在光敏化器装饰的共价有机框架上对CO2进行光联电降解
Qiu-Jin Wu1,2, Duan-Hui Si1, Shihua Ye1,2
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou 350002, People's Republic of China.
Journal of the American Chemical Society
|August 31, 2023
概括
这项研究将光敏感的复合物整合到 - 二烯共价有机框架中,以增强电催化二氧化碳的减少. 这种新材料在可见光下显著提高了碳排放效率.
科学领域:
- 材料科学
- 电化学
- 摄影化学
背景情况:
- 电催化二氧化碳减排 (CO2RR) 对可持续化学至关重要.
- 提高CO2RR活动往往需要外部能量输入,如光.
- 活动部位的短激发状态寿命限制了光增强催化.
研究的目的:
- 开发一种用于光联电催化二氧化碳减排的新材料.
- 通过可见光提高CO2RR中的活性点的效率和寿命.
- 研究光敏感捐赠体在CO2RR催化中的作用.
主要方法:
- 将Ru(bpy) 3Cl2光敏捐赠体固定在基于基的共价有机框架 (Co-Bpy-COF) 中.
- 具有不同Ru:Co比率的Co-Bpy-COF-Ru材料的合成 (x = 1/2, 2/3).
- 在可见光和黑暗条件下对CO2RR进行电催化测试.
主要成果:
- 在光线下,最佳的Co-Bpy-COF-Ru1/2在 -0.7V与RHE下实现了96.7%的CO法拉代效率.
- 在 - 1.1 V 和 RHE 时, CO 的部分电流密度为 16. 27 mA cm-2.
- 光合催化显著优于黑暗条件,这是由于长时间的激发状态和内置电场.
结论:
- 基于的COF可以有效地用于光合的CO2RR.
- 加入Ru(bpy) 3Cl2捐赠体可以增强电子转移和催化活性.
- 这项工作为设计高效的光联电催化剂制定了新策略.
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