控制氧性CO2的电还原到C2+的酒精超过易斯酸金属化Cu+的催化剂
Libing Zhang1,2, Jiaqi Feng1, Limin Wu1,2
1Beijing National Laboratory for Molecular Sciences, CAS Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Center for Carbon Neutral Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Journal of the American Chemical Society
|September 26, 2023
概括
将铜 (Cu) 电催化剂与 (Al) 合,可提高二氧化碳减排中的C2+醇的选择性. 这一战略稳定了关键的中间产品,提高了乙醇生产的效率和稳定性.
科学领域:
- 电化学和催化
- 用于能源应用的材料科学
- 使用二氧化碳 (CO2)
背景情况:
- 基于铜的电催化剂有望将二氧化碳转化为有价值的燃料和化学物质.
- 由于相互竞争的反应途径,在减少二氧化碳方面实现高产品选择性仍然是一个重大挑战.
- 控制催化剂表面的中间吸附对于指导反应选择性至关重要.
研究的目的:
- 通过使用铜电催化剂来改善二氧化碳二氧化醇的选择性.
- 研究将氧性金属,特别是 (Al) 引入铜催化剂的影响.
- 了解胺兴奋剂影响反应途径和产品选择性的机制.
主要方法:
- 理论计算 (例如密度函数理论) 来研究对的电子和粘合效应.
- 试验合成和表征Al-化Cu电催化剂.
- 电化学评估二氧化碳减排性能,包括法拉第效率 (FE),部分电流密度和产品选择性.
主要成果:
- 在二氧化碳电还原过程中,化催化剂对C2+醇的选择性显著提高.
- 达到了84. 5%的高总C2+法拉第效率和55. 2%的C2+酒精FE.
- 理论和实验研究表明,化剂改变了C-O和Cu-C键相互作用,稳定了*OC2H5中间体并促进了乙醇的形成.
结论:
- 在二氧化碳电还原过程中,用添加铜是一种有效的策略来增强对C2+醇的选择性.
- 这种改善的性能归因于氧相关物种的吸附变化和关键中间体的稳定.
- 这种方法显示出与其他易斯酸金属用于选择性二氧化碳转换的广泛应用的潜力.
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