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最新COF | 太原理工大学吴旭、邓杨Angew:COF中单重态与三重态激发的切换实现高效光催化

  • 2026-05-08 15:49:29
最新COF | 太原理工大学吴旭、邓杨Angew:COF中单重态与三重态激发的切换实现高效光催化

一句话总结

太原理工大学吴旭教授、邓杨副教授设计合成三种不同层间错位堆叠角度的噻吩基 COF,通过精准调控 π-π 堆积方式实现单重态 (S₁)→三重态 (T₁) 系间窜越的可控开关,分别主导超氧自由基与单线态氧生成,显著提升光催化氧化与矿化性能。相关工作发表在Angewandte Chemie International Edition

一句话介绍研究背景

光催化中电子转移与能量传递是两条竞争路径,单重态激子易复合、三重态激子寿命长更利于能量转移;但在 COF 中如何通过晶体堆积精准调控激发态路径与活性氧种类,仍是提升选择性与效率的核心科学问题。

实验方法

  • 采用硼酸酯缩合反应合成 BDD-HHTP-COF、BDT-HHTP-COF、BDT-CTC-COF;

  • PXRD、FT-IR、Raman、TEM、BET 表征晶体结构、官能团、形貌与孔道;

  • UV-Vis、PL、TRPL、瞬态光电流、EIS、KPFM 分析光物理与载流子行为;

  • EPR(DMPO/TEMP)鉴定・O₂⁻与 ¹O₂,原位 DRIFTS 追踪氧活化中间态;

  • 飞秒瞬态吸收(fs-TAS)揭示激发态动力学,DFT 计算自旋轨道耦合与能隙;

  • 可见光下进行甲苯降解与 CO₂矿化测试,评价活性与稳定性。

图文解析

图 1|(a) 三种共价有机框架的合成路线与分子结构;(b–d) 分别为 BDD-HHTP-COF、BDT-HHTP-COF、BDT-CTC-COF 的层间堆叠空间填充模型。

图 2|(a–c) BDD-HHTP-COF、BDT-HHTP-COF、BDT-CTC-COF 的实验粉末衍射与模拟衍射图谱;(d) 三种 COF 的 N₂吸脱附等温线及孔径分布;(e) 单体与 COFs 的红外光谱;(f) 单体与 COFs 的拉曼光谱;(g–l) 三种 COF 的高分辨透射电镜图像。

图 3|(a) 紫外 - 可见漫反射吸收光谱;(b) 稳态荧光光谱;(c) 时间分辨荧光衰减曲线;(d) 瞬态光电流响应;(e) 电化学阻抗谱;(f) 禁带宽度 Tauc 图;(g) 价带 X 射线光电子能谱;(h) 电子能带结构示意图;(i–k) 暗态与光照下的开尔文探针力显微镜表面电势及差值;(l) DMPO 捕获超氧阴离子自由基的电子顺磁共振谱;(m–n) TEMP 捕获单线态氧的电子顺磁共振谱。

图 4|(a) 三重态激子生成及单线态氧产生的能量转移过程示意图;(b) 三种 COF 主要光物理性质对比雷达图;(c) COF 光催化活化氧气的机制示意图;(d–f) BDT-HHTP-COF、BDD-HHTP-COF、BDT-CTC-COF 的飞秒瞬态吸收光谱及信号归属;(g–i) 三种 COF 的飞秒瞬态吸收二维伪色图;(j–l) 三种 COF 的激发态衰减动力学曲线。

图 5|(a) 三种 COF 的最高占据分子轨道与最低未占据分子轨道电子云分布;(b) 芳香环层间错位堆叠与面对面堆叠的静电相互作用差异;(c) 三种 COF 的光激发空穴 (蓝)- 电子 (绿) 分布及原子贡献。

图 6|a–c) 三种 COF 不同活性位点上氧气活化的吉布斯自由能变化;(d–f) 可见光下三种 COF 光催化体系的原位漫反射红外光谱;(g) BDT-CTC-COF 中 T₁能量转移路径与 BDT-HHTP-COF 中 S₁电子转移路径的氧活化机制。

图 7|(a) 三种 COF 光催化甲苯降解曲线;(b) 准一级动力学速率常数拟合;(c) 不同氧气比例下甲苯的降解曲线;(d) 甲苯降解效率与 CO₂矿化率对比;(e) 不同捕获剂存在下的甲苯降解效果;(f) 催化剂循环稳定性测试;(g–i) 甲苯光催化氧化过程的原位红外光谱,监测中间产物演化。

📜 文章链接:

https://onlinelibrary.wiley.com/doi/10.1002/anie.8843840

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  1. CONNECT:[ UseTime:0.000536s ] mysql:host=127.0.0.1;port=3306;dbname=h460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000677s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000323s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000263s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000559s ]
  6. SELECT * FROM `set` [ RunTime:0.000215s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000592s ]
  8. SELECT * FROM `article` WHERE `id` = 501318 LIMIT 1 [ RunTime:0.000642s ]
  9. UPDATE `article` SET `lasttime` = 1779900892 WHERE `id` = 501318 [ RunTime:0.000673s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000278s ]
  11. SELECT * FROM `article` WHERE `id` < 501318 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000479s ]
  12. SELECT * FROM `article` WHERE `id` > 501318 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000435s ]
  13. SELECT * FROM `article` WHERE `id` < 501318 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000788s ]
  14. SELECT * FROM `article` WHERE `id` < 501318 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001086s ]
  15. SELECT * FROM `article` WHERE `id` < 501318 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003075s ]
0.081959s