Oxygen reduction on platinum low-index single-crystal surfaces in sulfuric acid solution. Rotating ring - Pt(hkl) disk studies

Journal Article · Thu Mar 16 00:00:00 EST 1995 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100011a001· OSTI ID:35477

Markovic, N M; Gasteiger, H A; Ross, Jr, P N ^[1]

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

The first results of a study of the oxygen reduction reaction on a rotating ring-disk electrode using single-crystal Pt disk electrodes are presented. The order of activity of Pt(hkl) in H{sub 2}SO{sub 4} increased in the sequence (111) < (100) < (110). These differences are attributed to the structure sensitivity of (bi)sulfate anion adsorption and its inhibiting effect. Very small fluxes (I{sub R}/N < 0.01I{sub D}) of peoxide were detected at the ring at potentials above 0 V (SCE) on all surfaces. However, below 0 V absorbed hydrogen affected the partial reduction of oxygen to H{sub 2}O{sub 2} in the order (111) < (100) > (110), with 100% H{sub 2}O{sub 2} formation on Pt(111). 30 refs., 4 figs.

• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 35477
• Journal Information: Journal of Physical Chemistry, Vol. 99, Issue 11; Other Information: PBD: 16 Mar 1995
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
OXYGEN
REDUCTION
PLATINUM
ELECTRODES
ELECTROCHEMISTRY
SULFURIC ACID
MONOCRYSTALS
PEROXIDES
CHEMICAL REACTION KINETICS
ELECTRIC POTENTIAL
VOLTAMETRY