Oxygen reduction on platinum low-index single-crystal surfaces in sulfuric acid solution. Rotating ring - Pt(hkl) disk studies
- 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, Journal Name: Journal of Physical Chemistry Journal Issue: 11 Vol. 99; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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