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Supercapacitors based on ternary nanocomposite of TiO2&Pt@graphenes
Ghouri, Z. K.,Barakat, N. A.,Saud, P. S.,Park, M.,Kim, B. S.,Kim, H. Y. Springer Science + Business Media 2016 Journal of materials science Materials in electron Vol.27 No.4
<P>The electrochemical properties of graphene can be significantly enhanced due to the incorporating of hetero-atoms into the graphene. In this article Crumpled-like TiO2-Pt/graphene nanocomposite from graphene oxide (GO), titanium (III) chloride (TiCl3) and Hydrogen hexa chloro palatinate (H2PtCl6) was synthesized via a simple reflux strategy and employed as a simple capacitor electrode material. The nanocomposite was characterized by XRD, XPS, FESEM, HRTEM and the electrochemical properties were investigated by cyclic voltammetry (CV). Electrochemical characterization for introduced nanocomposite indicated that the corresponding specific capacitance is 160 F/g (at 5 mV/s) with good stability. The high electrochemical performance is recognized to the presence of Pt nanoparticles on the nanocomposite and graphene distinct characteristics. To the best of our knowledge this is the first report on TiO2-Pt/graphene nanocomposite as an electrical double layer capacitor material.</P>
The (2 x 2) tunnels structured manganese dioxide nanorods with α phase for lithium air batteries
Ghouri, Z.K.,Zahoor, A.,Barakat, N.A.M.,Alsoufi, M.S.,Bawazeer, T.M.,Mohamed, A.F.,Kim, H.Y. Academic Press 2016 Superlattices and microstructures Vol.90 No.-
The (2 x 2) tunnels structured manganese dioxide nanorods with α phase (α-MnO<SUB>2</SUB>) are synthesized via simplistic hydrothermal method at low temperature. The obtained tunnels structured α-MnO<SUB>2</SUB> nanorods are characterized by, Transmission electron microscopy, Scanning electron microscopy, and X-ray diffraction techniques. The oxygen reduction reaction (ORR) activity was studied by cyclic voltammetry and rotating ring-disc electrode voltammetry techniques in alkaline media. Moreover; the highly electrocatalytic tunnels structured α-MnO<SUB>2</SUB> nanorods were then also applied as cathode in rechargeable Li-O<SUB>2</SUB> cells. The Li-O<SUB>2</SUB> cells exhibited initial discharge capacity as high as ~4000 mAh/g with the tunnels structured α-MnO<SUB>2</SUB> nanorods which was double the original capacity of the cells without any catalyst. Also we obtained 100% round trip efficiency upon cycling with limited capacity for more than 50 cycles.
Nano-engineered ZnO/CeO<sub>2</sub> dotsΓNFs for fuel cell application
Ghouri, Z.K.,Barakat, N.A.M.,Kim, H.Y.,Park, M.,Khalil, K.A.,El-Newehy, M.H.,Al-Deyab, S.S. Elsevier 2016 Arabian journal of chemistry Vol.9 No.2
<P>Well-dispersed ZnO(x)CeO2(1-x) nanodots@carbon nanofibers as anode catalysts for the electrooxidation of methanol were synthesized by an easy-controlled template-free method. Their structure and morphology were characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), field-emission scanning electron microscopy (FESEM) equipped with rapid EDX (energy dispersive analysis of X-ray). The appealed characterization techniques specified that the obtained material is carbon nanofibers decorated by ZnO and CeO2 nanodots. The electrochemical oxidation of methanol on ZnO(x)CeO2(1-x) nanodots@CNFs modified glassy carbon electrode in alkaline solutions was systematically evaluated by cyclic voltammetry (CV) method. A detailed investigation is made for the electrocatalytic oxidation of methanol by varying methanol concentration. The corresponding current densities of ZnO(60%)CeO2(40%) nanodots@CNFs and ZnO(40%)CeO2(60%) nanodots@CNFs were 5.3 and 16.3 mA/cm(2), respectively. Moreover, negative onset potential (-50 mV vs. Ag/AgCl) was observed when ZnO(40%)CeO2(60%) nanodots@CNFs were utilized, which is a superior value among the reported non-precious electrocatalysts. These results suggested cheap and effective nanomaterials as non-precious catalyst for DMFCs application and pave the way to further improve the performance in energy and environmental applications. (C) 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University.</P>
Obaid, M.,Ghouri, Zafar Khan,Fadali, Olfat A.,Khalil, Khalil Abdelrazek,Almajid, Abdulhakim A.,Barakat, Nasser A. M. American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.7
