有效的电还原CO2到C1和C2产品使用原子分散N-C@石墨催化剂
Farzaneh Yari1, Simon Offenthaler1, Sankit Vala1
1Institute of Organic Chemistry, Laboratory for Sustainable Chemistry and Catalysis (LSusCat), Johannes Kepler University Linz Altenberger Straße 69 4040 Linz Austria wolfgang.schoefberger@jku.at https://www.jku.at/en/institute-of-organic-chemistry/team/schoefberger-lab.
本研究引入和联合合的石墨 (-N-C@石墨) 作为减少二氧化碳的无金属电催化剂. 该材料对CO2RR产品具有可调节的选择性和高稳定性,为高效的二氧化碳转化铺平了道路.
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:
- 对于开发高效的无金属电催化剂来说,对活性点的原子精确控制至关重要.
- 二氧化碳减排反应 (CO2RR) 是可持续能源和化学生产的关键过程.
研究的目的:
- 通过使用CO2RR的分子前体合成和表征和联合合的石墨 (-N-C@石墨).
- 研究开发的电催化剂的结构-活性关系和机械路径.
- 评估催化剂在减少二氧化碳中的性能和稳定性.
主要方法:
- 从-子亚氨酸 (Cl-B-SubPc) 合成-N-C@石墨,通过热解.
- 使用X射线光电子谱学 (XPS) 进行表征,以识别B-C,B-N和N图案.
- 在零间隙电解器中,对CO2RR性能,包括选择性和稳定性的电化学评估.
主要成果:
- 热解温度影响催化剂结构和CO2RR选择性:800°C有利于甲酸盐/乙酸盐,而1000°C提高了CO选择性 (高达26.9%FE).
- B-N协同作用稳定了二氧化碳中间体,抑制了进化,并促进了C-C合.
- 催化剂表现出长期稳定性 (>180小时) 并达到工业相关的电流密度 (150mA cm-2) 与高CO FE (79.0%和87.4%).
结论:
- 来自分子前体的和联合化碳为CO2RR提供了一个多功能平台.
- 通过B-N辅助兴奋剂对活性部位的精确控制,可以合理设计高性能,无金属的电催化剂.
- 这种方法有助于阐明活性站点化学,并推进可持续的二氧化碳转化技术.
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