{"title":"晶体缺陷诱发金属有机框架光催化剂激发态寿命延长,从而增强可见光介导的二氧化碳还原。","authors":"Zhifen Guo, Xin Liu, Yan Che, Hongzhu Xing","doi":"10.1021/acs.inorgchem.4c01738","DOIUrl":null,"url":null,"abstract":"<p><p>We report the structural defects in Zr-metal-organic framework (MOFs) for achieving highly efficient CO<sub>2</sub> reduction under visible light irradiation. A series of defective Zr-MOF-<i>X</i> (<i>X</i> = 160, 240, 320, or 400) are synthesized by acid-regulated defect engineering. Compared to pristine defect-free Zr-MOF (NNU-28), N<sub>2</sub> uptake increases for Zr-MOF-<i>X</i> synthesized with the HAc modulator, producing a larger pore space and Brunauer-Emmett-Teller surface area. The pore size distribution demonstrates that defective Zr-MOF-<i>X</i> exhibits mesoporous structures. Electrochemistry tests show that defective Zr-MOF-<i>X</i> possesses a more negative reduction potential and a higher photocurrent responsive signal than that of pristine NNU-28. Consequently, the defective samples exhibit a significantly higher efficiency in the photoreduction of CO<sub>2</sub> to formate. Transient absorption spectroscopies manifest that structural defects modulate the excited-state behivior of Zr-MOF-<i>X</i> and improve the photogenerated charge separation of Zr-MOF-<i>X</i>. Furthermore, electron paramagnetic resonance and in-suit X-ray photoelectron spectroscopy provide additional evidence of the high photocatalytic performance exhibited by defective Zr-MOF-<i>X</i>. Results demonstrate that structural defects in Zr-MOF-<i>X</i> also improve the charge transfer, producing abundant Zr(III) catalytically active sites, exhibiting a slower decay process than defect-free Zr-MOF. The long-lifetime Zr(III) species in defective Zr-MOF-<i>X</i> are fully exposed to a high-concentration CO<sub>2</sub> atmosphere, thereby enhancing the photocatalytic efficiency of CO<sub>2</sub> reduction.</p>","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":null,"pages":null},"PeriodicalIF":4.3000,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Crystal-Defect-Induced Longer Lifetime of Excited States in a Metal-Organic Framework Photocatalyst to Enhance Visible-Light-Mediated CO<sub>2</sub> Reduction.\",\"authors\":\"Zhifen Guo, Xin Liu, Yan Che, Hongzhu Xing\",\"doi\":\"10.1021/acs.inorgchem.4c01738\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>We report the structural defects in Zr-metal-organic framework (MOFs) for achieving highly efficient CO<sub>2</sub> reduction under visible light irradiation. A series of defective Zr-MOF-<i>X</i> (<i>X</i> = 160, 240, 320, or 400) are synthesized by acid-regulated defect engineering. Compared to pristine defect-free Zr-MOF (NNU-28), N<sub>2</sub> uptake increases for Zr-MOF-<i>X</i> synthesized with the HAc modulator, producing a larger pore space and Brunauer-Emmett-Teller surface area. The pore size distribution demonstrates that defective Zr-MOF-<i>X</i> exhibits mesoporous structures. Electrochemistry tests show that defective Zr-MOF-<i>X</i> possesses a more negative reduction potential and a higher photocurrent responsive signal than that of pristine NNU-28. Consequently, the defective samples exhibit a significantly higher efficiency in the photoreduction of CO<sub>2</sub> to formate. Transient absorption spectroscopies manifest that structural defects modulate the excited-state behivior of Zr-MOF-<i>X</i> and improve the