High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis
Abstract Acidic seawater electrolysis offers significant advantages in high efficiency and sustainable hydrogen production. However, in situ electrolysis of acidic seawater remains a challenge. Herein, a stable and efficient catalyst (SPTTPAB/IrO2) is developed by coating iridium oxide (IrO2) with a...
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Wiley
2025-01-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202412862 |
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| author | Yuhan Shen Shengqiu Zhao Fanglin Wu Hao Zhang Liyan Zhu Mingjuan Wu Tian Tian Haolin Tang |
| author_facet | Yuhan Shen Shengqiu Zhao Fanglin Wu Hao Zhang Liyan Zhu Mingjuan Wu Tian Tian Haolin Tang |
| author_sort | Yuhan Shen |
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| description | Abstract Acidic seawater electrolysis offers significant advantages in high efficiency and sustainable hydrogen production. However, in situ electrolysis of acidic seawater remains a challenge. Herein, a stable and efficient catalyst (SPTTPAB/IrO2) is developed by coating iridium oxide (IrO2) with a microporous conjugated organic framework functionalized with sulfonate groups (‐SO3H) to tackle these challenges. The SPTTPAB/IrO2 presents a ‐SO3H concentration of 5.62 × 10−4 mol g−1 and micropore below 2 nm numbering 1.026 × 1016 g−1. Molecular dynamics simulations demonstrate that the conjugated organic framework blocked 98.62% of Cl− in seawater from reaching the catalyst. This structure combines electron conductivity from the organic framework and proton conductivity from ‐SO3H, weakens the Cl− adsorption, and suppresses metal‐chlorine coupling, thus enhancing the catalytic activity and selectivity. As a result, the overpotential for the oxygen evolution reaction (OER) is only 283 mV@10 mA cm−2, with a Tafel slope of 16.33 mV dec−1, which reduces 13.8% and 37.8% compared to commercial IrO2, respectively. Impressively, SPTTPAB/IrO2 exhibits outstanding seawater electrolysis performance, with a 35.3% improvement over IrO2 to 69 mA cm−2@1.9 V, while the degradation rate (0.018 mA h−1) is only 24.6% of IrO2. This study offers an innovative solution for designing high‐performance seawater electrolysis electrocatalysts. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-5a5f0ec11e544706ab7010bb58c5b56e2025-01-29T09:50:19ZengWileyAdvanced Science2198-38442025-01-01124n/an/a10.1002/advs.202412862High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater ElectrolysisYuhan Shen0Shengqiu Zhao1Fanglin Wu2Hao Zhang3Liyan Zhu4Mingjuan Wu5Tian Tian6Haolin Tang7State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. ChinaState Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. ChinaState Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. ChinaState Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. ChinaState Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. ChinaState Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. ChinaState Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. ChinaState Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. ChinaAbstract Acidic seawater electrolysis offers significant advantages in high efficiency and sustainable hydrogen production. However, in situ electrolysis of acidic seawater remains a challenge. Herein, a stable and efficient catalyst (SPTTPAB/IrO2) is developed by coating iridium oxide (IrO2) with a microporous conjugated organic framework functionalized with sulfonate groups (‐SO3H) to tackle these challenges. The SPTTPAB/IrO2 presents a ‐SO3H concentration of 5.62 × 10−4 mol g−1 and micropore below 2 nm numbering 1.026 × 1016 g−1. Molecular dynamics simulations demonstrate that the conjugated organic framework blocked 98.62% of Cl− in seawater from reaching the catalyst. This structure combines electron conductivity from the organic framework and proton conductivity from ‐SO3H, weakens the Cl− adsorption, and suppresses metal‐chlorine coupling, thus enhancing the catalytic activity and selectivity. As a result, the overpotential for the oxygen evolution reaction (OER) is only 283 mV@10 mA cm−2, with a Tafel slope of 16.33 mV dec−1, which reduces 13.8% and 37.8% compared to commercial IrO2, respectively. Impressively, SPTTPAB/IrO2 exhibits outstanding seawater electrolysis performance, with a 35.3% improvement over IrO2 to 69 mA cm−2@1.9 V, while the degradation rate (0.018 mA h−1) is only 24.6% of IrO2. This study offers an innovative solution for designing high‐performance seawater electrolysis electrocatalysts.https://doi.org/10.1002/advs.202412862catalytic selectivityconjugate organic frameworkIrO2seawater electrolysissulfonate |
| spellingShingle | Yuhan Shen Shengqiu Zhao Fanglin Wu Hao Zhang Liyan Zhu Mingjuan Wu Tian Tian Haolin Tang High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis Advanced Science catalytic selectivity conjugate organic framework IrO2 seawater electrolysis sulfonate |
| title | High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis |
| title_full | High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis |
| title_fullStr | High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis |
| title_full_unstemmed | High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis |
| title_short | High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis |
| title_sort | high catalytic selectivity of electron proton dual conductive sulfonated polyaniline micropore encased iro2 electrocatalyst by screening effect for oxygen evolution of seawater electrolysis |
| topic | catalytic selectivity conjugate organic framework IrO2 seawater electrolysis sulfonate |
| url | https://doi.org/10.1002/advs.202412862 |
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