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/IrO 2 ) is developed by coating iridium oxide (IrO 2 ) with a microporous conjugated organic framework functionalized with sulfonate groups (-SO 3 H) to tackle these challenges. The SPTTPAB/IrO 2 presents a -SO 3 H concentration of 5.62 × 10 −4 mol g −1 and micropore below 2 nm numbering 1.026 × 10 16 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 -SO 3 H, 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 IrO 2 , respectively. Impressively, SPTTPAB/IrO 2 exhibits outstanding seawater electrolysis performance, with a 35.3% improvement over IrO 2 to 69 mA cm −2 @1.9 V, while the degradation rate (0.018 mA h −1 ) is only 24.6% of IrO 2 . This study offers an innovative solution for designing high-performance seawater electrolysis electrocatalysts.
Sun Juan,Zhang Zonghuai,Gong Yansheng,Wang Huanwen,Wang Rui,Zhao Ling,He Beibei
The development of highly active and cost-effective catalysts based on noble metal free oxygen electro-catalysis is critical to energy storage and conversion devices. Herein, we highlight a plasma-treated Bi 0.1 (Ba 0.5 Sr 0.5 ) 0.9 Co 0.8 Fe 0.2 O 3−δ perovskite (denoted as P-Bi 0.1 BSCF) as a promising catalyst for oxygen evolution reaction (OER) in alkaline media. H 2 /Ar plasma engraving could significantly increase electrochemically active O 2 2− /O − concentration and tune the electronic structure of Co ions efficiently, and consequently tailor the intrinsic electrocatalytic ability for OER. Of note, P-Bi 0.1 BSCF, with unique crystalline core/amorphous shell structure, exhibits an enhanced intrinsic OER activity and higher stability than the noble metal IrO 2 catalyst, which outperforms most of the reported perovskite catalysts. The present work provides new insights into exploring efficient catalysts for OER, and it suggests that, in addition to the extensively applied for surface treatment of various catalysts such as carbons and metal oxides, the plasma engraved perovskite materials also exhibits great potential as precious metal-free catalysts.
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