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이대한,김필수,최민수,백창현,김철훈,강상욱,손호진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A series of heteroleptic Ir(III) complexes functionalized with the two phosphonic acid (-PO<sub>3</sub>H<sub>2</sub>) groups (<sup>dfppy</sup>IrP, <sup>ppy</sup>IrP, <sup>btp</sup>IrP, and <sup>piq</sup>IrP) are prepared and anchored onto Re(I) catalyst (ReP)-loaded TiO<sub>2</sub> particles (TiO<sub>2</sub>/ReP) to build up a new IrP-sensitized TiO<sub>2</sub> photocatalyst system (IrP/TiO<sub>2</sub>/ReP). The photosensitizing behavior of the IrP series was examined in IrP/TiO<sub>2</sub>/ReP platform for photocatalytic CO<sub>2</sub>-to-CO conversion. The four IrP-based ternary hybrids showed increased conversion activity and durability than the corresponding homogeneous (IrP + ReP) and heterogeneous (IrP + TiO<sub>2</sub>/ReP) mixed systems. Among the four IrP/TiO<sub>2</sub>/ReP photocatalysts, the low energy light (> 500 nm)-active <sup>piq</sup>IrP immobilized ternary system (<sup>piq</sup>IrP/TiO<sub>2</sub>/ReP) exhibited the most durable conversion activity, giving a turnover number of ≥730 for 170 h.
이대한,최성한,최민수,나수원,김철훈,강상욱,손호진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Red light-sensitized squaraine (SQ) dyes were developed and incorporated into dye-sensitized catalyst (DSC) with the formula of SQ/TiO<sub>2</sub>/Cat, and their efficacies were evaluated in terms of performance on either water or carbon dioxide reduction. Pt nanoparticles or fac-[Re(4,4′-bis-(diethoxyphosphorylmethyl)-2,2′-bipyridine)(CO)<sub>3</sub>Cl] were used as each catalytic center within the DSC frame of SQ/TiO<sub>2</sub>/Pt (Type I) or SQ/TiO<sub>2</sub>/Re(I) (Type II). In order to convey the potential utility of SQ in low energy sensitization, the following catalytic reductions were carried out under selective lower energy irradiation (> 500 nm). Type I and II showed different catalytic performances, primarily due to the choice of solvent for each catalytic condition: hydrogenation was carried out in H<sub>2</sub>O, but CO<sub>2</sub> reduction in DMF, and SQ was more stable in aqueous acid condition for hydrogen generation than CO<sub>2</sub> reduction in DMF.
Effect of stabilizer MgO on the properties of Na<sup>+</sup>-beta-aluminas
이대한,김진식,임성기 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Na<sup>+</sup>-beta-alumina is well known as an efficient sodium ionic conductor that can be used as the solid electrolyte of Na-based batteries. In this study, Na<sup>+</sup>-beta-aluminas were synthesized by solid state reaction according to MgO contents as stabilizer. Na<sup>+</sup>-beta-alumina specimens were synthesized by sodium concentration which molar ratio was [Na<sub>2</sub>O] : [Al<sub>2</sub>O<sub>3</sub>] = 1 : 5 and MgO contents were changed at 1.1 to 3.6wt.%. Each fabricated specimen was analyzed by X-ray diffraction (XRD), scanning electron microscopy(SEM) and ionic conductivity using impedance measurement.
Effect of stabilizer Li2O on the properties of Na+-beta-aluminas
이대한,김진식,윤명상,임성기 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Na+-beta-aluminas were synthesized by solid state reaction according to Li2O contents as stanilizer. Na+-beta-alumina specimens were synthesized by sodium concentration which molar ratio was [Na2O] : [Al2O3] = 1 : 4.5 and Li2O contents were changed at 0.3 to 0.55 wt.%. Each fabricated specimen was analyzed by X-ray diffraction, scanning electron microscopy and ionic conductivity using impedance measurement.