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Electrodeposition

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...

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A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

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Published on: April 10, 2019

Adsorption processes on a Pd monolayer-modified Pt(111) electrode.

Xiaoting Chen¹, Laura P Granda-Marulanda¹, Ian T McCrum¹

¹Leiden Institute of Chemistry, Leiden University PO Box 9502 Leiden 2300 RA The Netherlands m.koper@chem.leidenuniv.nl.

Chemical Science

|June 4, 2021

Summary

This summary is machine-generated.

Specific anion adsorption impacts electrochemical reactions. On Pd monolayer Pt(111), perchlorate adsorption influences hydrogen and hydroxyl regions, unlike ideal electrolytes.

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Area of Science:

Surface Electrochemistry
Electrocatalysis
Materials Science

Background:

Anion adsorption significantly affects electrochemical reaction kinetics on electrode surfaces.
Perchloric acid is often used as an ideal electrolyte due to minimal perchlorate anion adsorption.
Understanding interfacial processes is crucial for designing efficient electrocatalysts.

Purpose of the Study:

To investigate interfacial processes on a palladium (Pd) monolayer deposited on a platinum (Pt)(111) single crystal electrode.
To elucidate the role of perchlorate anions in the electrochemical behavior of the Pd monolayer on Pt(111) surface.
To compare anion adsorption strength on Pd monolayer Pt(111) versus Pt(111) surfaces.

Main Methods:

Combined cyclic voltammetry and computational methods (Density Functional Theory).
Electrochemical investigation of a Pd monolayer on Pt(111) single crystal electrode in perchloric acid solution.
Analysis of interfacial processes, including hydrogen and hydroxyl adsorption/desorption.

Main Results:

Two distinct voltammetric peaks were observed in the 'hydrogen region' of the Pd monolayer Pt(111) surface.
The first peak involves hydrogen replacement by hydroxyl, while the second peak indicates hydroxyl replacement by perchlorate adsorption.
Anion adsorption on Pd monolayer Pt(111) is stronger than on Pt(111), with peak merging observed for strongly adsorbed anions like sulfate.

Conclusions:

Perchlorate anion specifically adsorbs on the Pd monolayer Pt(111) surface, influencing interfacial processes.
The observed voltammetric peaks are attributed to specific anion adsorption and surface hydroxyl species.
Computational results support the experimental findings, highlighting stronger anion binding on the Pd monolayer Pt(111) surface.