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为减少二氧化碳调节纳米粒子电催化剂的分子表面功能化方法

Zhi Cao, Dohyung Kim, Dachao Hong

¹Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan, Shanxi 030001, China.

Journal of the American Chemical Society

|June 21, 2016

概括

研究人员开发了一种新型的分子表面功能化方法,以增强金纳米粒子 (Au NP) 催化剂,将二氧化碳 (CO2) 转化为有价值的产品,提高电化学减少的效率和电流密度.

科学领域:

* 纳米材料科学
* 电化学
* 可持续能源研究

背景情况:

*将温室气体二氧化碳 (CO2) 转化为增值产品对于可持续能源至关重要.
* 纳米材料,特别是金纳米粒子 (AuNP),是CO2转换的有希望的异质催化剂.
调整催化剂的特性对于提高效率和选择性至关重要.

研究的目的:

探索分子表面功能化作为优化Au NP电催化剂的策略.
* 调查N-异环碳素 (NHC) 功能化对Au NP减少二氧化碳性能的影响.
* 了解分子连接物如何影响二氧化碳转化为一氧化碳的催化机制.

主要方法:

*合成的N-异环碳素 (NHC) 功能化黄金纳米粒子 (Au NPs).
使用电化学方法研究使用功能化和原始AuNP的二氧化碳降解.
使用法拉达效率 (FE) 和电流密度测量分析了催化性能.
* 采用塔菲尔图谱来研究分子配体对反应机制的影响.

主要成果:

* 通过NHC功能化的AuNP显著改善了CO2降低到CO的性能.
功能化AUNP的平均效率 (FE) 为83%,而母AUNP的效率为53%.
* 在0.46V的超电位下观察到电流密度增加了7.6倍.
* 塔菲尔图显示NHC连接物改变了二氧化碳减排的机制路径.

结论:

*分子表面功能化是设计先进纳米粒子催化剂的有效策略.
* NHC功能化提高了Au NP的电催化活性和减少二氧化碳的效率.
这种方法补充了现有的方法,例如控制催化剂设计的尺寸,形状,组成和缺陷.

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