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Autori principali:	Bodappa, Nataraju, Jerkiewicz, Gregory, Grutter, Peter
Natura:	Preprint
Pubblicazione:	2025
Soggetti:	Mesoscale and Nanoscale Physics
Accesso online:	https://arxiv.org/abs/2511.12067
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author	Bodappa, Nataraju Jerkiewicz, Gregory Grutter, Peter
author_facet	Bodappa, Nataraju Jerkiewicz, Gregory Grutter, Peter
contents	Understanding O2 bubble nucleation and growth during the oxygen evolution reaction (OER) is crucial to comprehend their influences on catalytically active sites in the process. To achieve this goal, mapping the spatial variation of nanoscale dynamic individual steps at the electrocatalytic interfaces is vital, as it further enables a detailed understanding of the mechanism of the process. Here, we combined tapping mode AFM imaging with a Pt ultramicroelectrode to investigate oxygen bubble nucleation, growth, and detachment. Our AFM feedback error signal and topography data reveal that bubbles of O2 gas nucleate at the step edge sites and interact with the catalytically active sites. This interaction between primary catalytic sites and bubble nucleation sites is the primary reason for a decrease in the current density at a given high overpotential of the OER. Our findings advance the understanding of the complexity of phenomena involved in gas evolution on catalytic surfaces.
format	Preprint
id	arxiv_https___arxiv_org_abs_2511_12067
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Probing Electrocatalytic Gas Evolution Reaction at Pt by Force Noise Measurements. Part 2. Oxygen Bodappa, Nataraju Jerkiewicz, Gregory Grutter, Peter Mesoscale and Nanoscale Physics Understanding O2 bubble nucleation and growth during the oxygen evolution reaction (OER) is crucial to comprehend their influences on catalytically active sites in the process. To achieve this goal, mapping the spatial variation of nanoscale dynamic individual steps at the electrocatalytic interfaces is vital, as it further enables a detailed understanding of the mechanism of the process. Here, we combined tapping mode AFM imaging with a Pt ultramicroelectrode to investigate oxygen bubble nucleation, growth, and detachment. Our AFM feedback error signal and topography data reveal that bubbles of O2 gas nucleate at the step edge sites and interact with the catalytically active sites. This interaction between primary catalytic sites and bubble nucleation sites is the primary reason for a decrease in the current density at a given high overpotential of the OER. Our findings advance the understanding of the complexity of phenomena involved in gas evolution on catalytic surfaces.
title	Probing Electrocatalytic Gas Evolution Reaction at Pt by Force Noise Measurements. Part 2. Oxygen
topic	Mesoscale and Nanoscale Physics
url	https://arxiv.org/abs/2511.12067

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