催化作用
析氧
电解质
材料科学
磁场
氧气
分解水
离子
无机化学
电极
化学工程
化学
电化学
物理化学
物理
有机化学
工程类
生物化学
量子力学
光催化
作者
Minghui Xie,Haotian Wang,Xianjun Li,Guojun Han,Yongqiang Yang,Xinyue Shi,Shi‐Yi Lin,Guo‐Xing Miao,Meng‐Hao Yang,Jing Fu
出处
期刊:Small
[Wiley]
日期:2024-09-09
标识
DOI:10.1002/smll.202405946
摘要
Abstract Under large current densities, the excessive hydroxide ion (OH) consumption hampers alkaline water splitting involving the oxygen evolution reaction (OER). High OH concentration (≈30 wt.%) is often used to enhance the catalytic activity of OER, but it also leads to higher corrosion in practical systems. To achieve higher catalytic activity in low OH concentration, catalysts on magnetic frame (CMF) are built to utilize the local magnetic convection induced from the host frame's magnetic field distributions. This way, a higher reaction rate can be achieved in relatively lower OH concentrations. A CMF model system with catalytically active CoFeO x nanograins grown on the magnetic Ni foam is demonstrated. The OER current of CoFeO x @NF receives ≈90% enhancement under 400 mT (900 mA cm −2 at 1.65 V) compared to that in zero field, and exhibits remarkable durability over 120 h. As a demonstration, the water‐splitting performance sees a maximum 45% magnetic enhancement under 400 mT in 1 m KOH (700 mA cm −2 at 2.4 V), equivalent to the concentration enhancement of the same electrode in a more corrosive 2 m KOH electrolyte. Therefore, the catalyst‐on‐magnetic‐frame strategy can make efficient use of the catalysts and achieve higher catalytic activity in low OH concentration by harvesting local magnetic convection.
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