High‐Valence‐Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water Oxidation
Abstract Designing an efficient and durable electrocatalyst for the sluggish anodic oxygen evolution reaction (OER) has been the primary goal of using proton exchange membrane electrolyzer owing to the highly acidic and oxidative environment at the anode. In this work, it is reported that high‐valen...
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| Format: | Article |
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Wiley
2023-03-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202205920 |
| _version_ | 1797870165758574592 |
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| author | Yuxiao Weng Keyu Wang Shiyi Li Yixing Wang Linfeng Lei Linzhou Zhuang Zhi Xu |
| author_facet | Yuxiao Weng Keyu Wang Shiyi Li Yixing Wang Linfeng Lei Linzhou Zhuang Zhi Xu |
| author_sort | Yuxiao Weng |
| collection | DOAJ |
| description | Abstract Designing an efficient and durable electrocatalyst for the sluggish anodic oxygen evolution reaction (OER) has been the primary goal of using proton exchange membrane electrolyzer owing to the highly acidic and oxidative environment at the anode. In this work, it is reported that high‐valence manganese drives the strong anchoring of the Ir species on the manganese dioxide (MnO2) matrix via the formation of an Mn–O–Ir coordination structure through a hydrothermal‐redox reaction. The iridium (Ir)‐atom‐array array is firmly anchored on the Mn–O–Ir coordination structure, endowing the catalyst with excellent OER activity and stability in an acidic environment. Ir‐MnO2(160)‐CC shows an ultralow overpotential of 181 mV at j = 10 mA cm−2 and maintains long‐term stability of 180 h in acidic media with negligible decay, superior to most reported electrocatalysts. In contrast, when reacting with low‐valence MnO2, Ir species tend to aggregate into IrOx nanoparticles, leading to poor OER stability. Density functional theory (DFT) calculations further reveal that the formation of the Mn–O–Ir coordination structure can optimize the adsorption strength of *OOH intermediates, thus boosting the acidic OER activity and stability. |
| first_indexed | 2024-04-10T00:24:06Z |
| format | Article |
| id | doaj.art-4abc66f1172c459eba78026758a76888 |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-04-10T00:24:06Z |
| publishDate | 2023-03-01 |
| publisher | Wiley |
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| series | Advanced Science |
| spelling | doaj.art-4abc66f1172c459eba78026758a768882023-03-15T13:19:15ZengWileyAdvanced Science2198-38442023-03-01108n/an/a10.1002/advs.202205920High‐Valence‐Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water OxidationYuxiao Weng0Keyu Wang1Shiyi Li2Yixing Wang3Linfeng Lei4Linzhou Zhuang5Zhi Xu6State Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai 200237 ChinaState Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai 200237 ChinaState Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai 200237 ChinaState Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai 200237 ChinaState Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai 200237 ChinaState Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai 200237 ChinaState Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai 200237 ChinaAbstract Designing an efficient and durable electrocatalyst for the sluggish anodic oxygen evolution reaction (OER) has been the primary goal of using proton exchange membrane electrolyzer owing to the highly acidic and oxidative environment at the anode. In this work, it is reported that high‐valence manganese drives the strong anchoring of the Ir species on the manganese dioxide (MnO2) matrix via the formation of an Mn–O–Ir coordination structure through a hydrothermal‐redox reaction. The iridium (Ir)‐atom‐array array is firmly anchored on the Mn–O–Ir coordination structure, endowing the catalyst with excellent OER activity and stability in an acidic environment. Ir‐MnO2(160)‐CC shows an ultralow overpotential of 181 mV at j = 10 mA cm−2 and maintains long‐term stability of 180 h in acidic media with negligible decay, superior to most reported electrocatalysts. In contrast, when reacting with low‐valence MnO2, Ir species tend to aggregate into IrOx nanoparticles, leading to poor OER stability. Density functional theory (DFT) calculations further reveal that the formation of the Mn–O–Ir coordination structure can optimize the adsorption strength of *OOH intermediates, thus boosting the acidic OER activity and stability.https://doi.org/10.1002/advs.202205920acidic oxygen evolution reactionanchor siteshigh‐valence manganeseMn–O–Ir coordination |
| spellingShingle | Yuxiao Weng Keyu Wang Shiyi Li Yixing Wang Linfeng Lei Linzhou Zhuang Zhi Xu High‐Valence‐Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water Oxidation Advanced Science acidic oxygen evolution reaction anchor sites high‐valence manganese Mn–O–Ir coordination |
| title | High‐Valence‐Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water Oxidation |
| title_full | High‐Valence‐Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water Oxidation |
| title_fullStr | High‐Valence‐Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water Oxidation |
| title_full_unstemmed | High‐Valence‐Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water Oxidation |
| title_short | High‐Valence‐Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water Oxidation |
| title_sort | high valence manganese driven strong anchoring of iridium species for robust acidic water oxidation |
| topic | acidic oxygen evolution reaction anchor sites high‐valence manganese Mn–O–Ir coordination |
| url | https://doi.org/10.1002/advs.202205920 |
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