photogenerated charge separation of Zr-MOF-<i>X</i>. Furthermore, electron paramagnetic resonance and in-suit X-ray photoelectron spectroscopy provide additional evidence of the high photocatalytic performance exhibited by defective Zr-MOF-<i>X</i>. Results demonstrate that structural defects in Zr-MOF-<i>X</i> also improve the charge transfer, producing abundant Zr(III) catalytically active sites, exhibiting a slower decay process than defect-free Zr-MOF. The long-lifetime Zr(III) species in defective Zr-MOF-<i>X</i> are fully exposed to a high-concentration CO<sub>2</sub> atmosphere, thereby enhancing the photocatalytic efficiency of CO<sub>2</sub> reduction.</p>\",\"PeriodicalId\":40,\"journal\":{\"name\":\"Inorganic Chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2024-07-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Inorganic Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1021/acs.inorgchem.4c01738\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acs.inorgchem.4c01738","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
摘要
我们报告了在可见光照射下实现高效二氧化碳还原的 Zr-金属有机框架 (MOF) 结构缺陷。我们通过酸调控缺陷工程合成了一系列有缺陷的 Zr-MOF-X(X = 160、240、320 或 400)。与原始无缺陷 Zr-MOF(NNU-28)相比,使用 HAc 调节剂合成的 Zr-MOF-X 对 N2 的吸收增加,产生了更大的孔隙空间和布鲁瑙尔-艾美特-泰勒表面积。孔径分布表明,有缺陷的 Zr-MOF-X 具有介孔结构。电化学测试表明,与原始 NNU-28 相比,有缺陷的 Zr-MOF-X 具有更负的还原电位和更高的光电流响应信号。因此,有缺陷的样品在将 CO2 光还原成甲酸盐的过程中表现出更高的效率。瞬态吸收光谱显示,结构缺陷调节了 Zr-MOF-X 的激发态行为,并改善了 Zr-MOF-X 的光生电荷分离。此外,电子顺磁共振和装入式 X 射线光电子能谱还进一步证明了有缺陷的 Zr-MOF-X 具有很高的光催化性能。结果表明,Zr-MOF-X 中的结构缺陷还能改善电荷转移,产生丰富的 Zr(III)催化活性位点,与无缺陷的 Zr-MOF 相比,其衰减过程更慢。缺陷 Zr-MOF-X 中的长寿命 Zr(III) 物种可充分暴露在高浓度 CO2 环境中,从而提高了光催化还原 CO2 的效率。
Crystal-Defect-Induced Longer Lifetime of Excited States in a Metal-Organic Framework Photocatalyst to Enhance Visible-Light-Mediated CO2 Reduction.
We report the structural defects in Zr-metal-organic framework (MOFs) for achieving highly efficient CO2 reduction under visible light irradiation. A series of defective Zr-MOF-X (X = 160, 240, 320, or 400) are synthesized by acid-regulated defect engineering. Compared to pristine defect-free Zr-MOF (NNU-28), N2 uptake increases for Zr-MOF-X synthesized with the HAc modulator, producing a larger pore space and Brunauer-Emmett-Teller surface area. The pore size distribution demonstrates that defective Zr-MOF-X exhibits mesoporous structures. Electrochemistry tests show that defective Zr-MOF-X possesses a more negative reduction potential and a higher photocurrent responsive signal than that of pristine NNU-28. Consequently, the defective samples exhibit a significantly higher efficiency in the photoreduction of CO2 to formate. Transient absorption spectroscopies manifest that structural defects modulate the excited-state behivior of Zr-MOF-X and improve the photogenerated charge separation of Zr-MOF-X. Furthermore, electron paramagnetic resonance and in-suit X-ray photoelectron spectroscopy provide additional evidence of the high photocatalytic performance exhibited by defective Zr-MOF-X. Results demonstrate that structural defects in Zr-MOF-X also improve the charge transfer, producing abundant Zr(III) catalytically active sites, exhibiting a slower decay process than defect-free Zr-MOF. The long-lifetime Zr(III) species in defective Zr-MOF-X are fully exposed to a high-concentration CO2 atmosphere, thereby enhancing the photocatalytic efficiency of CO2 reduction.
期刊介绍:
Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.