An electrochromic coordination nanosheet for robust CO2 photoreduction via ligand-based electron transfer

被引：0
作者：
Longxin Chen
Ting Liu
Duobin Chao
机构：
[1] Ningbo University,School of Materials Science and Chemical Engineering
来源：
Nano Research | 2022年 / 15卷
关键词：
photocatalysis; CO; reduction; electron transfer; coordination nanosheet; electrochromism;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A coordination nanosheet composed of [Fe(tpy)2]2+ (tpy = 2,2′:6′,2″-terpyridine) units, showing reversible electrochromism at the ligand-based cathodic potential, has been prepared through a liquid/liquid interfacial synthesis. The noble metal-free nanosheet exhibited a CO evolution rate of 114.3 mmol·g−1·h−1 with the selectivity up to 99.3% under visible light irradiation in the presence of water, which is in the front rank of heterogeneous catalysis for CO2 photoreduction. Such robust photocatalytic performance is due to efficient ligand-based electron transfer through long-lived π radical anion tpy− with a lifetime more than 25 min, as evidenced by in situ electron paramagnetic resonance (EPR) and ultraviolet—visible—near infrared (UV—vis—NIR) spectroscopy studies. Fe(II) cation in [Fe(tpy)2]2+ mainly contributes to enhancing reduction potentials of ligand and stabilizing π radical anion tpy−. This ligand-based electron transfer with the aid of metal cation represents a promising strategy for selective CO2 photoreduction, especially towards gaining CO from CO2.
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页码：5902 / 5911
页数：9
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