Publications
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Journal articles
Wu, H., Wexler, D., Wang, G. & liu, H.2012, 'Co-core-Pt-shell nanoparticles as cathode catalyst for PEM fuel cells', Journal of Solid State Electrochemistry, vol. 16, no. 3, pp. 1105-1110.
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Nanoscale Co-core-Pt-shell particles were successfully synthesized based on a successive reduction strategy. The as-prepared core-shell nanoparticles were characterized by X-ray diffraction, energy-dispersive X-ray spectroscopy, transmission electron microscope, and electrochemical methods. It was found that the catalytic reactivity of Co-core-Pt-shell/C catalysts toward oxygen reduction was enhanced. It is believed that the prepared Co-core-Pt-shell/C nanoparticles could be promising for cathode catalysis in proton exchange membrane fuel cells with much reduced Pt content, but significantly increased catalytic activity.
Li, K., Wang, B., Su, D., Park, J., Ahn, H., Wang, G.2012, 'Enhance electrochemical performance of lithium sulfur battery through a solution-based processing technique', Journal of Power Sources, vol. 202, pp. 389-393.
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Sulfur/carbon nanocomposites have been successfully prepared by a solution-based processing technique using dimethyl sulfoxide as the solvent. The as-prepared nanocomposites were characterized by X-ray diffraction and field emission scanning electron microscopy. The electrochemical performance of sulfur/carbon nanocomposites were tested by cyclic voltammetry and galvanostatic charge/discharge cycling. When applied as the cathode material in lithium sulfur batteries, the as-prepared sulfur/carbon nanocomposites exhibited a high reversible capacity of 1220 mAh/g in the first cycle and maintained a satisfactory cyclability. This drastic improvement of specific capacity and cycling performance could be attributed to the reduced particle size of sulfur and the homogeneous distribution of sulfur nanoparticles on a carbon matrix, resulting from this novel solution-based processing technique.
Ma, R., Shimmon, R.G., McDonagh, A.M., Maynard, P.J., Lennard, C.J., Roux, C.P.2012, 'Fingermark detection on non-porous and semi-porous surfaces using YVO4:Er,Yb luminescent upconverting particles', Forensic Science International, vol. 217, no. 1-3, pp. e23-e26.
Sun, B., Wang, B., Su, D., Xiao, L., Ahn, H., Wang, G.2012, 'Graphene nanosheets as cathode catalysts for lithium-air batteries with an enhanced electrochemical performance', Carbon, vol. 50, no. 2, pp. 727-733.
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Graphene nanosheets have been investigated as cathode catalysts for lithium-air batteries with alkyl carbonate electrolyte. Field emission scanning electron microscopy, transmission electron microscope and Raman spectroscopy have confirmed the high quality of the as-prepared graphene nanosheets and the surface analysis has identified the mesoporous characteristic of graphene nanosheets. The electrochemical properties of graphene nanosheets as cathode catalysts in lithium-air batteries were evaluated by a galvanostatic charge/discharge testing. The reaction products on the graphene nanosheets cathode were analyzed by X-ray diffraction and Fourier transform infrared spectroscopy. The graphene nanosheet electrodes exhibited a much better cycling stability and lower overpotential than that of the Vulcan XC-72 carbon. This work demonstrated that graphene nanosheets could be an efficient catalyst for lithium-air batteries.
Liu, H., Du, X., Xing, X., Wang, G. & Qiao, S.z.2012, 'Highly ordered mesoporous Cr2O3 materials with enhanced performance for gas sensors and lithium ion batteries', Chemical Communications, vol. 48, no. 6, pp. 865-867.
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Abstract: Highly ordered mesoporous Cr2O3 materials with high specific surface area and narrow pore size distribution were successfully prepared by a vacuum assisted impregnation method. Both 2-dimensional hexagonal and 3-dimensional cubic Cr2O3 mesoporous replicas from SBA-15 and KIT-6 templates exhibit enhanced performance for gas sensors and lithium ion batteries, compared to the bulk Cr2O3 counterpart.
Wang, Y., Su, D., Ung, A., Ahn, J., Wang, G.2012, 'Hollow CoFe(2)O(4) nanospheres as a high capacity anode material for lithium ion batteries', Nanotechnology, vol. 23, no. 5, p. 055402.
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Abstract: Hollow structured CoFe(2)O(4) nanospheres were synthesized by a hydrothermal method. The uniform hollow nanosphere architecture of the as-prepared CoFe(2)O(4) has been confirmed by field emission scanning electron microscopy and transmission electron microscopy analysis, which give an outer diameter of 200-300 nm and a wall thickness of about 100 nm. CoFe(2)O(4) nanospheres exhibited a high reversible capacity of 1266 mA h g(-1) with an excellent capacity retention of 93.6% over 50 cycles and an improved rate capability. CoFe(2)O(4) could be a promising high capacity anode material for lithium ion batteries.
Kim, I., Nam, T., Kim, K., Ahn, J., Park, D., Ahn, C., Chun, B.S., Wang, G. & Ahn, H.2012, 'LiNi0.4Co0.3Mn0.3O2 thin film electrode by aerosol deposition', Nanoscale Research Letters, vol. 7, no. 1, p. 64.
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LiNi0.4Co0.3Mn0.3O2 thin film electrodes are fabricated from LiNi0.4Co0.3Mn0.3O2 raw powder at room temperature without pretreatments using aerosol deposition that is much faster and easier than conventional methods such as vaporization, pulsed laser deposition, and sputtering. The LiNi0.4Co0.3Mn0.3O2 thin film is composed of fine grains maintaining the crystal structure of the LiNi0.4Co0.3Mn0.3O2 raw powder. In the cyclic voltammogram, the LiNi0.4Co0.3Mn0.3O2 thin film electrode shows a 3.9-V anodic peak and a 3.6-V cathodic peak. The initial discharge capacity is 44.6 I?Ah/cm2, and reversible behavior is observed in charge-discharge profiles. Based on the results, the aerosol deposition method is believed to be a potential candidate for the fabrication of thin film electrodes.
Su, D., Josip, H., Paul, M., Ahn, H., Ranjbartoreh, A., Wang, G.2012, 'Polyhedral magnetite nanocrystals with multiple facets: Facile synthesis, structural modelling, magnetic properties and application for high capacity lithium storage', Chemistry: A European Journal, vol. 18, no. 2, pp. 488-497.
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Abstract: Polyhedral magnetite nanocrystals with multiple facets were synthesised by a low temperature hydrothermal method. Atomistic simulation and calculations on surface attachment energy successfully predicted the polyhedral structure of magnetite nanocrystals with multiple facets. X-ray diffraction, field emission scanning electron microscopy, and high resolution transmission microscopy confirmed the crystal structure of magnetite, which is consistent with the theoretical modelling. The magnetic property measurements show the superspin glass state of the polyhedral nanocrystals, which could originate from the nanometer size of individual single crystals. When applied as an anode material in lithium ion cells, magnetite nanocrystals demonstrated an outstanding electrochemical performance with a high lithium storage capacity, a satisfactory cyclability, and an excellent high rate capacity.
Morelato, M., Beavis, A.D., Ogle, A., Doble, P.A., Kirkbride, K.P., Roux, C.P.2012, 'Screening of gunshot residues using desorption electrospray ionisation-mass spectrometry (DESI-MS)', Forensic Science International, vol. 217, no. 1-3, pp. 101-106.
Notter, S.J., Stuart, B.H.2012, 'The effect of body coverings on the formation of adipocere in an aqueous environment', Journal of Forensic Sciences, vol. 57, pp. 120-125.
