Bromide adsorption on Pt(111): Adsorption isotherm and electrosorption valency deduced from RRD{sub Pt(111)}E measurements

Journal Article · Wed Mar 20 04:00:00 EST 1996 · Langmuir

DOI:https://doi.org/10.1021/la950826s· OSTI ID:226710

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

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

The rotating ring-disk electrode technique with a Pt(111) single crystal in the disk position is used to establish, for the first time, both the bromide adsorption isotherm and its electrosorption valency on Pt(111). In 0.1 M HClO{sub 4}, with =10{sup -4} M Br{sup -}, bromide adsorption begins at ca. -0.15 V (SCE) and reaches a coverage of =0.42 ML at 0.5 V; the electrosorption valency is essentially unity. By subtracting the bromide flux from the Pt(111)-disk current, we were able to deconvolute hydrogen adsorption/desorption processes in the presence of bromide. The major peak in the voltammetry at ca. -0.1 V is the simultaneous desorption/adsorption of hydrogen and adsorption/desorption of bromide. Furthermore, we demonstrated that the saturation coverage of adsorbed hydrogen on Pt(111) is =160 {mu}C/cm{sup 2}. 32 refs., 4 figs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 226710
• Journal Information: Langmuir, Journal Name: Langmuir Journal Issue: 6 Vol. 12; ISSN 0743-7463; ISSN LANGD5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ADSORPTION
ADSORPTION ISOTHERMS
BROMIDES
DESORPTION
HYDROGEN
PLATINUM
VALENCE
VOLTAMETRY