在CO2捕获和电化学减少的金属有机框架中模块电子轨道的调节
Li-Yang Shao1, Shuo Wang1, Shu-Ni Li1
1Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, PR China.
Inorganic chemistry
|September 27, 2024
概括
基于三核集群的新型有缺陷的金属有机框架 (MOF) 展示了同时捕获二氧化碳 (CO2) 和电化学CO2减排反应 (CO2RR) 的能力. 在SNNU-42中调整InMg比率显著提高了CO2RR性能,为C1产品带来了高效率.
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.
- 环境科学 环境科学
背景情况:
- 开发有效的催化剂,同时捕获二氧化碳 (CO2) 和电化学二氧化碳减排反应 (CO2RR) 是缓解气候变化的关键.
- 现有的方法在同时在二氧化碳捕获和CO2RR过程中实现高性能方面面临挑战.
- 金属有机框架 (MOF) 为催化应用提供可调节的结构.
研究的目的:
- 设计和合成基于三核集群的新型有缺陷的MOF,用于同时捕获CO2和CO2RR.
- 调查控制二氧化碳捕获和二氧化碳回收效率的结构-属性关系.
- 优化MOF的组成,以提高电化学二氧化碳的减少.
主要方法:
- 合成了两种新的InMg缺陷三核集群基础的MOF,SNNU-41和SNNU-42.
- MOF结构的特征,包括多孔性和电子性质.
- 在不同压力下评估二氧化碳捕获能力.
- 电化学CO2RR性能测试,包括不同电位的法拉第效率和选择性测量.
主要成果:
- 无论是SNNU-41还是SNNU-42都表现出了同时捕获二氧化碳和CO2RR的能力.
- 由于其适合的微孔,SNNU-41表现出卓越的二氧化碳捕获能力.
- 凭借其刚性框架和优化的电子结构,SNNU-42加速了CO2转化为C1产品的过程.
- 在SNNU-42中调整InMg比率显著提高了CO2RR性能.
- SNNU-42 (InMg 1:1.8) 在C1产品中实现了91.3%的法拉代克效率和72.0%的HCOOH选择性在-2.5V下,电流密度为77.2mA cm-2.2,电流密度为77.2mA cm-2.
结论:
- 缺陷的三核集群基MOF是集成CO2捕获和电化学减排的有希望的候选者.
- 调节MOF的电子结构和组成,特别是InMg比率,是提高CO2RR性能的有效策略.
- 这项工作为通过MOF设计开发高效的二氧化碳利用电催化剂提供了可行的途径.
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