Oxygen and hydrogen peroxide reduction on the Au(100) surface in alkaline electrolyte. The roles of surface structure and hydroxide adsorption

Journal Article · Sat Jan 01 00:00:00 EST 1994 · Langmuir; (United States)

DOI:https://doi.org/10.1021/la00013a001· OSTI ID:5146056

Markovic, N M; Tidswell, I M; Ross, P N ^[1]

---

1. Lawrence Berkeley Lab., CA (United States)

The reduction of oxygen and hydrogen peroxide on the Au(100) surface has been studied using classical electroanalytic methods combined with in situ X-ray scattering techniques in order to relate surface structure to the kinetics. Confirming previous results, the 4e[sup [minus]] reduction pathway for O[sub 2] at low overpotentials gives way to a 2e[sup [minus]] path at higher overpotentials. It was determined that, contrary to previous speculation, the (1 [times] 1) [yields] hex' reconstruction transition is not the dominant mechanism for this change in reaction pathway since the transition in reduction kinetics occurs in a much narrower potential range than the (1 [times] 1) [yields] hex' transition. The time constants for the two transitions differ by approximately 2 orders of magnitude, with the structural transition the slower. We suggest that the change in reaction pathway is related to the potential dependence of the adsorption of hydroxyl anions that catalyze the reduction of peroxide. 15 refs., 2 figs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5146056
• Journal Information: Langmuir; (United States), Vol. 10:1; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROGEN PEROXIDE
REDUCTION
HYDROXIDES
ADSORPTION
OXYGEN
X RADIATION
SCATTERING
CATALYSIS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
GOLD
VOLTAMETRY
CHEMICAL REACTIONS
CHEMISTRY
ELECTROMAGNETIC RADIATION
ELEMENTS
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
METALS
NONMETALS
OXYGEN COMPOUNDS
PEROXIDES
RADIATIONS
SORPTION
TRANSITION ELEMENTS
400400* - Electrochemistry
400201 - Chemical & Physicochemical Properties