Mimic metalloenzymes with atomically dispersed Fe sites in covalent organic framework membranes for enhanced CO2 photoreduction†

IF 7.6 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Shuaiqi Gao, Xiao Zhao, Qian Zhang, Linlin Guo, Zhiyong Li, Huiyong Wang, Suojiang Zhang and Jianji Wang
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Abstract

The massive CO2 emissions from continuous increases in fossil fuel consumption have caused disastrous environmental and ecological crises. Covalent organic frameworks (COFs) hold the potential to convert CO2 and water into value-added chemicals and O2 to mitigate this crisis. However, their activity and selectivity are very low under conditions close to natural photosynthesis. In this work, inspired by the photosynthesis process in natural leaves, we successfully anchored atomically dispersed Fe sites into interlayers of the photoactive triazine-based COF (Fe–COF) membrane to serve as a mimic metalloenzyme for the first time. It is found that under gas–solid conditions and no addition of any photosensitizer and sacrificial reagent, the highly crystalline Fe–COF membrane shows a record high CO2 photoreduction performance with a CO production of 3972 μmol g−1 in a 4 h reaction, ∼100% selectivity of CO, and excellent cycling stability (at least 10 cycles). In such a remarkable photocatalytic CO2 conversion, the atomically dispersed Fe sites with high catalytic activity significantly reduce the formation energy barrier of key *CO2 and *COOH intermediates, the high-density triazine moieties supply more electrons to the iron catalytic center to promote CO2 reduction, and the homogeneous COF membrane greatly improves the electron/mass transport. Thus, this work opens a new window for the design of highly efficient photocatalysts and provides new insights into their structure–activity relationship in CO2 photocatalytic reduction.

Abstract Image

具有原子分散铁位点的模拟金属酶进入共价有机框架膜以增强CO2光还原
化石燃料消费的持续增长造成了大量的二氧化碳排放,造成了灾难性的环境和生态危机。共价有机框架(COFs)具有将二氧化碳和水转化为增值化学品和O2的潜力,以缓解这一危机。然而,在接近自然光合作用的条件下,它们的活性和选择性非常低。在这项工作中,受天然叶片光合作用过程的启发,我们成功地将原子分散的铁位点锚定在光活性三嗪基COF (Fe-COF)膜的中间层中,首次作为模拟金属酶。结果表明,在不添加任何光敏剂和牺牲剂的条件下,高结晶Fe-COF膜具有优异的CO2光还原性能,反应4 h CO产量为3972 μmol g-1, CO选择性为100%,循环稳定性好(至少10次循环)。在这一显著的光催化CO2转化过程中,原子分散的具有高催化活性的Fe位点显著降低了关键的*CO2和*COOH中间体的形成能垒,高密度的三氮嘧啶基团向铁催化中心提供了更多的电子,促进了CO2的还原,均匀的COF膜极大地提高了电子/质量传递。因此,本研究为高效光催化剂的设计打开了一扇新的窗口,并为其在CO2光催化还原中的构效关系提供了新的见解。
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来源期刊
Chemical Science
Chemical Science CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
14.40
自引率
4.80%
发文量
1352
审稿时长
2.1 months
期刊介绍: Chemical Science is a journal that encompasses various disciplines within the chemical sciences. Its scope includes publishing ground-breaking research with significant implications for its respective field, as well as appealing to a wider audience in related areas. To be considered for publication, articles must showcase innovative and original advances in their field of study and be presented in a manner that is understandable to scientists from diverse backgrounds. However, the journal generally does not publish highly specialized research.
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