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Related Concept Videos

Processes at Electrodes01:30

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
Voltammetry: Factors Affecting Measurements01:21

Voltammetry: Factors Affecting Measurements

A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
Electrolysis03:00

Electrolysis

In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Related Experiment Video

Updated: Jun 25, 2026

Precise Electrochemical Sizing of Individual Electro-Inactive Particles
05:03

Precise Electrochemical Sizing of Individual Electro-Inactive Particles

Published on: August 4, 2023

Mesoscopic mass transport effects in electrocatalytic processes.

Y E Seidel1, A Schneider, Z Jusys

  • 1Institute of Surface Chemistry and Catalysis, Ulm University, Ulm D-89069, Germany.

Faraday Discussions
|February 14, 2009
PubMed
Summary

This study reveals how mass transport and re-adsorption affect electrocatalytic reactions like oxygen reduction. Increasing electrolyte flow significantly boosts hydrogen peroxide yield on platinum nanodisks.

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Nanotechnology

Background:

  • Electrocatalytic reactions are crucial for energy conversion.
  • Understanding mass transport and re-adsorption is key to optimizing catalyst performance.
  • Oxygen reduction reaction (ORR) selectivity is influenced by reaction conditions.

Purpose of the Study:

  • To investigate the role of mesoscopic mass transport and re-adsorption in electrocatalytic reactions.
  • To examine the oxygen reduction reaction (ORR) using well-defined nanostructured electrodes.
  • To quantify the impact of electrolyte flow rate on ORR selectivity and hydrogen peroxide yield.

Main Methods:

  • Electrochemical measurements using structurally well-defined nanostructured model electrodes.
  • Fabrication of platinum (Pt) ultra-microelectrodes (nanodisks) on glassy carbon (GC) via hole-mask colloidal lithography (HCL).
  • Controlled transport conditions in a thin-layer flow cell.

Main Results:

  • ORR selectivity varied with Pt nanodisk density and electrolyte flow.
  • Hydrogen peroxide yield increased by up to 65% with increasing flow rate (1 to 30 µL s⁻¹).
  • Results align with a model incorporating direct reduction to water and H2O2 formation/re-adsorption.

Conclusions:

  • Mesoscopic mass transport and re-adsorption significantly influence electrocatalytic reaction pathways.
  • Model studies on defined surfaces under controlled conditions are valuable for understanding complex reactions.
  • Optimizing flow conditions can enhance desired product selectivity in electrocatalysis.