实时检测通过使用扫描电化学显微镜在操作电极上通过氧活性导管形成产生的基
Jaxiry S Barroso-Martínez1,2, Adolfo I B Romo1, Sanja Pudar1
1Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, 600 South Mathews Ave., Urbana, Illinois61801, United States.
Journal of the American Chemical Society
|October 10, 2022
概括
我们开发了一种新的方法来检测基基 (•OH) 使用氧化还原活性添加物,使其能够实时监测它们在废水处理和电合成的电极表面上的生成.
科学领域:
- 电化学 电化学 电化学
- 分析化学 分析化学
- 环境科学 环境科学
背景情况:
- 基基 (•OH) 是强大的氧化剂,在废水处理和电合成中具有应用.
- 在现场检测OH是困难的,因为它的寿命很短.
- 目前的方法,如电子自旋共振 (ESR) 使用自旋陷是繁的,缺乏灵敏度.
研究的目的:
- 开发一种灵敏和多功能方法,用于实时检测电极表面的OH生成.
- 在各种电极材料中量化OH生成效率.
- 为了使OH在电化学过程中的知情探索.
主要方法:
- 利用5,5-二甲基-1-罗林N-氧化物 (DMPO) 形成氧化还原活性[DMPO-OH]•添加物.
- 使用扫描电化学显微镜 (SECM) 与超微电极进行现场检测.
- 通过密度函数计算和ESR测量验证的结果.
主要成果:
- 确定了[DMPO-OH]•附加物作为氧化还原活性 (E0 = 0.85 V与Ag
- 从操作电极成功检测和成像实时[DMPO-OH]•生成.
- 量化和比较不同电极材料的OH生成效率.
结论:
- 开发的SECM方法允许快速,廉价和定量检测OH.
- 这种技术可以实时监测电极表面的OH动态.
- 研究结果支持使用这种方法来优化能源,环境和合成中的电化学应用.
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