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Barrier effect of dendrons on TiO<sub>2</sub> particles in dye sensitized solar cells
Shin, Bongha,Won, Jongok,Son, Taewook,Kang, Yong Soo,Kim, Chan Kyung Royal Society of Chemistry 2011 Chemical communications Vol.47 No.6
<P>The short circuit current of dye sensitised solar cells increased significantly by the simple addition of polyester hydroxyl acetylene bis(hydroxymethyl)propanoic acid dendrons on TiO<SUB>2</SUB> nanoparticles, resulting in a very high overall energy conversion efficiency.</P> <P>Graphic Abstract</P><P>The short circuit current of DSSCs increased significantly by the simple addition of dendrons on TiO<SUB>2</SUB> nanoparticles, resulting in a very high overall energy conversion efficiency. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc03851b'> </P>
Lee Jin Hwa,Won Jongok,Oh In Hwan,Ha Heung Yong,Cho Eun Ae,Kang Yong Soo The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.1
The transport of reactant gas, electrons and protons at the three phase interfaces in the catalytic layers of membrane electrode assemblies (MEAs) in proton exchange, membrane fuel cells (PEMFCs) must be optimized to provide efficient transport to and from the electrochemical reactions in the solid polymer electrolyte. The aim of reducing proton transport loss in the catalytic layer by increasing the volume of the conducting medium can be achieved by filling the voids in the layer with small-sized electrolytes, such as dendrimers. Generation 1.5 and 3.5 polyamidoamine (PAMAM) dendrimer electrolytes are well-controlled, nanometer-sized materials with many peripheral ionic exchange, -COOH groups and were used for this purpose in this study. The electrochemically active surface area of the deposited catalyst material was also investigated using cyclic voltammetry, and by analyzing the Pt-H oxidation peak. The performances of the fuel cells with added PAMAM dendrimers were found to be comparable to that of a fuel cell using MEA, although the Pt utilization was reduced by the adsorption of the dendrimers to the catalytic layer.
Park Su Mi,Won Jongok,Lee Myung-Jin,Kang Yong Soo,Kim Se-Hye,Kim Youngmee,Kim Sung-Jin The Polymer Society of Korea 2004 Macromolecular Research Vol.12 No.6
Cellulose nitrate (CN) composite membranes, containing cobalt porphyrin (CoP) complexes self-assembled within nanometer-sized rhenium clusters (ReCoP), have been prepared and their oxygen and nitrogen gas permeabilities were analyzed. The solubility of ReCoP and the characteristics of the corresponding composite membranes were analyzed using a Cahn microbalance, FT-IR spectroscopy, wide-angle X-ray scattering, and differential scanning calorimetry. The nitrogen permeability through the CN composite membranes decreased upon addition of ReCoP and CoP, which implies that the presence of these oxygen carrier complexes affects the structure of the polymer matrix. The oxygen permeability through the composite membranes containing small quantities of ReCoP decreased, but it increased upon increasing the concentration. The oxygen gas transport was affected by the matrix at low ReCoP concentrations, but higher concentrations of ReCoP increased the oxygen permeability as a result of its reversible and specific interactions with oxygen, effectively realizing ReCoP carrier-mediated oxygen transport.