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使用锡和其他廉价且易于制备的过渡后金属催化剂有效地将二氧化碳转化为二氧化碳

Jonnathan Medina-Ramos¹, Rachel C Pupillo¹, Thomas P Keane¹

¹Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States.

Journal of the American Chemical Society

|February 21, 2015

概括

开发负担得起的电催化剂,将二氧化碳 (CO2) 减少为一氧化碳 (CO),是可持续燃料的关键. 锡 (Sn) 和 (Bi) 催化剂显示出高活性和选择性用于CO生产,与 (Pb) 和 (Sb) 不同.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
催化剂是一种催化剂.

背景情况:

负担得起的电催化剂对于将二氧化碳 (CO2) 转化为碳基燃料至关重要.
有效地将二氧化碳减少为一氧化碳 (CO),需要高度选择性和活跃的催化剂.
开发这些催化剂的简单合成方法对于工业可扩展性至关重要.

研究的目的:

调查使用廉价的三盐Sn(2+),Pb(2+),Bi(3+) 和Sb(3+) 作为电催化剂合成的前体.
评估电沉积Sn,Pb,Bi和Sb催化剂的性能,以减少二氧化碳到CO.
了解1,3-二甲基利米达盐在促进CO生产中的作用.

主要方法:

金属催化剂 (Sn,Pb,Bi,Sb) 从三盐前体中轻易的电沉积在乙 (MeCN) 溶液中.
在存在[BMIM]OTf.的情况下,电化学评估二氧化碳减少为二氧化碳.
分析催化剂的活性,选择性和稳定性.

主要成果:

电子沉积的Sn和Bi催化剂表现出高活性和对CO演变的选择性,在低超电位 (<250mV) 时达到5-8mA/cm的部分电流密度 (jCO).
Pb催化剂的活性显著降低 (约10%的Sn/Bi) 和快速被动化,而Sb催化剂对二氧化碳转化为二氧化碳没有任何活性.
该研究证实,1,3-二甲基利米达盐只能与适当的电催化剂一起促进CO的产生.

结论:

廉价的Sn和Bi三甲酸盐为合成高活性和选择性电催化剂提供了通用和简单的途径,用于将CO2减少到CO.
选择金属电催化剂对于高效的二氧化碳生产至关重要,Sn和Bi的性能优于Pb和Sb.
有效的二氧化碳转化依赖于二氧化碳,伊米达促进剂和正极材料之间的协同相互作用.

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