Yoshio Hori
Chiba University
Publications 82
#1Yoshio Hori (Chiba University)H-Index: 29
Electrochemical Reduction of CO2 may contribute to energy storage process. It has been a challenging subject, since it competes with hydrogen evolution in aqueous electrolytes. The studies started in the beginning of 20th century using metal electrodes of high hydrogen overvoltage, and the main product remained formate for long time. A breakthrough appeared in 1980s; Cu electrode gives rise to hydrocarbons, and Au and Ag form CO. This chapter provides an overview of the electrocatalysis of metal...
10 CitationsSource
#1Nagahiro Hoshi (Chiba University)H-Index: 23
#2Osamu Koga (Chiba University)H-Index: 14
Last.Takehiko Ogawa (Chiba University)H-Index: 2
view all 4 authors...
Abstract The binding positions (terraces, steps) and sites (on-top, bridge-bonded, threefold) of adsorbed CO have been studied on Pd(S)-[ n (1 1 1) × (1 1 1)] ( n = 2, 3, 5, 9, 20, ∞) and Pd(S)-[ n (1 0 0) × (1 1 1)] ( n = 2, 5, 9, ∞) electrodes in 0.1 M HClO 4 saturated with CO using infrared reflection absorption spectroscopy (IRAS). The band of threefold CO is observed around 1950 cm −1 on Pd(S)-[ n (1 1 1) × (1 1 1)] electrodes with terrace atomic rows n ⩾ 5. The band intensity is enhanced w...
13 CitationsSource
#1Yoshio Hori (Chiba University)H-Index: 29
#2H. Konishi (Chiba University)H-Index: 1
Last.K. Oguma (Chiba University)H-Index: 1
view all 7 authors...
Abstract Metallic Cu electrode can electrochemically reduce CO 2 to CH 4 , C 2 H 4 and alcohols with high yields as revealed by the present authors. Many workers reported that formation of CH 4 and C 2 H 4 rapidly diminishes during electrolysis of CO 2 reduction. This paper shows that such deactivation of Cu electrode is reproduced with electrolyte solutions prepared from reagents used by these workers. Deactivated Cu electrodes recovered the electrocatalytic activity for CO 2 reduction by anodi...
166 CitationsSource
#1Osamu Koga (Chiba University)H-Index: 14
#2S. Teruya (Chiba University)H-Index: 2
Last.Yoshio Hori (Chiba University)H-Index: 29
view all 6 authors...
Abstract Voltammetric and infrared (IR) spectroscopic measurements were carried out to study adsorbed CO on two series of copper single crystal electrodes n (1 1 1)–(1 1 1) and n (1 1 1)–(1 0 0) in 0.1 M KH 2 PO 4 + 0.1 M K 2 HPO 4 at 0 °C. Reversible voltammetric waves were observed below −0.55 V versus SHE for adsorption of CO which displaces preadsorbed phosphate anions. The electric charge of the redox waves is proportional to the step atom density for both single crystal series. This fact i...
9 CitationsSource
#1Nagahiro Hoshi (Chiba University)H-Index: 23
#2Keisuke Sasaki (Chiba University)H-Index: 1
Last.Yoshio Hori (Chiba University)H-Index: 29
view all 4 authors...
Dechlorination of chlorobenzene has been studied in acetonitrile on metal electrodes (Pt, Cd, Sn, In, Pb, Zn, Ag) using naphthalene as a mediator. Voltammograms of the metal electrodes, except Pt, give redox peaks at −2.94 V (Ag∣Ag+) in the solution containing 10 mM of naphthalene. The cathodic peak at −2.94 V is enhanced with an increase of the concentration of chlorobenzene, evidence that chlorobenzene is also reduced at this potential. The current density of the enhanced cathodic peak depends...
19 CitationsSource
#1Nagahiro HoshiH-Index: 23
#2Makiko KurodaH-Index: 3
Last.Yoshio HoriH-Index: 29
view all 5 authors...
Adsorption of the sulfuric acid anion (HSO4- or SO42-) has been studied on Pd(S)−[n(111) × (111)] electrodes (n = 2, 3, 5, 9, 20, infinity) using in situ infrared reflection absorption spectroscopy (IRAS). A single band is observed around 1200 cm-1 on all the electrodes. The band is assigned to the SO stretching vibration of the sulfuric acid anion adsorbed with three- or onefold geometry. This result differs from the case of Pt-stepped surfaces on which two IRAS bands are observed around 1200 a...
18 CitationsSource
#1Yoshio Hori (Chiba University)H-Index: 29
#2H Ito (Chiba University)H-Index: 1
Last.S Sato (Chiba University)H-Index: 1
view all 5 authors...
Silver-coated ion exchange membrane electrodes (solid polymer electrolyte, SPE) were prepared by electroless deposition of silver onto ion exchange membranes. The SPE electrodes were used for carbon dioxide (CO2) reduction with 0.2 M K2SO4 as the electrolyte with a platinum plate (Pt) for the counterelectrode. In an SPE electrode system prepared from a cation exchange membrane (CEM), the surface of the SPE was partly ruptured during CO2 reduction, and the reaction was rapidly suppressed. SPE ele...
57 CitationsSource
#1Yoshio Hori (Chiba University)H-Index: 29
#2Ichiro Takahashi (Chiba University)H-Index: 11
Last.Nagahiro Hoshi (Chiba University)H-Index: 23
view all 4 authors...
Electrochemical reduction of carbon dioxide was studied with various series of copper single crystal electrodes in 0.1 M KHCO3 aqueous solution at constant current density 5 mA cm−2; the electrodes employed are Cu(S)-[n(100)×(111)], Cu(S)-[n(100)×(110)], Cu(S)-[n(111)×(100)], Cu(S)-[n(111)×(111)] and Cu(S)-[n(110)×(100)]. The electrodes based on (1 0 0) terrace surface give ethylene as the major product. The ethylene formation is further promoted by the introduction of (1 1 1) or (1 1 0) steps t...
205 CitationsSource
#1Yoshio HoriH-Index: 29
#2Kazumi MurataH-Index: 1
Last.Takayoshi OkuH-Index: 1
view all 3 authors...
Electrochemical reduction of chloroform was studied in 0.1 M (1 M = 1 mol dm−3) tetraethyl ammonium perchlorate solutions of acetonitrile–water mixture using various metal electrodes. High water concentration (1 M) promoted the electrolysis with the products mainly CH4 and CH2Cl2. The partial current density of CH4 formation amounted to 0.3 A cm−2 at an Ag electrode.
22 CitationsSource
#1Nagahiro Hoshi (Chiba University)H-Index: 23
#2Eicho Sato (Chiba University)H-Index: 1
Last.Yoshio Hori (Chiba University)H-Index: 29
view all 3 authors...
Structural effects on the rate of CO2 reduction are studied on kinked stepped surfaces of Pt inside the stereographic triangle. The surfaces examined are Pt(431), Pt(531) and Pt(532), which consist of two or three atomic rows of (111) terraces and (111) or (100) steps incorporated with kink atoms. The rate of CO2 reduction is enhanced with the increase of the kink atom density. The kinked stepped surfaces have a higher activity for CO2 reduction than the analogous stepped surfaces that have simi...
34 CitationsSource