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Shahid Ali,Manzar Sohail,Riaz Ahmed,Safyan Akram Khan,Muhammad Shahid Ansari 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Co@Pt (Co-core, Pt-shell) 4–10 nm sized particles supported on functionalized multi-walled carbonnanotubes (MWCNTs) have been synthesized and tested as efficient catalyst in direct methanol fuel cells(DMFCs). Catalytic activity and durability of all the catalysts for methanol oxidation (MO) have beenstudied in basic medium (0.5 M KOH) using cyclic voltammetry (CV). Chronoamperometry studiesrevealed that Co@Pt/MWCNTs has significantly high efficiency and stability than both Pt/MWCNTs andCo@Pt/MWCNTs catalysts. Mass activity exhibited by Co@Pt/MWCNTs for MO is 1.61 and 3.36 timeshigher than those of Pt–Co/MWCNTs and Pt/MWCNTs, respectively.
Enhanced Magnetic Moment of Epitaxial Υ´-Fe<sub>4</sub>N Films at Low Temperature
Shahid Atiq,Murtaza Saleem,Shahid M. Ramay,Saadat A. Siddiqi,M. Sabieh Anwar,신성철 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
Ferromagnetic iron nitride has fascinated the researchers owing to its amazing magnetic properties for spintronic applications. We have prepared single phase epitaxial thin films of Υ´-Fe<sub>4</sub>N on single crystal MgO(100) substrates using dc magnetron sputtering. X-ray diffraction revealed that substrate temperature and annealing time were most important parameters for single phase epitaxial growth of the films. Atomic force microscopy and scanning electron microscopy were utilized to investigate the surface morphology of the films. Angle dependent magnetic anisotropy was observed in epitaxial thin films of Υ´-Fe<sub>4</sub>N. A superconducting interference device was utilized to explore the magnetic and electrical behavior of Υ´-Fe<sub>4</sub>N films at low temperatures.
Adsorption Behavior of Pb(II) Onto Potassium Polytitanate Nanofibres
Shahid, Mohammad,Tijing, Leonard D.,El Saliby, Ibrahim,McDonagh, Andrew,Kim, Jong-Beom,Kim, Jong-Ho,Shon, Ho Kyong American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.2
<P>Potassium polytitanate nanofibres prepared by a hydrothermal method were investigated for their possible application in removing toxic metals from aqueous solution. Particular attention was paid to employing the titanate as a novel effective adsorbent for the removal of Pb(II). Batch adsorption experiments demonstrated that the adsorption was influenced by various conditions such as solution pH, adsorbent dosage and initial Pb(II) concentration. The results showed that the adsorption rate was faster in the first 5 min and equilibrium was achieved after 180 min. The maximum amount of adsorption was detected at pH 5. Potassium titanate showed much higher adsorption capacity compared to P25. The kinetic studies indicated that the adsorption of Pb(II) onto titanate best fit the pseudo-second-order kinetic model. FTIR spectra revealed that the hydroxyl groups in titanate were responsible for Pb(II) adsorption. The principal mechanism of the adsorption of Pb(II) in the present study is attributed to both ion exchange and oxygen bonding. The adsorption desorption results demonstrated that the titanate could be readily regenerated after adsorption. Therefore, the present titanate exhibits great potential for the removal of Pb(II) from wastewater.</P>
Reduced Titania Films with Ordered Nanopores and Their Application to Visible Light Water Splitting
Shahid, Muhammad,Choi, Seo-Yeong,Liu, Jingling,Kwon, Young-Uk Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.8
We report on the photoelectrochemical properties of partially reduced mesoporous titania thin films. The fabrication is achieved by synthesizing mesoporous titania thin films through the self-assembly of a titania precursor and a block copolymer, followed by aging and calcination, and heat-treatment under a $H_2$ (1 torr) environment. Depending on the temperature used for the reaction with $H_2$, the degree of the reduction (generation of oxygen vacancies) of the titania is controlled. The oxygen vacancies induce visible light absorption, and decrease of resistance while the mesoporosity is practically unaltered. The photoelectrochemical activity data on these films, by measuring their photocurrent-potential behavior in 1 M NaOH electrolyte under AM 1.5G 100 mW $cm^{-2}$ illumination, show that the three effects of the oxygen vacancies contribute to the enhancement of the photoelectrochemical properties of the mesoporous titania thin films. The results show that these oxygen deficient $TiO_2$ mesoporous thin films hold great promise for a solar hydrogen generation. Suggestions for the materials design for improved photoelectrochemical properties are made.