title: Enhancement of anodic current attributed to oxygen evolution on α-Fe2O3electrode by microwave oscillating electric field.
abstract: Various microwave effects on chemical reactions have been observed, reported and compared to those carried out under conventional heating. These effects are classified into thermal effects, which arise from the temperature rise caused by microwaves, and non-thermal effects, which are attributed to interactions between substances and the oscillating electromagnetic fields of microwaves. However, there have been no direct or intrinsic demonstrations of the non-thermal effects based on physical insights. Here we demonstrate the microwave enhancement of oxidation current of water to generate dioxygen with using an α-Fe2O3electrode induced by pulsed microwave irradiation under constantly applied potential. The rectangular waves of current density under pulsed microwave irradiation were observed, in other words the oxidation current of water was increased instantaneously at the moment of the introduction of microwaves, and stayed stably at the plateau under continuous microwave irradiation. The microwave enhancement was observed only for the α-Fe2O3electrode with the specific surface electronic structure evaluated by electrochemical impedance spectroscopy. This discovery provides a firm evidence of the microwave special non-thermal effect on the electron transfer reactions caused by interaction of oscillating microwaves and irradiated samples.
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology. E4-3, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan.|Research Fellow of Japan Society for the Promotion of Science, Kojimachi Business Center Building, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan.
authors.forename: Fuminao
authors.initials: F
authors.lastname: Kishimoto
authors.affiliation: Department of chemical science and engineering, School of materials and chemical technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Matsuhisa
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology. E4-3, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Kawamura
authors.affiliation: Department of chemical science and engineering, School of materials and chemical technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan.|Department of Information and Communication Systems Engineering, Okinawa National College of Technology, 905 Henoko, Nago-shi, Okinawa 905-2192, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Fujii
authors.affiliation: Department of chemical science and engineering, School of materials and chemical technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Shuntaro
authors.initials: S
authors.lastname: Tsubaki
authors.affiliation: Department of chemical science and engineering, School of materials and chemical technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Masato M
authors.initials: MM
authors.lastname: Maitani
authors.affiliation: Department of chemical science and engineering, School of materials and chemical technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Eiichi
authors.initials: E
authors.lastname: Suzuki
authors.affiliation: Department of chemical science and engineering, School of materials and chemical technology, Tokyo Institute of Technology, E4-3, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Wada