1. Dynamic chloride ion adsorption on single iridium atom boosts seawater oxidation catalysis.
- Author
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Duan, Xinxuan, Sha, Qihao, Li, Pengsong, Li, Tianshui, Yang, Guotao, Liu, Wei, Yu, Ende, Zhou, Daojin, Fang, Jinjie, Chen, Wenxing, Chen, Yizhen, Zheng, Lirong, Liao, Jiangwen, Wang, Zeyu, Li, Yaping, Yang, Hongbin, Zhang, Guoxin, Zhuang, Zhongbin, Hung, Sung-Fu, and Jing, Changfei
- Subjects
CHLORIDE ions ,SEAWATER ,OXYGEN evolution reactions ,GREEN fuels ,ADSORPTION (Chemistry) ,IRIDIUM - Abstract
Seawater electrolysis offers a renewable, scalable, and economic means for green hydrogen production. However, anode corrosion by Cl
- pose great challenges for its commercialization. Herein, different from conventional catalysts designed to repel Cl- adsorption, we develop an atomic Ir catalyst on cobalt iron layered double hydroxide (Ir/CoFe-LDH) to tailor Cl- adsorption and modulate the electronic structure of the Ir active center, thereby establishing a unique Ir-OH/Cl coordination for alkaline seawater electrolysis. Operando characterizations and theoretical calculations unveil the pivotal role of this coordination state to lower OER activation energy by a factor of 1.93. The Ir/CoFe-LDH exhibits a remarkable oxygen evolution reaction activity (202 mV overpotential and TOF = 7.46 O2 s−1 ) in 6 M NaOH+2.8 M NaCl, superior over Cl- -free 6 M NaOH electrolyte (236 mV overpotential and TOF = 1.05 O2 s−1 ), with 100% catalytic selectivity and stability at high current densities (400-800 mA cm−2 ) for more than 1,000 h. The seawater oxidation reaction faces challenges from competitive chloride oxidation reaction. Herein, the authors have utilized chlorine adsorption to modulate the single-atom Ir coordination state and promote seawater oxidation and catalyst stability. [ABSTRACT FROM AUTHOR]- Published
- 2024
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