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제107회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synthesis of Cadmium-Incorporated Iron Oxide Films and Their Photoelectrochemical Performances for Water Oxidation

2011년 2월 24일 16시 57분 01초
Ⅳ-ENVR.P-369 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 <발표Ⅳ>
저자 및
박아영, 박현웅
School of Energy Engineering, Korea
Cd-incorporated nanocrystalline hematite films (Cd-Fe2O3) supported on conducting glass have been prepared via co-electrodeposition of aqueous Fe(III) and Cd(II) with varying Cd:Fe atomic ratios (0 ~ 0.15) and optimized for their photoelectrochemical (PEC) performances under AM 1.5-light. Surface analysis indicates that the Cd co-deposition increases the hematite (α-Fe2O3) particle size from ca. 50 nm to 70 ~ 100 nm due to interparticle agglomeration despite the similar film thickness of ca. 1.7 μm with high porosity whereas it decreases the overall UV-Vis absorbance of hematite with increasing Cd atomic content. X-ray photoelectron spectroscopic study suggests that Cd incorporation shifts the binding energy of oxygen atoms to lower energy direction whereas it did not affect the binding energy of Fe 3d, implying that Cd exists mainly as CdO and/or Cd(OH)2 on the hematite surface. When Cd of 5 ~ 8 atomic % was co-electrodeposited, the photocurrent of hematite film was significantly enhanced by a factor of ca. four at E = 1.23 VRHE under AM 1.5-light and such enhancement was maintained even under the irradiation condition of λ ~ 665 nm. Electrochemical impedance spectroscopic analysis further revealed that the flat band potential of hematite was shifted by ca. – 30 mV to negative potential direction and the charge transfer resistance (Rct) was significantly reduced by Cd incorporation. On the basis of through surface and photoelectrochemical study, electrodeposited Cd was speculated to be mostly present on the hematite surface as forms CdO and Cd(OH)2, which play multiple roles in generating the Cd-induced effects. Detailed surface analyses, optimization for preparation condition of hematite films, and discussion for PEC behaviors were described