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고온 태양열 2단계 열화학 반응기 형상에 따른 수소 생산량의 변화 연구(Ⅰ)
신예원(Shin Ye-won),오상준(Oh Sang-June),N. Gokon,T. Kodama,서태범(Seo Tae-beom) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
A two step thermochemical cycle includes a T-R(Thermal Reduction)step and W-D(Water Decomposition)step and the mechanism is oxidation/reduction reaction. The react temperature for T-R step is about 2200℃ and for W-D step is about 1000℃. In this study, NiFe₂O₄ and Fe₃O₄ supported on monoclinic ZrO₂ is used to device and Ni powder is help to reduce the T-R step reaction temperature. The experiment performed a field scale with dish type solar heat concentrated system(Inha dish-1, Songdo, Incheon). In this study, hydrogen production is analyzed varying the number of cycles and a sharply fluctuated environment with 2nd reactor. The cycle repeated 5 times, ferrite conversion rate are 4.49~29.97% and hydrogen production rate is 0.19~1.54mmol/g-ferrite. And it perform a basic research for improving a reactor design to increase a hydrogen production and stabilize. For this subject, results of 2nd and 3rd reactor is compared when the cycle is finished.
X-ray Photoelectron and UV Photoyield Spectroscopic on Sr$_x$Bi$_y$Ta$_2$O$_9$ Films
M. Takahashi,H. Funakubo,K. Kodama,M. Noda,M. Okuyama,T. Watanabe 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Photoemissions from ferroelectric SrxBiyTa2O9 (SBT) thin lms deposited by metalorganic chemical vapor deposition (MOCVD), pulsed lased deposition (PLD) and metalorganic decomposition (MOD) have been analyzed by X-ray photoelectron spectroscopy (XPS) and UV-photoyield spectroscopy (UV-PYS) in order to study their valence bands, Bi 4f core levels and Fermi levels. The XPS has shown band tails above the valence bands in all of the SBT lms, which are considered to induce UV-PYS signal from the Fermi levels. The XPS have also indicated that there exist less stable (Bi2O2)2+ layers in the inside of the PLD-SBT than in the MOCVD- and the MOD-SBT lms. P-E hystereses have been measured at various voltage sweeping rates, and have suggested that leakage currents through the capacitors are increased as the band tails in the valence bands are enlarged.