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RISS 인기검색어
- 검색키워드
- 저자 : Shanmugam Vignesh (검색결과 4 건)
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Shanmugam Vignesh,Sanjeevamuthu Suganthi,Jeyaperumal Kalyana Sundar,Vairamuthu Raj 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
Improving visible-light active photocatalytic performance of the heterostructured g-C3N4-V-TiO2 (g-C3N4-Vanadium-TiO2) hybrid catalyst has been synthesized via facile calcination and ultrasonicdispersion facilitated hydrothermal techniques were considered. The phase composition, morphology,surface area, chemical structure as well as optical properties were systematically characterized. HR-TEMimages were exposed good crystallinity of g-C3N4-10% V-TiO2 nanocomposite (size~35–40 nm) with VTiO2porous discrete on g-C3N4 nanosheets. Too occurred in high pore volume and large surface area(91.5 m2 g 1) of g-C3N4-10% V-TiO2 hybrid catalyst compared than pristine g-C3N4. The 10% g-C3N4-V-TiO2photocatalyst shows substantial photocatalytic activity, 5.7 and 4.8 times higher that pristine g-C3N4nanosheets and TiO2 under visible light with the degradation efficiency over 99.5% for 60 min. Besides,the recycling test specified that the g-C3N4-10% V-TiO2 photocatalyst had admirable stability up to 5sequential cycles. The trapping assessments which authorize that OH radicals and h+ plays an activerole in the degradation process and the separation of photoinduced charges transversely theheterostructure boundary reserved electron-hole recombination they were good agree with PL studies. Moreover, g-C3N4-10% V-TiO2 composite catalyst show high catalytic antibacterial activity againstEscherichia coli (G ) and the Staphylococcus aureus (G+) bacteria.
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Vignesh, Ahilan,Prabu, Moni,Shanmugam, Sangaraju American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.9
<P>Perovskites have emerged as promising earth-abundant alternatives to precious metals for catalyzing the oxygen evolution reaction (OER). Herein, we report the synthesis of a series of porous perovskite nanostructures, LaCo0.97O3-delta, with systematic Ni substitution in Co octahedral sites. Their electrocatalytic activity during the water oxidation reaction was studied in alkaline electrolytes. The electrocatalytic OER activity and stability of the perovskite nanostructure was evaluated using the rotating disk electrode technique. We show that the progressive replacement of Co by Ni in the LaCo0.97O3-delta perovskite structure greatly altered the electrocatalytic activity and that the La(Co0.71Ni0.25)(0.96)O3-delta composition exhibited the lowest OER overpotential of 324 and 265 mV at 10 mA cm(-2) in 0.1 M KOH and 1 M KOH, respectively. This value was much lower than that of the noble metal catalysts, IrO2, Ru/C, and Pt/C. Furthermore, the La(Co0.71Ni0.25)(0.96)O3-delta nanostructure showed outstanding electrode stability, with no observable decrease in performance up to 114th cycle in the auxiliary linear sweep voltammetry that lasted for 10 h in chronoamperometry studies. The excellent oxygen evolution activity of the La(Co0.71Ni0.25)(0.96)O3-delta perovskite nanostructure can be attributed to its intrinsic structure, interconnected particle arrangement, and unique redox characteristics. The enhanced intrinsic electrocatalytic activity of the La(Co0.71Ni0.25)(0.96)O3-delta catalyst was correlated with several parameters, such as the electrochemical surface area, the roughness factor, and the turnover frequency, with respect to variation in the transition metals of the perovskite structure. Subsequently, La(Co0.71Ni0.25)(0.96)O3-delta was utilized as the air cathode in a zincair battery application.</P>
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Yuvaraj, S.,Vignesh, A.,Shanmugam, S.,Kalai Selvan, R. Elsevier 2016 International journal of hydrogen energy Vol.41 No.34
<P><B>Abstract</B></P> <P>Nitrogen-doped Multi-walled Carbon Nanotubes (N-doped MWCNT)/MnCo<SUB>2</SUB>O<SUB>4</SUB> hybrid is synthesized by a facile hydrothermal method. The X-ray diffraction studies revealed the single phase formation of cubic spinel structured MnCo<SUB>2</SUB>O<SUB>4</SUB> and their composites. The presence of D and G band of MWCNT is identified through Raman spectral analysis. The elemental oxidation state and nitrogen content is obtained using X-ray photoelectron spectroscopy, which elucidates that Co and Mn exists in multivalence state and the nitrogen functional groups are in pyrolytic and pyridinic-type. FE-SEM shows the microsphere formation of MnCo<SUB>2</SUB>O<SUB>4</SUB> and size exhibits in the range of 6–9 μm. The N-doped MWCNT/MnCo<SUB>2</SUB>O<SUB>4</SUB> hybrid catalyst exhibits an improved oxygen reduction electrocatalytic activity in an aqueous alkaline medium when compared with pristine MnCo<SUB>2</SUB>O<SUB>4</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> N-doped MWCNT composite with MnCo<SUB>2</SUB>O<SUB>4</SUB> was prepared by single step hydrothermal method. </LI> <LI> The half-wave potentials of MWCNT-MnCo<SUB>2</SUB>O<SUB>4</SUB> is 30 mV higher than MWCNT and 150 mV higher than MnCo<SUB>2</SUB>O<SUB>4</SUB> catalyst. </LI> <LI> MWCNT-MnCo<SUB>2</SUB>O<SUB>4</SUB> hybrid exhibits an improved ORR activity in an aqueous alkaline medium compared to pristine samples. </LI> </UL> </P>
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