Rapid Scan Cyclic Voltammetry (RSCV) investigation of oxygen reduction reaction (ORR) on gold ultramicroelectrode (UME): a novel methodology to study kinetics of formation of transient intermediates
Abstract This study employs Rapid Scan Cyclic Voltammetry (RSCV) with a gold ultramicroelectrode (Au UME) to investigate transient species in the oxygen reduction reaction (ORR) under alkaline conditions. Gold was purposefully chosen as the electrode material due to its ability to generate peroxide...
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| Format: | Article |
| Language: | English |
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Springer
2025-05-01
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| Series: | Discover Electrochemistry |
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| Online Access: | https://doi.org/10.1007/s44373-025-00034-w |
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| author | Sharon Benny Alex Linsha Vazhayal Santosh K. Haram |
| author_facet | Sharon Benny Alex Linsha Vazhayal Santosh K. Haram |
| author_sort | Sharon Benny Alex |
| collection | DOAJ |
| description | Abstract This study employs Rapid Scan Cyclic Voltammetry (RSCV) with a gold ultramicroelectrode (Au UME) to investigate transient species in the oxygen reduction reaction (ORR) under alkaline conditions. Gold was purposefully chosen as the electrode material due to its ability to generate peroxide radicals via a two-electron transfer mechanism. RSCV on Au UME shows cathodic peaks, C1 and C2, linked to the sequential reduction of oxygen to peroxide anion and then to hydroxyl anion, and along with an anodic peak, A1, corresponding to peroxide anion oxidation back to oxygen. Quantitative analysis of these peaks, performed by integrating the peak areas, enabled rate determination for the formation of transient species. Thermodynamic and kinetic analyses further show a preference for decomposition over reduction, attributed to lower activation energy requirements. These findings demonstrate RSCV-UME’s effectiveness for real-time ORR intermediate detection and highlight how scan rate adjustments can alter reaction pathways, offering a powerful approach for exploring electrochemical mechanisms relevant to electrocatalysis and energy conversion technologies. |
| format | Article |
| id | doaj-art-a465ee7f3a66421abf5f2c3e9e2d0e46 |
| institution | DOAJ |
| issn | 3005-1215 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Springer |
| record_format | Article |
| series | Discover Electrochemistry |
| spelling | doaj-art-a465ee7f3a66421abf5f2c3e9e2d0e462025-08-20T03:16:34ZengSpringerDiscover Electrochemistry3005-12152025-05-01211810.1007/s44373-025-00034-wRapid Scan Cyclic Voltammetry (RSCV) investigation of oxygen reduction reaction (ORR) on gold ultramicroelectrode (UME): a novel methodology to study kinetics of formation of transient intermediatesSharon Benny Alex0Linsha Vazhayal1Santosh K. Haram2Department of Chemistry, Savitribai Phule Pune UniversityDepartment of Chemistry, Savitribai Phule Pune UniversityDepartment of Chemistry, Savitribai Phule Pune UniversityAbstract This study employs Rapid Scan Cyclic Voltammetry (RSCV) with a gold ultramicroelectrode (Au UME) to investigate transient species in the oxygen reduction reaction (ORR) under alkaline conditions. Gold was purposefully chosen as the electrode material due to its ability to generate peroxide radicals via a two-electron transfer mechanism. RSCV on Au UME shows cathodic peaks, C1 and C2, linked to the sequential reduction of oxygen to peroxide anion and then to hydroxyl anion, and along with an anodic peak, A1, corresponding to peroxide anion oxidation back to oxygen. Quantitative analysis of these peaks, performed by integrating the peak areas, enabled rate determination for the formation of transient species. Thermodynamic and kinetic analyses further show a preference for decomposition over reduction, attributed to lower activation energy requirements. These findings demonstrate RSCV-UME’s effectiveness for real-time ORR intermediate detection and highlight how scan rate adjustments can alter reaction pathways, offering a powerful approach for exploring electrochemical mechanisms relevant to electrocatalysis and energy conversion technologies.https://doi.org/10.1007/s44373-025-00034-wOxygen reduction reactionUltramicroelectrodeRapid scan cyclic voltammetryHydrogen peroxide |
| spellingShingle | Sharon Benny Alex Linsha Vazhayal Santosh K. Haram Rapid Scan Cyclic Voltammetry (RSCV) investigation of oxygen reduction reaction (ORR) on gold ultramicroelectrode (UME): a novel methodology to study kinetics of formation of transient intermediates Discover Electrochemistry Oxygen reduction reaction Ultramicroelectrode Rapid scan cyclic voltammetry Hydrogen peroxide |
| title | Rapid Scan Cyclic Voltammetry (RSCV) investigation of oxygen reduction reaction (ORR) on gold ultramicroelectrode (UME): a novel methodology to study kinetics of formation of transient intermediates |
| title_full | Rapid Scan Cyclic Voltammetry (RSCV) investigation of oxygen reduction reaction (ORR) on gold ultramicroelectrode (UME): a novel methodology to study kinetics of formation of transient intermediates |
| title_fullStr | Rapid Scan Cyclic Voltammetry (RSCV) investigation of oxygen reduction reaction (ORR) on gold ultramicroelectrode (UME): a novel methodology to study kinetics of formation of transient intermediates |
| title_full_unstemmed | Rapid Scan Cyclic Voltammetry (RSCV) investigation of oxygen reduction reaction (ORR) on gold ultramicroelectrode (UME): a novel methodology to study kinetics of formation of transient intermediates |
| title_short | Rapid Scan Cyclic Voltammetry (RSCV) investigation of oxygen reduction reaction (ORR) on gold ultramicroelectrode (UME): a novel methodology to study kinetics of formation of transient intermediates |
| title_sort | rapid scan cyclic voltammetry rscv investigation of oxygen reduction reaction orr on gold ultramicroelectrode ume a novel methodology to study kinetics of formation of transient intermediates |
| topic | Oxygen reduction reaction Ultramicroelectrode Rapid scan cyclic voltammetry Hydrogen peroxide |
| url | https://doi.org/10.1007/s44373-025-00034-w |
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