双金属
层状双氢氧化物
单宁酸
材料科学
螯合作用
光催化
金属
水溶液中的金属离子
无机化学
催化作用
儿茶酚
蚀刻(微加工)
光化学
化学工程
纳米技术
化学
氢氧化物
冶金
有机化学
图层(电子)
工程类
作者
He Cui,Xiaoqian Wu,Shun‐Li Li,Jiabo Wang,Ruoxue Wang,Yi Zhao,Kai Ge,Yidong Hu,Boxiong Shen,Yongfang Yang
出处
期刊:Small
[Wiley]
日期:2024-10-17
标识
DOI:10.1002/smll.202407221
摘要
Abstract Recently, layered double hydroxides (LDH) have shown great potential in photoreduction of CO 2 owing to its flexible structural adjustability. In this study, the mild acidic property of tannic acid (TA) is exploited to etch the bimetal LDH to create abundant vacancies to gain the coordination unsaturated active centers. Based on the different chelating abilities of TA to various metal ions, the active metals are remained by selective chelation while the inert metals are removed during the etching process of bimetal LDH. Furthermore, selective chelating with metal ions not only increases the percentage of highly active metals but also compensates for the structural damage caused by the etch, which achieves a scalpel‐like selective construction of vacancies. The NiAl‐LDH etched and functionalized by TA for 3 h exhibits superior photo‐reduction of CO 2 performance without co‐catalysts and photo‐sensitizers, which is 14 times that of the pristine NiAl‐LDH. The fact that many bimetal LDHs can be functionalized by TA and exhibit significantly improved photocatalytic efficiency is confirmed, suggesting this strategy is generalized to functionalize double‐ or multi‐metal LDH. The method provided in this work opens the door for polyphenol‐functionalized LDHs to enhance their ability for light‐driven chemical transformations.
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