title: Structural effects of electrochemical oxidation of formic acid on single crystal electrodes of palladium.
abstract: Structural effects on the rates of formic acid oxidation have been studied on Pd(111), Pd(100), Pd(110), and Pd(S)-[n(100) x (111)] (n = 2-9) electrodes in 0.1 M HClO4 containing 0.1 M formic acid with use of voltammetry. On the low index planes of Pd, the maximum current density of formic acid oxidation (jP) increases in the positive scan as follows: Pd(110) < Pd(111) < Pd(100). This order differs from that on the low index planes of Pt: Pt(111) < Pt(100) < Pt(110). Pd(S)-[n(100) x (111)] electrodes with terrace atomic rows n > or = 3 have almost the same jP as Pd(100), except Pd(911) n = 5. The value of jP on Pd(911) n = 5 is 20% higher than those of the other surfaces. Pd(311) n = 2, of which the first layer is composed of only step atoms, has the lowest jP in the Pd(S)-[n(100) x (111)] series. The adsorption geometry of the reaction intermediate (formate ion) is optimized by using density functional theory.
authors.affiliation: Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. hoshi@faculty.chiba-u.jp
authors.forename: Nagahiro
authors.initials: N
authors.lastname: Hoshi
authors.forename: Kaori
authors.initials: K
authors.lastname: Kida
authors.forename: Masashi
authors.initials: M
authors.lastname: Nakamura
authors.forename: Miou
authors.initials: M
authors.lastname: Nakada
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Osada