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RISS 인기검색어
- 검색키워드
- 저자 : ( Seenivasan Selvaraj ) (검색결과 5 건)
- 무료
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Selvaraj, Seenivasan,Moon, Hee,Kim, Do-Heyoung Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.429 No.-
<P><B>Abstract</B></P> <P>Photo-electrochemical water splitting with hematite photo-anodes under solar irradiation has attracted considerable attention as regards the production of renewable hydrogen energy. However, many challenges remain unresolved, as the full contribution of the catalytic over-layers has not been fully realized. Herein, we incorporate uniform spinel nickel-ferrite over-layers in hematite photo-anodes to obtain an improved understanding of the associated intrinsic changes. We achieve a 1.5-mA/cm<SUP>2</SUP> photo-current density at 1.23V<SUB>RHE</SUB> (RHE: reversible hydrogen electrode) under one-sun illumination conditions, along with a negative shift of 200mV in the onset potential, for NiFe<SUB>2</SUB>O<SUB>4</SUB>-coated Sn-doped hematite photo-anodes. Fundamental electrochemical analyses clearly show that the shift in the onset potential is predominantly due to the enhanced photo-voltage development inside the hematite, rather than being purely caused by the interfacial kinetics. These insights reveal a new direction for fundamental research on photo-anodes towards fabrication of more efficient photo-anode systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spinel ferrite was evaluated for use as a high-performance photo-anode material. </LI> <LI> A nickel-ferrite over-layer was successfully formed on a 1-D hematite nanorod. </LI> <LI> Improved photo-electrochemical performance was achieved through an increase in the photo-voltage and a decrease in the kinetic over-potential. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Removal of nitrate using amine-grafted and magnetized mesoporous silica material, SBA-15
류성철,( Seenivasan Selvaraj ),심왕근,문희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Mesoporous silica materials such as SBA-15 and MCM-48 have been used in removing nitrates from water bodies. Because of their chemical stability, their adsorption capacities for nitrates are not so high. In most adsorption applications, the important factors are not only their high adsorption capacity but also the reusability of adsorbent materials. Therefore the pristine silica materials are amine-grafted and magnetized to overcome these limitations. In this work, P123, poly(ethylene glycol)- block-poly(propylene glycol)-block-poly(ethylene glycol), was used as a structure directing agent and TEOS, tetraethyl orthosilicate, was used as a silica source for the synthesis of SBA-15. The magnetization of SBA-15 was carried out by introducing 0.5 g of SBA-15 into a solution of 1.34 g Fe(NO3)3ㆍ9H2O and methanol, drying the mixture in an oven at 85°C and then slowly reacting the resultant powder with propionic acid at 105°C. The final product was thermally treated with a rate of 1°C/min to 300°C and then kept it for 5 hr. It was proven that the final silica material is a good recyclable adsorbent for removing and recovering nitrates from water streams.
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Adsorption equilibrium and kinetics of phosphate on modified SBA-15
문희,( Seenivasan Selvaraj ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Modified mesoporous SBA-15 materials were prepared from the pristine SBA-15 synthesized hydrothermally to get effective media for recovering phosphate from water streams. All amine-grafted silica materials were characterized by XRD, BET, and HR-TEM in detail. Adsorption equilibrium isotherms of phosphate on the sample media were obtained from equilibrium experimental data and fitted well with Langmuir, Sips, and Toth isotherm equations. Kinetic experiments were also carried out in a well-stirred batch adsorption system and the film mass transfer and solid phase mass transfer coefficients were estimated based on the linear driving force approximation (LDFA) model. Based on equilibrium and kinetic results, the optimum recipe for amine-grafting was found. Furthermore it was found from cyclic adsorption experiments that the amine-grafted SBA-15 materials maintain the adsorption capacity for phosphate well in spite of repeated use.
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Electrocatalytic performance of NiS thin films for oxygen evolution reaction
문희,유승현,( Seenivasan Selvaraj ) 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The development of low cost, efficient and stable oxygen evolution catalysts is imperative for realization of commercial production of Hydrogen from water. Transition metal sulfides are promising choices for this application due to their exalt activity and stability towards the core half reactions, OER and HER. The synthesized films were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) methods. Fundamental electrochemical analysis reveals the catalytic activity of 10 nm NiS film grown on FTO (Fluorine doped SnO2 coated glass) is 200 mV over potential at 10 mA/cm2 in 1M KOH electrolyte solution. We found that the conversion of nickel sulfide to nickel hydroxide during electro catalysis and the stability improved 24 hours without any significant reduction in current density.
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Iron oxide grown by low-temperature atomic layer deposition
Do-Heyoung Kim,Seenivasan Selvaraj,Hee Moon,Ju-Young Yun 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.12
Atomic layer deposition (ALD) is a promising technology for fabricating conformal thin films of atomlevel thickness with chemical composition control over a variety of structures. This paper demonstrates the ALD of iron oxide thin films using a novel iron precursor, namely, bis[bis(trimethylsilyl)amide]iron [Fe(btmsa)2] and hydrogen peroxide as an oxygen source. The growth characteristics of iron oxide were investigated by varying the deposition temperatures from 100 to 225 oC, such that the ALD growth mode was observed at 150 to 175 oC with an average growth rate of 0.035±0.005 nm/cycle. The films deposited in ALD mode exhibited highly linear film thicknesses with the number of cycles and excellent conformality over high-aspect-ratio trenches. In addition, the deposited films were extremely pure and revealed a hematite phase without any subsequent heat treatment, even if the films were deposited at low temperatures.
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