Enhancing the Activity and Stability of IrO2 for the Oxygen Evolution Reaction over a Wide pH Range using Electrodeposited BaO2
Abstract Electrochemical water splitting holds great promise for converting intermittent renewable energy into chemical energy in the form of hydrogen. A major challenge is developing highly active and stable electrocatalysts, in particular for the demanding oxygen evolution reaction (OER). IrO2 is...
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Wiley-VCH
2025-07-01
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| Series: | ChemElectroChem |
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| Online Access: | https://doi.org/10.1002/celc.202400611 |
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| author | Thi Hong Nga Ngo (Sarah Ngo) James D. Riches Jonathan Love Anthony P. O'Mullane |
| author_facet | Thi Hong Nga Ngo (Sarah Ngo) James D. Riches Jonathan Love Anthony P. O'Mullane |
| author_sort | Thi Hong Nga Ngo (Sarah Ngo) |
| collection | DOAJ |
| description | Abstract Electrochemical water splitting holds great promise for converting intermittent renewable energy into chemical energy in the form of hydrogen. A major challenge is developing highly active and stable electrocatalysts, in particular for the demanding oxygen evolution reaction (OER). IrO2 is renowned as one of the most efficient electrocatalysts for this reaction but still requires improvement in performance. Here we present an electrochemically synthesized IrO2/BaO2 electrocatalyst where the incorporation of BaO₂ is believed to elevate the oxygen activity within the composite, allowing it to sustain higher current densities with improved stability. In acidic media, the stability of the Ba‐IrO2‐300 °C sample showed significant improvement, with the initial current density of 100 mA cm−2 decreasing to 80 mA cm−2 after 8 h of testing. The resultant electrocatalysts show high catalytic activity over a wide range of pH values (1–14).At low current densities, neutral and alkaline conditions are more favourable compared to an acidic electrolyte where the stability at neutral pH was maintained for up to 70 h of testing. The enhanced performance of Ba‐incorporated IrO₂ may be attributed to access to oxygen activating Ba sites, offering valuable insights into the development of cost‐effective, efficient, and reliable IrO₂‐based catalysts for water splitting. |
| format | Article |
| id | doaj-art-1d7d549d8d494600a6b4859ab8bfe678 |
| institution | Kabale University |
| issn | 2196-0216 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wiley-VCH |
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| series | ChemElectroChem |
| spelling | doaj-art-1d7d549d8d494600a6b4859ab8bfe6782025-08-20T03:29:47ZengWiley-VCHChemElectroChem2196-02162025-07-011213n/an/a10.1002/celc.202400611Enhancing the Activity and Stability of IrO2 for the Oxygen Evolution Reaction over a Wide pH Range using Electrodeposited BaO2Thi Hong Nga Ngo (Sarah Ngo)0James D. Riches1Jonathan Love2Anthony P. O'Mullane3School of Chemistry and Physics Queensland University of Technology (QUT) 2 George St Brisbane QLD-4001, AustraliaCentre for Materials Science Queensland University of Technology (QUT) 2 George St Brisbane QLD-4001 AustraliaCentre for Hydrogen and Renewable Energy Central Queensland University, Gladstone Marina Campus 43 Bryan Jordan Drive Callemondah Qld-4680 AustraliaSchool of Chemistry and Physics Queensland University of Technology (QUT) 2 George St Brisbane QLD-4001, AustraliaAbstract Electrochemical water splitting holds great promise for converting intermittent renewable energy into chemical energy in the form of hydrogen. A major challenge is developing highly active and stable electrocatalysts, in particular for the demanding oxygen evolution reaction (OER). IrO2 is renowned as one of the most efficient electrocatalysts for this reaction but still requires improvement in performance. Here we present an electrochemically synthesized IrO2/BaO2 electrocatalyst where the incorporation of BaO₂ is believed to elevate the oxygen activity within the composite, allowing it to sustain higher current densities with improved stability. In acidic media, the stability of the Ba‐IrO2‐300 °C sample showed significant improvement, with the initial current density of 100 mA cm−2 decreasing to 80 mA cm−2 after 8 h of testing. The resultant electrocatalysts show high catalytic activity over a wide range of pH values (1–14).At low current densities, neutral and alkaline conditions are more favourable compared to an acidic electrolyte where the stability at neutral pH was maintained for up to 70 h of testing. The enhanced performance of Ba‐incorporated IrO₂ may be attributed to access to oxygen activating Ba sites, offering valuable insights into the development of cost‐effective, efficient, and reliable IrO₂‐based catalysts for water splitting.https://doi.org/10.1002/celc.202400611IrO2BaO2Oxygen evolution reactionElectrodepositionElectrocatalysisWater splitting |
| spellingShingle | Thi Hong Nga Ngo (Sarah Ngo) James D. Riches Jonathan Love Anthony P. O'Mullane Enhancing the Activity and Stability of IrO2 for the Oxygen Evolution Reaction over a Wide pH Range using Electrodeposited BaO2 ChemElectroChem IrO2 BaO2 Oxygen evolution reaction Electrodeposition Electrocatalysis Water splitting |
| title | Enhancing the Activity and Stability of IrO2 for the Oxygen Evolution Reaction over a Wide pH Range using Electrodeposited BaO2 |
| title_full | Enhancing the Activity and Stability of IrO2 for the Oxygen Evolution Reaction over a Wide pH Range using Electrodeposited BaO2 |
| title_fullStr | Enhancing the Activity and Stability of IrO2 for the Oxygen Evolution Reaction over a Wide pH Range using Electrodeposited BaO2 |
| title_full_unstemmed | Enhancing the Activity and Stability of IrO2 for the Oxygen Evolution Reaction over a Wide pH Range using Electrodeposited BaO2 |
| title_short | Enhancing the Activity and Stability of IrO2 for the Oxygen Evolution Reaction over a Wide pH Range using Electrodeposited BaO2 |
| title_sort | enhancing the activity and stability of iro2 for the oxygen evolution reaction over a wide ph range using electrodeposited bao2 |
| topic | IrO2 BaO2 Oxygen evolution reaction Electrodeposition Electrocatalysis Water splitting |
| url | https://doi.org/10.1002/celc.202400611 |
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