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Lee, Kiyoung,Kim, Doohun,Schmuki, Patrik Royal Society of Chemistry 2011 Chemical communications Vol.47 No.20
<P>In the present work, we report on the self-organized growth of TiO<SUB>2</SUB> layers consisting of a highly aligned nanochannel morphology. We show that an electrochemical anodization process of Ti in a hot glycerol/K<SUB>2</SUB>HPO<SUB>4</SUB> electrolyte can be adjusted to yield these self-organized TiO<SUB>2</SUB> structures. The channel diameter and length are controllable by the anodization parameters. This directional structure can, for example, find application in dye-sensitized solar cells.</P> <P>Graphic Abstract</P><P>Highly self-ordered nanochannel TiO<SUB>2</SUB> structures by anodization in a hot glycerol electrolyte. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc11160d'> </P>
Yang, Yang,Albu, Sergiu P.,Kim, Doohun,Schmuki, Patrik WILEY‐VCH Verlag 2011 Angewandte Chemie Vol.123 No.39
<P><B>Vanadiumoxidschichten</B> mit einer homogenen porösen röhrenförmigen Morphologie (siehe Bild) wurden durch direkte anodische Oxidation in [TiF<SUB>6</SUB>]<SUP>2−</SUP>‐ oder [BF<SUB>4</SUB>]<SUP>−</SUP>‐Elektrolyten hergestellt. Porengröße und Schichtdicke können leicht über die elektrochemischen Parameter eingestellt werden. Derartige röhrenförmige oder poröse Strukturen sind vielversprechende Materialien für Lithiumionen‐Elektroden.</P>
이기영,김지영,김혜영,이유진,Doohun Kim,Patrik Schmuki,탁용석 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.3
Ordered TiO2 nanotube arrays can be prepared by anodizing of Ti metal. However, the nanotubular TiO2 structure shows a lack of reproducibility when the Ti metal is repetitively anodized in a prepared solution. The TiO2 tube length increases as the number of anodizations increases. In this work, the effects of the solution conductivity and temperature on the formation of the nanotubular TiO2 structure were analyzed using the measured current transients and tube morphology. Nanotubular TiO2 was tested as an anode for a dye-sensitized solar cell and its performance was interpreted using electrochemical impedance spectroscopy in relation to a morphological study of the TiO2 structure Ordered TiO2 nanotube arrays can be prepared by anodizing of Ti metal. However, the nanotubular TiO2 structure shows a lack of reproducibility when the Ti metal is repetitively anodized in a prepared solution. The TiO2 tube length increases as the number of anodizations increases. In this work, the effects of the solution conductivity and temperature on the formation of the nanotubular TiO2 structure were analyzed using the measured current transients and tube morphology. Nanotubular TiO2 was tested as an anode for a dye-sensitized solar cell and its performance was interpreted using electrochemical impedance spectroscopy in relation to a morphological study of the TiO2 structure
Yang, Yang,Kim, Doohun,Yang, Min,Schmuki, Patrik Royal Society of Chemistry 2011 Chemical communications Vol.47 No.27
<P>Highly ordered mixed V<SUB>2</SUB>O<SUB>5</SUB>–TiO<SUB>2</SUB> nanotubes can be formed by self-organizing anodization of Ti–V alloys with vanadium content of up to 18 at%. In the resulting oxide nanotube arrays, the vanadium is electrochemically switchable leading to a specific capacitance that can reach up to 220 F g<SUP>−1</SUP> and an energy density of 19.56 Wh kg<SUP>−1</SUP> with perfect reversibility and long-term stability. Thus these mixed oxide nanotubes may be considered as a promising candidate for supercapacitors.</P> <P>Graphic Abstract</P><P>Vertically aligned mixed V<SUB>2</SUB>O<SUB>5</SUB>–TiO<SUB>2</SUB> nanotube arrays grown by anodization show promising application in supercapacitor devices. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc11811k'> </P>
Nah, Yoon-Chae,Ghicov, Andrei,Kim, Doohun,Berger, Steffen,Schmuki, Patrik American Chemical Society 2008 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.130 No.48
<P>The present work demonstrates that uniform and highly ordered arrays of TiO(2)-WO(3) nanotubes can be grown by anodization of Ti alloys in an ethylene glycol/fluoride based electrolyte under selected electrochemical conditions. These aligned mixed oxide nanotube structures are highly suitable for enhanced electrochromic reactions; in particular we show that already small amounts of WO(3) (such as 0.2 at%) present in the tube oxide drastically improve the electrochromic properties (contrast, onset potential, cycling stability) of nanotube layer based devices.</P>
Anodically formed transparent mesoporous TiO<sub>2</sub> electrodes for high electrochromic contrast
Lee, Kiyoung,Kim, Doohun,Berger, Steffen,Kirchgeorg, Robin,Schmuki, Patrik The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.19
<P>In the present work, we show that metallic Ti thin films on FTO glass can be completely anodized to a mesoporous oxide layer using a glycerol–K<SUB>2</SUB>HPO<SUB>4</SUB> electrolyte at elevated temperatures (∼180 °C). This results in highly transparent mesoporous oxide coated electrodes that provide a significantly enhanced transparency compared with the classic nanoparticle layers or TiO<SUB>2</SUB> nanotube layers. We show that in electrochromic switching experiments these electrodes therefore exhibit a significantly higher contrast compared to other TiO<SUB>2</SUB> nanostructures. Moreover, this type of anodic titania layer is produced in a fluoride-free electrolyte and adheres very well to the FTO glass, both features that are highly beneficial in view of an application in electrochromic devices.</P> <P>Graphic Abstract</P><P>We introduce highly transparent TiO<SUB>2</SUB> mesoporous electrodes that show excellent electrochromic properties. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm31244a'> </P>