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The adsorption of bisulfate and sulfate anions over a Pt(1 1 1) electrode: A first principle study of adsorption configurations, vibrational frequencies and linear sweep voltammogram simulations

Paper ID Volume ID Publish Year Pages File Format Full-Text
54992 47036 2013 16 PDF Available
Title
The adsorption of bisulfate and sulfate anions over a Pt(1 1 1) electrode: A first principle study of adsorption configurations, vibrational frequencies and linear sweep voltammogram simulations
Abstract

Specific anion adsorption of sulfate and bisulfate anions to the Pt(1 1 1) surface was studied using periodic density functional theory (DFT) methods. The origins of experimentally observed voltammetric features have been assigned based on comparison of calculated vibrational frequencies and simulated linear sweep voltammograms (LSVs) to experimental data available in the literature. The inclusion of solvation in the electrochemical model well-predicts the bisulfate and sulfate adsorption potentials. Combined with vibrational frequency analysis, sulfate is identified as the dominant adsorption species over the (bi)sulfate adsorption potential region. Rapid increase of coverage with electrode potential causes a sharp peak in the simulated voltammogram. We have assigned the experimental characteristic vibrational mode of adsorbed (bi)sulfate in the 1200–1300 cm−1 range as an S–Ouncoordinated stretch. The Stark tuning slope of the S–Ouncoordinated frequency for sulfate containing (√3 × √7) superstructures was calculated for different co-adsorbed species to resolve possible molecular structures for this adlayer. The oxidation of co-adsorbed water to surface hydroxyl at (√3 × √7) adlayer causes a decrease of the Stark tuning slope and a high potential feature in the voltammogram. The adsorption of a series of sulfonic acids to Pt(1 1 1) is considered, and the calculated adsorption equilibrium potential is observed to correlate linearly with the sulfonate proton affinity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (276 K)Download as PowerPoint slideHighlights► Adsorption of (bi)sulfate anions to Pt(1 1 1) was studied using periodic DFT methods. ► Calculated vibrational frequencies and simulated LSVs help assign LSV features. ► Sulfate is identified as the dominant adsorption species. ► The experimental characteristic vibrational mode of adsorbed (bi)sulfate is assigned. ► Sulfonate adsorption equilibrium potential correlates linearly with proton affinity.

Keywords
Anion adsorption; DFT; Stark tuning; Voltammetry; Simulation
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The adsorption of bisulfate and sulfate anions over a Pt(1 1 1) electrode: A first principle study of adsorption configurations, vibrational frequencies and linear sweep voltammogram simulations
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 202, 15 March 2013, Pages 20–35
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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