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Advanced Science

Advanced Science

IF: 14.3
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High Catalytic Selectivity of Electron/Proton Dual‐Conductive Sulfonated Polyaniline Micropore Encased IrO2 Electrocatalyst by Screening Effect for Oxygen?…

Published:4 December 2024 DOI: 10.1002/advs.202412862 PMID: 39630053
Yuhan Shen,?Shengqiu Zhao,?Fanglin Wu,?Hao Zhang,?Liyan Zhu,?Mingjuan Wu,?Tian Tian,?Haolin Tang

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.

Substances (9)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Sodium chloride 7647-14-5 ClNa 1215 suppliers $5.00-$6678.62
Calcium chloride 10043-52-4 CaCl2 940 suppliers $5.00-$26371.00
Ethanol 64-17-5 C2H6O 806 suppliers $10.00-$17310.00
Magnesium chloride 7786-30-3 Cl2Mg 564 suppliers $19.32-$6748.59
1,3,5-Tribromobenzene 626-39-1 C6H3Br3 556 suppliers $5.00-$769.05
Ferric chloride 7705-08-0 Cl3Fe 494 suppliers $9.00-$2361.40
4-(Diphenylamino)phenylboronic acid 201802-67-7 C18H16BNO2 296 suppliers $6.00-$8177.40
Dichloroethane 1300-21-6 C2H4Cl2 265 suppliers Inquiry
PETROLEUM ETHER 64742-89-8 36 suppliers $78.30-$6590.00

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