在PdMLPt111) 电极上的CO2减少过程中对HCOOH和CO形成的阳离子的影响
Chunmiao Ye1, Federico Dattila2, Xiaoting Chen1
1Leiden Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands.
Journal of the American Chemical Society
|August 31, 2023
概括
电离子通过促进CO2激活和化物形成,增强Pd-Pt催化剂上的电化学CO2降解 (CO2RR) 形成 (HCOOH) 和CO. 这种效应维持了较温和的酸盐产量.
科学领域:
- 电化学
- 表面科学
- 催化剂
背景情况:
- 电化学减少二氧化碳 (CO2RR) 对于可持续的化学生产至关重要.
- 了解对CO2RR催化剂的阳离子效应对于优化性能至关重要.
- - (Pd-Pt) 合金是CO2RR的有希望的电催化剂.
研究的目的:
- 在CO2RR过程中对HCOOH和CO形成的阳离子对PdMLPt的影响
- 阐明子影响二氧化碳激活和中间稳定的机制.
- 评估阴离子度对催化剂活性和选择性的影响.
主要方法:
- 在pH3的电解质中进行电化学测量,电离子度不同.
- 密度函数理论 (DFT) 模拟用于模拟阴子-表面相互作用.
- 分析HCOOH和CO的形成途径和能量.
主要成果:
- 阴离子降低了HCOOH和CO形成的潜力.
- 对于 HCOOH 生产而言,阴离子效应比对于 CO 生产更加明显.
- DFT模拟显示,通过电子极化和*CO2-稳定促进化物形成和CO2激活.
- 电离子诱导的电场抵消了工作功能的限制,在轻微的潜力下维持了HCOOH的产生.
- 在非常负的电位下,高的CO覆盖率抑制了化物形成,阻断了HCOOH通路.
结论:
- 可以显著增强Pd-Pt催化剂的CO2RR活性和选择性.
- 该机制涉及电子效应和关键中间体的稳定.
- 优化阳离子选择和度对于有效的CO2RR至关重要.
- 这项研究为了解CO2RR催化中的阴离子效应提供了一个框架.
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