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Very small temperature-dependent band-gap energy in TlInGaAs/InP double heterostructures grown by gas-source molecular-beam epitaxy (2000)

Ayabe, A. ; Asahi, H. ; Lee, H. J. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 77 (2000), S. 2148-2150

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: TlInGaAs/InP double heterostructures (DHs) were grown on (100) InP substrates by gas-source molecular-beam epitaxy. Almost no occurrence of Tl interdiffusion at the InP/TlInGaAs heterointerface was confirmed. The photoluminescence (PL) intensity for the DH was approximately ten times stronger than that of the single heterostructure. The PL peak energy and its variation with temperature for the TlInGaAs/InP DH decreased with increasing Tl composition. For the DH with a Tl composition of 13%, the PL peak energy varied only slightly with temperature (0.03 meV/K). This value corresponds to a wavelength variation of 0.04 nm/K and is much smaller than that of the lasing wavelength of InGaAsP/InP distributed feedback laser diodes (0.1 nm/K). © 2000 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1314881

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Surface activation of manganese oxide electrode for oxygen evolution from seawater (1997)

IZUMIYA, K. ; AKIYAMA, E. ; HABAZAKI, H. ; [et al.]

Springer

Journal of applied electrochemistry 27 (1997), S. 1362-1368

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ISSN: 1572-8838

Keywords: manganese oxide electrode ; oxygen evolution ; seawater electrolysis ; surface activation

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology

Notes: Abstract Utilizing the fact that the equilibrium potential of oxygen evolution is lower than that of chlorine evolution, oxygen evolution in seawater electrolysis was enhanced by decreasing the polarization potential under galvanostatic conditions through increasing the effective surface area of manganese oxide electrodes. Electrodes were prepared by a thermal decomposition method. IrO2-coated titanium (IrO2/Ti electrode) was used as the substrate on which manganese oxide was coated (MnOX/IrO2/Ti electrode). Subsequently, oxide mixtures of manganese and zinc were coated (MnOX–ZnO/MnOX/IrO2/Ti electrode). The effective surface area of the MnOX–ZnO/MnOX/IrO2/Ti electrodes was increased by selective dissolution of zinc (leaching) into hot 6M KOH. The oxygen evolution efficiency of the MnOX/IrO2/Ti electrode was 68–70%. Leaching of zinc from the MnOX–ZnO/MnOX/IrO2/Ti electrodes with 25mol% or less zinc led to a significant increase in the oxygen evolution efficiency. The maximum efficiency attained was 86% after leaching of zinc from the MnOX–25mol%ZnO/MnOX/IrO2/Ti electrode. However, large amounts of zinc addition, such as 40mol% or more are detrimental because of a decrease in the oxygen evolution efficiency. This is due to the formation of a double oxide, ZnMnO3, which is hardly dissolved in hot 6M KOH.