Related Experiment Video
Updated: Apr 19, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Using cavity microelectrodes for electrochemical noise studies of oxygen-evolving catalysts
Rosalba A Rincón1, Alberto Battistel, Edgar Ventosa
1Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum (Germany).
Abstract:
Cavity microelectrodes were used as a binder-free platform to evaluate oxygen evolution reaction (OER) electrocatalysts with respect to gas bubble formation and departure. Electrochemical noise measurements were performed by using RuO2 as a benchmark catalyst and the perovskite La0.58 Sr0.4 Fe0.8 Co0.2 O3 as a non-noble metal OER catalyst with lower intrinsic conductivity. Changes in the current during the OER originate from variations in electrolyte resistance during the formation of the gas phase and partial coverage of the active area. Fluctuations observed in current and conductance transients were used to establish the contribution from the ohmic overpotential and to determine the characteristic frequency of oxygen evolution. The proposed quantitative determination of gas bubble growth and departure opens up the route for a rational interface design by considering gas bubble growth and departure as a main contributing factor to the overall electrocatalytic activity at high current densities.
Related Concept Videos
Electrochemical Cells
Electrochemical Systems
Controlled-Potential Coulometry: Electrolytic Methods
The chosen potential...
Potentiometry: Membrane Electrodes
Standard Electrode Potentials
Voltammetry: Factors Affecting Measurements

