在金属有机框架中孤立的铜物种的工程旋转状态 改善尿素电合成
Yuhang Gao1,2, Jingnan Wang3, Yijun Yang4
1Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.
Nano-micro letters
|June 21, 2023
概括
我们设计了两个金属有机框架催化剂,CuIII-HHTP和CuII-HHTP,用于电催化尿素生产. III-HHTP由于其独特的电子结构,显示出明显更高的尿素生产率和效率.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 催化活性与活跃中心的电子状态有关,但很难阐明这种关系.
- 电催化尿素合成对于可持续的化学生产至关重要.
研究的目的:
- 设计和研究两个新的金属有机框架 (MOF) 催化剂,CuIII-HHTP和CuII-HHTP,用于电催化尿素生产.
- 了解活性中心电子状态在决定催化性能中的作用.
主要方法:
- 在MOF内部采用了协调策略来合成CuIII-HHTP和CuII-HHTP催化剂.
- 电催化性能通过测量尿素生产率和法拉第效率来评估.
- 分析了活跃中心的电子结构和反应机制.
主要成果:
- 与CuIII-HHTP相比,CuII-HHTP显著改善了尿素生产率 (7.78 mmol h-1 g-1) 和法拉第效率 (23.09%) 在-0.6 V与RHE相比,与CuII-HHTP相比显著改善了尿素生产率 (7.78 mmol h-1 g-1).
- 孤立的CuIII物种 (S=0) 被确定为CuIII-HHTP中的活性中心,与CuII物种 (S=1/2) 在CuII-HHTP中形成对比.
- CuIII-HHTP 促进了单电子迁移路径,用于 C-N 合具有较低的能量屏障,而 CuII-HHTP 则利用了两电子路径.
结论:
- 铜活性中心的电子状态极大地影响了电催化尿素的产生.
- 与CuIII-HHTP相比,具有孤立的CuIII物种的CuIII-HHTP提供了一个更有效的尿素合成途径,与CuII-HHTP相比.
- 这项研究强调了为先进的电催化应用量身定制MOF中的电子状态的潜力.
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