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Evaluation of the Catalytic Performance of Gas‐Evolving Electrodes using Local Electrochemical Noise Measurements
Author(s) -
Zeradjanin Aleksandar R.,
Ventosa Edgar,
Bondarenko Alexander S.,
Schuhmann Wolfgang
Publication year - 2012
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201200262
Subject(s) - electrochemical noise , electrochemistry , electrode , catalysis , noise (video) , materials science , nanotechnology , chemistry , computer science , organic chemistry , artificial intelligence , image (mathematics)
Characterization of gas evolution reactions at the electrode/electrolyte boundary is often difficult due to the dynamic behavior of interfacial processes. Electrochemical noise measurements determined by scanning electrochemical microscopy were used to characterize Cl 2 evolution at gas‐evolving electrodes (GEEs). Analysis of the electrochemical noise is a powerful method to evaluate the efficiency of the catalyst layer at a GEE. The high sensitivity of the developed measurement system enabled accurate monitoring of the current fluctuations caused by gas‐bubble detachment from the electrode surface. Fourier transform analysis of the obtained current responses allows extraction of the characteristic frequency, which is the main parameter of the macrokinetics of GEEs. The characteristic frequency was used as part of a methodology to evaluate the catalyst performance and, in particular, to estimate the fraction of the catalyst layer that is active during the gas evolution reaction.