with the exsolved nano size alloy particles, which were composite of Cu rich Cu-Fe and Fe rich Fe-Cu metal on anode. According to power generation properties, alloy anode formed from CuFe2O4 showed the maximum power density (MPD) of 611 mW/cm2 at 1073 K and 101 mW/cm2 at 873 K. Comparing to Ni-Fe (9:1 wt.%) alloy anode, alloy anode from CuFe2O4 reduction showed significantly decreased anodic polarization resistance, which was measured by impedance spectroscope and so high power density was assigned to nano alloy particles.
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solid oxide fe air rechargeable battery using fe ce mn fe o2 for Low Temperature Operation
Journal of Materials Chemistry, 2016Co-Authors: Atsushi Inoishi, Tatsumi IshiharaAbstract:The effects of Ce0.6Mn0.3Fe0.1O2 (CMF) mixed with Fe for increasing redox properties were investigated in this study, and it was found that the reaction rate constant of Fe oxidation and reduction can be much increased through mixing with CMF. At 673 K, the oxidation rate constant of the Fe powder was higher than that of Fe without added CMF by an order of magnitude and the oxidation degree of the Fe is also increased from 10 to 80% at the initial time. When CMF mixed with Fe was set into the fuel chamber of a solid state Fe–air rechargeable battery, Ni–Fe/La0.9Sr0.1Ga0.8Mg0.2O3/Ba0.6La0.4CoO3, a discharge potential of ca. 1 V and a discharge capacity of 600 mA h gFe−1 was achieved at 673 K which is similar to the operating Temperature of Na–S batteries. A stable discharge capacity was sustained over 20 cycles. In addition, the observed energy density of the present cell, 600 W h kgFe−1, was larger than that of the Na–S battery by 5 times and that of the redox fLow battery by 30 times, and the efficiency of charging and discharging is almost the same. Since the Fe–air rechargeable battery is highly safe and environmentally compatible, it is promising for use as a stationary large capacity rechargeable battery, as an alternative to Na–S or redox fLow batteries.
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development of a Low Temperature Operation solid oxide fuel cell
Journal of The Electrochemical Society, 2001Co-Authors: Jun Akikusa, Kazunori Adachi, Koji Hoshino, Tatsumi Ishihara, Yusaku TakitaAbstract:Lowering Operation Temperature of the solid oxide fuel cell (SOFC) would promote the commercialization of a power-generation module in terms of the manufacturing cost, lifetime, reliability, etc. Mitsubishi Materials Corporation and Oita University have been jointly developing a planar-type SOFC which could operate at a Temperature of about 700°C. As an electrolyte, lanthanum gallate (LaGaO 3 ) with substitution of Sr for the La site and Mg and Co for the Ga site was used at this Temperature. So far we have established a technique for large-seale cell production, and currently we are examining the performance of a commercial-size cell as large as 154 mm in diam. The obtained cell attained an output power of 31 W with an effective electrode area of 177 cm - at 650°C. Furthermore, a stack of two cells has been tested and the use of stainless steel for the separator was found to be possible during the examined time period at this Temperature. The internal CH 4 reforming on the cell has been examined, and the cell output performance using methane [steam/carbon ratio (S/C) = 2] was about 93% of the power density of the cell using hydrogen.
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doped prmno3 perovskite oxide as a new cathode of solid oxide fuel cells for Low Temperature Operation
Journal of The Electrochemical Society, 1995Co-Authors: Tatsumi Ishihara, Takanari Kudo, Hideaki Matsuda, Yusaku TakitaAbstract:Cathodic over potentials of Ln{sub 0.6}Sr{sub 0.4}MnO{sub 3} (Ln = La, Pr, Nd, Sm, Gd, Yb, and Y) were studied for a new cathode of solid oxide fuel cell (SOFC). Cathodic over potentials as well as the electrical conductivity strongly depended on the rare earth cations used for the A sites of perovskite oxide. Strontium doped PrMnO{sub 3} exhibited the highest electrical conductivity among the examined perovskite oxide containing Mn for B sites. Moreover, over potentials of Sr-doped PrMnO{sub 3} cathode maintained Low values in spite of decreasing the operating Temperature. Consequently, almost the same power density of SOFC with La{sub 0.6}Sr{sub 0.4}MnO{sub 3} cathode can be obtained at about 100 K Lower operating Temperature by using Sr-doped PrMnO{sub 3} as the cathode. The over potentials and electrical conductivity decreased and increased with increasing the amount of Sr dopant in PrMnO{sub 3}, respectively, and the Lowest overpotential was attained at x = 0.4 in Pr{sub 1{minus}x}Sr{sub x}MnO{sub 3}. Comparing with La{sub 0.6}Sr{sub 0.4}MnO{sub 3} oxide, the reactivity of Pr{sub 0.6}Sr{sub 0.4}MnO{sub 3} with Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} is much less than that of La{sub 0.06}Sr{sub 0.4}MnO{sub 3} and furthermore, the matching of thermal expansion of Pr{sub 0.6}Sr{sub 0.4}MnO{sub 3}more » with Y{sub 2}O{sub 3}-ZrO{sub 2} was satisfactorily high. Therefore, perovskite oxide of Pr{sub 0.6}Sr{sub 0.4}MnO{sub 3} has a great possibility of the cathode materials for decreasing the operating Temperature of solid oxide fuel cells.« less
