工程高度选择性的CO2电还原在基于Cu的矿中,通过A位点阴离子操纵
Shuaibing Yang1,2, Xiao-Min Chen1,2, Tao Shao2
1College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China.
Physical chemistry chemical physics : PCCP
|June 14, 2024
概括
用Ce或Sr对矿氧化物进行补充,可增强电催化二氧化碳的减少. 该战略通过促进关键反应中间体和增加活性表面积,提高甲和一氧化碳生产效率.
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:
- 矿氧化物作为催化剂具有前景,但它们在减少二氧化碳中的使用需要优化.
- 了解如何调整矿的性能以提高CO2RR对于开发高效的催化剂至关重要.
研究的目的:
- 增强矿氧化物的电催化活性,以减少二氧化碳.
- 研究A位离子兴奋剂 (Ce和Sr) 对CO2RR的La2CuO4的影响.
- 阐明改善催化性能背后的机制.
主要方法:
- 合成Ce-doped La2CuO4 (LCCO) 和Sr-doped La2CuO4 (LSCO) 的矿氧化物.
- 电化学表征包括法拉第效率测量在-1.4V与RHE.
- 在现场ATR-FTIR光谱学以确定反应中间体.
- 测量XPS,EPR和Cdl以分析材料特性和活性表面积.
主要成果:
- LCCO显示,CH4的法拉第效率从38.9%提高到59.4%.
- 在LSCO中,CO法拉第效率从68.8%提高到85.4%.
- 兴奋剂促进了*CHO和*HCOO中间体的形成,增加了氧气空缺和电化学活性表面积.
结论:
- A位点离子兴奋剂是一种有效的策略,可以提高矿氧化物的CO2RR性能.
- 性能改善归因于关键中间体的形成,氧气空缺的增加和更高的电化学活性表面积.
- 这项研究提供了对调整矿催化剂的见解,以实现高效的二氧化碳转化.
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