Experimental and theoretical studies of WO3-Vulcan XC-72 electrocatalyst enhanced H2O2 yield ORR performed in acid and alkaline medium
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912382981242880 |
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| author | Moura, João Paulo C Lucchetti, Lanna EB Fernandes, Caio M Trench, Aline B Lange, Camila N Batista, Bruno L Almeida, James M Santos, Mauro C |
| author_facet | Moura, João Paulo C Lucchetti, Lanna EB Fernandes, Caio M Trench, Aline B Lange, Camila N Batista, Bruno L Almeida, James M Santos, Mauro C |
| contents | The oxygen reduction reaction (ORR) plays a pivotal role in clean energy generation and sustainable chemical production, particularly in the synthesis of hydrogen peroxide (H\textsubscript{2}O\textsubscript{2}). In this study, WO\textsubscript{3}/Vulcan-XC72 electrocatalysts were synthesized and characterized for ORR applications, evaluating the WO\textsubscript{3} to Vulcan-XC72 ratio and examining electrolyte pH effects across acidic and alkaline media. Structural characterization confirmed successful synthesis of monoclinic WO\textsubscript{3} with nanoflower morphology, which enhanced surface hydrophilicity and oxygen functional groups. Electrochemical tests demonstrated WO\textsubscript{3}/C's superior H\textsubscript{2}O\textsubscript{2} selectivity compared to pure Vulcan-XC72 in both media, revealing a pH-dependent ORR mechanism. Using WO\textsubscript{3}/C gas diffusion electrodes (GDEs), we achieved 862,mg,L\textsuperscript{-1} H\textsubscript{2}O\textsubscript{2} accumulation after 120,min at 100,mA,cm\textsuperscript{-2}. The enhanced performance stems from increased oxygen functional groups, improved hydrophilicity, and WO\textsubscript{3} nanoflower synergistic effects, as supported by theoretical calculations, establishing WO\textsubscript{3}/Vulcan as a promising catalyst for electrochemical H\textsubscript{2}O\textsubscript{2} production. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_13800 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Experimental and theoretical studies of WO3-Vulcan XC-72 electrocatalyst enhanced H2O2 yield ORR performed in acid and alkaline medium Moura, João Paulo C Lucchetti, Lanna EB Fernandes, Caio M Trench, Aline B Lange, Camila N Batista, Bruno L Almeida, James M Santos, Mauro C Materials Science Mesoscale and Nanoscale Physics The oxygen reduction reaction (ORR) plays a pivotal role in clean energy generation and sustainable chemical production, particularly in the synthesis of hydrogen peroxide (H\textsubscript{2}O\textsubscript{2}). In this study, WO\textsubscript{3}/Vulcan-XC72 electrocatalysts were synthesized and characterized for ORR applications, evaluating the WO\textsubscript{3} to Vulcan-XC72 ratio and examining electrolyte pH effects across acidic and alkaline media. Structural characterization confirmed successful synthesis of monoclinic WO\textsubscript{3} with nanoflower morphology, which enhanced surface hydrophilicity and oxygen functional groups. Electrochemical tests demonstrated WO\textsubscript{3}/C's superior H\textsubscript{2}O\textsubscript{2} selectivity compared to pure Vulcan-XC72 in both media, revealing a pH-dependent ORR mechanism. Using WO\textsubscript{3}/C gas diffusion electrodes (GDEs), we achieved 862,mg,L\textsuperscript{-1} H\textsubscript{2}O\textsubscript{2} accumulation after 120,min at 100,mA,cm\textsuperscript{-2}. The enhanced performance stems from increased oxygen functional groups, improved hydrophilicity, and WO\textsubscript{3} nanoflower synergistic effects, as supported by theoretical calculations, establishing WO\textsubscript{3}/Vulcan as a promising catalyst for electrochemical H\textsubscript{2}O\textsubscript{2} production. |
| title | Experimental and theoretical studies of WO3-Vulcan XC-72 electrocatalyst enhanced H2O2 yield ORR performed in acid and alkaline medium |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.13800 |