Deeply understanding electrocatalytic oxygen evolution reaction from the perspective of defect structures

Wang, Huan; Fan, Wenlin; Yang, Shiduo; Gong, Guannan; Chen, Sen; Jiao, Lishi; You, Feifei; Qi, Jian

doi:10.1016/j.cej.2024.156124

Chemical Engineering Journal

2024

DOI: 10.1016/j.cej.2024.156124

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Deeply understanding electrocatalytic oxygen evolution reaction from the perspective of defect structures

Huan Wang,

Wenlin Fan,

Shiduo Yang

et al.

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2024

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High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO₂ Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis

Shen,

Zhao,

et al. 2024

Advanced Science

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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.

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High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO₂ Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis

Shen,

Zhao,

et al. 2024

Advanced Science

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Deeply understanding electrocatalytic oxygen evolution reaction from the perspective of defect structures

Cited by 1 publication

References 117 publications

High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO₂ Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis

High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO₂ Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis

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Deeply understanding electrocatalytic oxygen evolution reaction from the perspective of defect structures

Cited by 1 publication

References 117 publications

High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis

High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis

Contact Info

Product

Resources

About

High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO₂ Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis

High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO₂ Electrocatalyst by Screening Effect for Oxygen Evolution of Seawater Electrolysis