<P>Novel amorphous silica nanoparticle-incorporated poly(vinylidine fluoride) electrospun nanofiber mats are introduced as effective membranes for forward osmosis desalination technology. The influence of the inorganic nanoparticle content on water flux and salt rejection was investigated by preparing electrospun membranes with 0, 0.5, 1, 2, and 5 wt % SiO2 nanoparticles. A laboratory-scale forward osmosis cell was utilized to validate the performance of the introduced membranes using fresh water as a feed and different brines as draw solution (0.5, 1, 1.5, and 2 M NaCl). The results indicated that the membrane embedding 0.5 wt % displays constant salt rejection of 99.7% and water flux of 83 L m(-2) h(-1) with 2 M NaCl draw solution. Moreover, this formulation displayed the lowest structural parameter (S = 29.7 mu m), which represents approximately 69% reduction compared to the pristine membrane. Moreover, this study emphasizes the capability of the electrospinning process in synthesizing effective membranes as the observed water flux and average salt rejection of the pristine poly(vinylidine fluoride) membrane was 32 L m(-2) h(-1) (at 2 M NaCl draw solution) and 99%, respectively. On the other hand, increasing the inorganic nanoparticles to 5 wt % showed negative influence on the salt rejection as the observed salt flux was 1651 mol m(-2) h(-1) Besides the aforementioned distinct performance, studies of the mechanical properties, porosity, and wettability concluded that the introduced membranes are effective for forward osmosis desalination technology.</P>
D. Turki,Zafar Khan Ghouri,Saeed Al-Meer,Khaled Elsaid,M. I. Ahmad,Ahmed Easa,M. Ellouze,E. K. Hlil 한국자기학회 2017 Journal of Magnetics Vol.22 No.3
The physicochemical properties of La0.8Ca0.2Mn1−xCoxO₃ nanopowders as a function of Co content (x) have been investigated. La0.8Ca0.2Mn1−xCoxO₃ nanopowders were synthesized by sol-gel method and morphologically and structurally well characterized by Scanning electron microscopic (SEM), Infrared spectroscopic (IR) and Raman spectroscopic techniques. IR spectra shows peak at around 600 cm<SUP>−1</SUP> attributed to the stretching mode of MnO6 octahedral and peak at 700 cm<SUP>−1</SUP> assigned to La-Ca-O-Mn bending vibrations. Raman spectra indicate peaks at around 512 and 652 cm<SUP>−1</SUP> related to the Jahn-Teller octahedral distortions. The intensity of these peaks increases with increasing Co doping. The UV-visible spectra were measured in the frequency range of 200-800 nm and two energy gaps were found at 1.63 eV and 3.294 eV for x = 0, 0.1 and 0.3.
Alam, A.M.,Ghouri, Z.K.,Barakat, N.A.M.,Saud, P.S.,Park, M.,Kim, H.Y. IPC Science and Technology Press 2016 Polymer Vol.85 No.-
In this work, a photoluminescent (PL) and transparent nanocomposite mat was demonstrated based on Nylon-6 (PA-6) nanofibers (NFs) mat, core-shell CdSe@ZnS quantum dots (QD) and Polymethyl methacrylate (PMMA) polymeric solution. Green and red emissive CdSe@ZnS QD was synthesized by one step approach, involving chemical composition gradient technique using standard schlenk line. Dip coating method was adopted to decorate PA-6 NFs mat with CdSe@ZnS QD and PMMA thin layer in sequence to introduce PL properties and optical transparency, respectively in the nanocomposite mat. The morphology of NFs, existence of QD in the nanocomposite, and optical characteristics such as PL and visible light transmittance of the nanocomposite were examined by various physio-chemical techniques. The dried PA-6/CdSe@ZnS/PMMA nanocomposite mats exhibited light transparency in daylight condition as well as emission of green and red color similar to the individual PL of green and red emitting CdSe@ZnS QD when they were excited under UV light or in a spectrofluorimeter. The results indicated the well preserved quantum confinement properties of the prepared QD in the mat. The fabricated mat found to be demonstrated transparency over 50% in the visible wavelength range of 400-800 nm.
Alam, Al-Mahmnur,Park, Byung-Yong,Ghouri, Zafar Khan,Park, Mira,Kim, Hak-Yong The Royal Society of Chemistry 2015 GREEN CHEMISTRY Vol.17 No.7
<P>Carbon quantum dots (CQD) with down and up-conversion photoluminescence (PL) properties have been synthesized through low-temperature carbonization in a facile one step green method from cabbage as the natural source of carbon. The physiochemical and optical properties of the resultant CQD were performed using transmission electron microscopy, confocal laser scanning microscopy and various spectroscopic methods. The CQD with a quantum yield of 16.5% demonstrated excellent solubility and stability in aqueous media, superior resistance to photo bleaching, consistent PL within a biological pH range, excitation-dependent down conversion and excitation-independent up-conversion PL along with large stock shift behaviour. The purified CQD exhibited low cytotoxicity at higher concentration (500 μg ml<SUP>−1</SUP>) during the cell viability experiment against HaCaT cell, an immortalized non-tumerogenic human keratinocyte cell. Subsequently, CQD treated cells displayed three distinguished blue, green and red colours under a confocal microscope during <I>in vitro</I> imaging. Due to the advantages of green synthesis, high biocompatibility, excellent optical properties, low cytotoxicity and good cellular imaging outcome, the cabbage derived CQD showed considerable promise in biomedical applications.</P> <P>Graphic Abstract</P><P>The synthesis of luminescent and biocompatible carbon quantum dots is demonstrated from cabbage, a new carbonaceous biomaterial, for bio-imaging. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5gc00686d'> </P>