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Journal Articles

Incorporation of multinuclear copper active sites into nitrogen-doped graphene for electrochemical oxygen reduction

Kato, Masaru*; Muto, Marika*; Matsubara, Naohiro*; Uemura, Yohei*; Wakisaka, Yuki*; Yoneuchi, Tsubasa*; Matsumura, Daiju; Ishibara, Tomoko*; Tokushima, Takashi*; Noro, Shinichiro*; et al.

ACS Applied Energy Materials (Internet), 1(5), p.2358 - 2364, 2018/05

https://doi.org/10.1021/acsaem.8b00491

Times Cited Count：12 Percentile：43.4(Chemistry, Physical)

Journal Articles

In situ electrochemical, electrochemical quartz crystal microbalance, scanning tunneling microscopy, and surface X-ray scattering studies on Ag/AgCl reaction at the underpotentially deposited Ag bilayer on the Au(111) electrode surface

Uosaki, Kohei*; Morita, Jun*; Katsuzaki, Tomoko*; Takakusagi, Satoru*; Tamura, Kazuhisa; Takahashi, Masamitsu; Mizuki, Junichiro; Kondo, Toshihiro*

Journal of Physical Chemistry C, 115(25), p.12471 - 12482, 2011/06

https://doi.org/10.1021/jp2010502

Times Cited Count：13 Percentile：40.16(Chemistry, Physical)

Ag/AgCl reaction at the Ag bilayer, which was underpotentially prepared on a Au(111) surface, was investigated using electrochemical quartz crystal microbalance (EQCM), scanning tunneling microscopy (STM), surface X-ray scattering (SXS), and electrochemical techniques. When the potential was scanned positively from -200 mV, the Cl $^{-}$ ion was adsorbed on the Au(111) electrode surface around 0 mV, and then the phase transition of the adsorbed Cl $^{-}$ ion layer from random orientation to ( ) structure took place at around +130 mV. The Ag bilayer and Cl $^{-}$ ions were oxidatively reacted to form the AgCl monolayer with ( ) 13.9 $^{circ}$ structure around +200 mV, accompanied with the formation of AgCl monocrystalline clusters on the AgCl monolayer surface. The structure of the AgCl monolayer on the Au(111) surface was changed from ( )R13.9 $^{circ}$ structure to (44) structure around +500 mV.

Journal Articles

Partial stripping of Ag atoms from silver bilayer on a Au(111) surface accompanied with the reductive desorption of hexanethiol SAM

Kondo, Toshihiro*; Tamura, Kazuhisa; Takakusagi, Satoru*; Kitamura, Ken*; Takahashi, Masamitsu; Mizuki, Junichiro; Uosaki, Kohei*

Journal of Solid State Electrochemistry, 13(7), p.1141 - 1145, 2009/07

https://doi.org/10.1007/s10008-008-0764-3

Times Cited Count：6 Percentile：14.88(Electrochemistry)

The interfacial structures of Ag bilayer prepared by underpotential deposition on Au(111) were determined by STM and SXS before and after oxidative adsorption and after desorption of a SAM of C $_{6}$ SH in alkaline ethanol solution. While no structural change was observed after oxidative formation of C $_{6}$ SH SAM on the Ag/Au(111) in an ethanol solution containing 20 mM KOH and 0.1 mM C $_{6}$ SH, some of the Ag atoms in the bilayer were stripped when the SAM was reductively desorbed.

Journal Articles

Structure of Au(111) and Au(100) single-crystal electrode surfaces at various potentials in sulfuric acid solution determined by in situ surface X-ray scattering

Kondo, Toshihiro*; Morita, Jun*; Hanaoka, Kazuya*; Takakusagi, Satoru*; Tamura, Kazuhisa; Takahashi, Masamitsu; Mizuki, Junichiro; Uosaki, Kohei*

Journal of Physical Chemistry C, 111(35), p.13197 - 13204, 2007/09

https://doi.org/10.1021/jp072601j

Times Cited Count：84 Percentile：89.36(Chemistry, Physical)

Potential-dependent surface structures of Au(111) and Au(100) single-crystal electrodes in a 50 mM H $_{2}$ SO $_{4}$ solution were investigated at an atomic level using in situ surface X-ray scattering (SXS) techniques. It was confirmed that both the Au(111) and Au(100) surfaces were reconstructed with an attached submonolayer of an oxygen species, most probably water, at 0 V (vs Ag/AgCl). Results at +0.95 V supported a previously suggested model for both the Au(111) and the Au(100) electrodes that, based on infrared and scanning tunneling microscopy measurements, the surfaces were a (11) structure with the coadsorbed sulfate anion and hydronium cation (H $_{3}$ O $^{+}$ ). At +1.05 V, where a small amount of an anodic current flowed, adsorption of a monolayer of oxygen species was observed on both surfaces.