title: Self-assembly of active IrO2 colloid catalyst on an ITO electrode for efficient electrochemical water oxidation.
abstract: Active catalysts for water oxidation to evolve O(2) are required for the construction of artificial photosynthetic devices that are expected to be promising energy-providing systems in the future. The citrate-stabilized IrO(2) colloid was self-assembled onto an indium tin oxide (ITO) electrode to form a monolayer of the colloidal IrO(2) particles when it was dipped in the colloid solution. The self-assembly could be achieved by a chemical interaction between carboxylate groups on the citrate stabilizer and hydroxyl groups on the ITO surface to form ester bonds. Efficient electrocatalysis for water oxidation was demonstrated using the electrode modified by the self-assembled IrO(2) colloid to yield the highest turnover frequency ((2.3-2.5) x 10(4) h(-1)) of IrO(2) in the hitherto-reported catalysts for electrochemical water oxidation.
authors.affiliation: Faculty of Education and Human Sciences, and Center for Transdisciplinary Research, Niigata University, 8050 Ikarashi-2, Niigata 950-2181, Japan. yagi@ed.niigata-u.ac.jp
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yagi
authors.forename: Emi
authors.initials: E
authors.lastname: Tomita
authors.forename: Sayaka
authors.initials: S
authors.lastname: Sakita
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kuwabara
authors.forename: Keiji
authors.initials: K
authors.lastname: Nagai
mesh_terms: D002384:Catalysis; D003102:Colloids / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D007495:Iridium / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D013997:Time Factors; D017971:Tin Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D003102:Colloids; D017971:Tin Compounds; D014867:Water; C044458:iridium oxide; D007495:Iridium; C109984:indium tin oxide; D010100:Oxygen