title: Preparation of a platinum electrocatalyst by coaxial pulse arc plasma deposition.
abstract: We have developed a new method of preparing Pt electrocatalysts through a dry process. By coaxial pulse arc plasma deposition (CAPD), highly ionized metal plasma can be generated from a target rod without any discharged gases, and Pt nanoparticles can be deposited on a carbon support. The small-sized Pt nanoparticles are distributed over the entire carbon surface. From transmission electron microscopy (TEM), the average size of the deposited Pt nanoparticles is estimated to be 2.5 nm, and their size distribution is narrow. Our electrocatalyst shows considerably improved catalytic activity and stability toward methanol oxidation reaction (MOR) compared with commercially available Pt catalysts such as Pt black and Pt/carbon (PtC). Inspired by its very high efficiency toward MOR, we also measured the catalytic performance for oxygen reduction reaction (ORR). Our PtC catalyst shows a better performance with half-wave potential of 0.87 V, which is higher than those of commercially available Pt catalysts. The higher performance is also supported by a right-shifted onset potential. Our preparation is simple and could be applied to other metallic nanocrystals as a novel platform in catalysis, fuel cells and biosensors.
authors.affiliation: Arc Plasma Deposition System Business Promotion Division, ULVAC-RIKO, Inc., 4388 Ikonobe-cho, Tsuzuki, Yokohama 224-0053, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Agawa
authors.affiliation: Arc Plasma Deposition System Business Promotion Division, ULVAC-RIKO, Inc., 4388 Ikonobe-cho, Tsuzuki, Yokohama 224-0053, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Tanaka
authors.affiliation: Arc Plasma Deposition System Business Promotion Division, ULVAC-RIKO, Inc., 4388 Ikonobe-cho, Tsuzuki, Yokohama 224-0053, Japan.
authors.forename: Shigemitsu
authors.initials: S
authors.lastname: Torisu
authors.affiliation: Arc Plasma Deposition System Business Promotion Division, ULVAC-RIKO, Inc., 4388 Ikonobe-cho, Tsuzuki, Yokohama 224-0053, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Endo
authors.affiliation: Arc Plasma Deposition System Business Promotion Division, ULVAC-RIKO, Inc., 4388 Ikonobe-cho, Tsuzuki, Yokohama 224-0053, Japan.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Tsujimoto
authors.affiliation: Arc Plasma Deposition System Business Promotion Division, ULVAC-RIKO, Inc., 4388 Ikonobe-cho, Tsuzuki, Yokohama 224-0053, Japan.
authors.forename: Narishi
authors.initials: N
authors.lastname: Gonohe
authors.affiliation: International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 Japan.
authors.forename: Victor
authors.initials: V
authors.lastname: Malgras
authors.affiliation: Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
authors.forename: Ali
authors.initials: A
authors.lastname: Aldalbahi
authors.affiliation: Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
authors.forename: Saad M
authors.initials: SM
authors.lastname: Alshehri
authors.affiliation: International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Kamachi
authors.affiliation: International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 Japan.
authors.forename: Cuiling
authors.initials: C
authors.lastname: Li
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yamauchi
keywords: Pt nanoparticles; electrocatalysts; methanol oxidation