Ozone electrogeneration on Pt-TaOy sol-gel film modified titanium electrode: Effect of electrode composition on the electrocatalytic activity

doi:10.1016/S2095-4956(15)60298-4

能源化学(英文) ›› 2015, Vol. 21 ›› Issue (2): 178-184.DOI: 10.1016/S2095-4956(15)60298-4

Ozone electrogeneration on Pt-TaO_y sol-gel film modified titanium electrode: Effect of electrode composition on the electrocatalytic activity

Mohamed I. Awad^a,b,e, Shunsuke Sata^a, Kazuhiro Kaneda^c, Mineo Ikematsu^d, Takeo Ohsaka^a

a. Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan;
b. Chemistry Department, Faculty of Science, Cairo University 12613, Egypt;
c. Department of the Humanities, Ibaraki College, National Institute of Technology, 866 Nakane, Hitachinaka, Ibaraki 312-8508, Japan;
d. Faculty of Engineering, Tokyo University of Science, Yamaguchi 1-1-1 Daigaku-Dori, Sanyo-Onoda, Yamaguchi 756-0884, Japane. Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah Al-Mukarramah 6055, Saudi Arabia

收稿日期:2014-11-12 修回日期:2015-01-04 出版日期:2015-03-23 发布日期:2015-03-23
通讯作者: Takeo Ohsaka

Ozone electrogeneration on Pt-TaO_y sol-gel film modified titanium electrode: Effect of electrode composition on the electrocatalytic activity

Mohamed I. Awad^a,b,e, Shunsuke Sata^a, Kazuhiro Kaneda^c, Mineo Ikematsu^d, Takeo Ohsaka^a

a. Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan;
b. Chemistry Department, Faculty of Science, Cairo University 12613, Egypt;
c. Department of the Humanities, Ibaraki College, National Institute of Technology, 866 Nakane, Hitachinaka, Ibaraki 312-8508, Japan;
d. Faculty of Engineering, Tokyo University of Science, Yamaguchi 1-1-1 Daigaku-Dori, Sanyo-Onoda, Yamaguchi 756-0884, Japane. Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah Al-Mukarramah 6055, Saudi Arabia

Received:2014-11-12 Revised:2015-01-04 Online:2015-03-23 Published:2015-03-23
Contact: Takeo Ohsaka

摘要/Abstract

摘要： This work examines the ozone electrogeneration (OE) at a binary coating of different nominal compositions (Pt)_x-(TaO_y)_(100-x), where x (percentage in the precursor solution) varied between 1% and 100%, coated on titanium substrate prepared by a sol-gel technique. The OE is performed in an artificial tap water at room temperature (25℃). The percentages of Pt and TaO_y in the coating significantly affect the electrocatalytic activity towards oxygen evolution. The oxygen evolution was retarded to a different extent based on the electrode composition. The largest retardation was obtained at the (Pt)₁₀-(TaO_y)₉₀ electrode (ca. 480mV positive shift) as compared with the (Pt)₁₀₀-(TaO_y)₀ electrode. This was reflected in a high current efficiency (CE) of OE (ca. 19.3%) at the former electrode. This value is considered to be among the highest values reported for OE at 25℃ in neutral media. The composite electrodes were characterized by voltammetric and surface techniques. A plausible explanation for the change of the efficiency of OE with the electrode composition is given based on the electrochemical results.

关键词: ozone, electrocatalysis, oxygen evolution, dimensionally stable anode, sol-gel

Abstract: This work examines the ozone electrogeneration (OE) at a binary coating of different nominal compositions (Pt)_x-(TaO_y)_(100-x), where x (percentage in the precursor solution) varied between 1% and 100%, coated on titanium substrate prepared by a sol-gel technique. The OE is performed in an artificial tap water at room temperature (25℃). The percentages of Pt and TaO_y in the coating significantly affect the electrocatalytic activity towards oxygen evolution. The oxygen evolution was retarded to a different extent based on the electrode composition. The largest retardation was obtained at the (Pt)₁₀-(TaO_y)₉₀ electrode (ca. 480mV positive shift) as compared with the (Pt)₁₀₀-(TaO_y)₀ electrode. This was reflected in a high current efficiency (CE) of OE (ca. 19.3%) at the former electrode. This value is considered to be among the highest values reported for OE at 25℃ in neutral media. The composite electrodes were characterized by voltammetric and surface techniques. A plausible explanation for the change of the efficiency of OE with the electrode composition is given based on the electrochemical results.

Key words: ozone, electrocatalysis, oxygen evolution, dimensionally stable anode, sol-gel

Mohamed I. Awad, Shunsuke Sata, Kazuhiro Kaneda, Mineo Ikematsu, Takeo Ohsaka. Ozone electrogeneration on Pt-TaO_y sol-gel film modified titanium electrode: Effect of electrode composition on the electrocatalytic activity[J]. 能源化学(英文), 2015, 21(2): 178-184.

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Ozone electrogeneration on Pt-TaO_y sol-gel film modified titanium electrode: Effect of electrode composition on the electrocatalytic activity

Ozone electrogeneration on Pt-TaO_y sol-gel film modified titanium electrode: Effect of electrode composition on the electrocatalytic activity

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