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Papers by bing guo

Journal of Power Sources, 2006

Composite polymer electrolyte membranes with nano-TiO 2 films are fabricated by deposition of tit... more Composite polymer electrolyte membranes with nano-TiO 2 films are fabricated by deposition of titania nanoparticles from a sol solution. Measurements of ion conductivity, methanol permeability and single-cell performance of the modified Nafion membranes are conducted. The TiO 2 films adhere well and are crack-free. The protonic conductivity of the composite membranes decreases with increasing titania content, but methanol permeability is reduced. Preliminary tests on a single-cell of a direct methanol fuel cell (DMFC) indicate that a titania-coated membrane with 0.009 mg cm −2 content gives the highest cell voltage and maximum power density.

Journal of Power Sources, 2007

Platinum (Pt) and platinum-ruthenium (PtRu) nanoparticles supported on Vulcan XC-72 carbon and si... more Platinum (Pt) and platinum-ruthenium (PtRu) nanoparticles supported on Vulcan XC-72 carbon and single-wall carbon nanotubes (SWCNT) are prepared by a microwave-assisted polyol process. The catalysts are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The PtRu nanoparticles, which are uniformly dispersed on carbon, have diameters of 2-6 nm. All the PtRu/C catalysts display the characteristic diffraction peaks of a face centred cubic Pt structure, excepting that the 2θ values are shifted to slightly higher values. The results from XPS analysis reveal that the catalysts contain mostly Pt(0) and Ru(0), with traces of Pt(II), Pt(IV) and Ru(IV). The electrooxidation of methanol is studied by cyclic voltammetry, linear sweep voltammetry, and chronoamperometry. Both PtRu/C catalysts have high and more durable electrocatalytic activities for methanol oxidation than a comparative Pt/C catalyst. Preliminary data from a single direct methanol fuel cell using the SWCNT supported PtRu alloy as the anode catalyst delivers high power density.

Industrial & Engineering Chemistry Research, 2003

ABSTRACT

Surface & Coatings Technology, 2005

Transparent porous TiO2 thin film was spin-coated on glass substrates from a sol gel solution con... more Transparent porous TiO2 thin film was spin-coated on glass substrates from a sol gel solution containing titanium alkoxide as precursor. Polyethylene glycol (PEG), with different molecular weight, was added to the coating solution as a structure-directing agent, and the films thus prepared were transparent, crack free and nanoporous. The surface morphology of the films has been observed by field emission

Journal of Physics and Chemistry of Solids, 2005

... In light of ionic radii, Ln 3+ (Sm 3+ , Ce 3+ , Er 3+ , Pr 3+ , La 3+ , Nd 3+ and Gd 3+ ) (0.... more ... In light of ionic radii, Ln 3+ (Sm 3+ , Ce 3+ , Er 3+ , Pr 3+ , La 3+ , Nd 3+ and Gd 3+ ) (0.94–1.15 Å ... As lanthanide oxide exhibits unique properties to enhance photocatalytic performance of TiO 2 , the present work focus on synthesis and assessment of the ... Sample characterization. ...

Journal of Power Sources, 2006

Composite polymer electrolyte membranes with nano-TiO 2 films are fabricated by deposition of tit... more Composite polymer electrolyte membranes with nano-TiO 2 films are fabricated by deposition of titania nanoparticles from a sol solution. Measurements of ion conductivity, methanol permeability and single-cell performance of the modified Nafion membranes are conducted. The TiO 2 films adhere well and are crack-free. The protonic conductivity of the composite membranes decreases with increasing titania content, but methanol permeability is reduced. Preliminary tests on a single-cell of a direct methanol fuel cell (DMFC) indicate that a titania-coated membrane with 0.009 mg cm −2 content gives the highest cell voltage and maximum power density.

Journal of Power Sources, 2007

Platinum (Pt) and platinum-ruthenium (PtRu) nanoparticles supported on Vulcan XC-72 carbon and si... more Platinum (Pt) and platinum-ruthenium (PtRu) nanoparticles supported on Vulcan XC-72 carbon and single-wall carbon nanotubes (SWCNT) are prepared by a microwave-assisted polyol process. The catalysts are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The PtRu nanoparticles, which are uniformly dispersed on carbon, have diameters of 2-6 nm. All the PtRu/C catalysts display the characteristic diffraction peaks of a face centred cubic Pt structure, excepting that the 2θ values are shifted to slightly higher values. The results from XPS analysis reveal that the catalysts contain mostly Pt(0) and Ru(0), with traces of Pt(II), Pt(IV) and Ru(IV). The electrooxidation of methanol is studied by cyclic voltammetry, linear sweep voltammetry, and chronoamperometry. Both PtRu/C catalysts have high and more durable electrocatalytic activities for methanol oxidation than a comparative Pt/C catalyst. Preliminary data from a single direct methanol fuel cell using the SWCNT supported PtRu alloy as the anode catalyst delivers high power density.

Industrial & Engineering Chemistry Research, 2003

ABSTRACT

Surface & Coatings Technology, 2005

Transparent porous TiO2 thin film was spin-coated on glass substrates from a sol gel solution con... more Transparent porous TiO2 thin film was spin-coated on glass substrates from a sol gel solution containing titanium alkoxide as precursor. Polyethylene glycol (PEG), with different molecular weight, was added to the coating solution as a structure-directing agent, and the films thus prepared were transparent, crack free and nanoporous. The surface morphology of the films has been observed by field emission

Journal of Physics and Chemistry of Solids, 2005

... In light of ionic radii, Ln 3+ (Sm 3+ , Ce 3+ , Er 3+ , Pr 3+ , La 3+ , Nd 3+ and Gd 3+ ) (0.... more ... In light of ionic radii, Ln 3+ (Sm 3+ , Ce 3+ , Er 3+ , Pr 3+ , La 3+ , Nd 3+ and Gd 3+ ) (0.94–1.15 Å ... As lanthanide oxide exhibits unique properties to enhance photocatalytic performance of TiO 2 , the present work focus on synthesis and assessment of the ... Sample characterization. ...

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