大学化学 >> 2026, Vol. 41 >> Issue (5): 91-100.doi: 10.12461/PKU.DXHX202511082

所属专题： 第5届全国大学生化学实验创新设计大赛

专题 上一篇    

基于旋转电极双通道新方法的铁氰化钾电化学反应过程分析改进实验

李亚伟, 李思明, 段福浩, 王煦然, 赵洋洋, 张越, 郭炜, 郝俊生   

  1. 山西大学化学化工学院, 山西 太原 030006
  • 收稿日期:2025-11-13 录用日期:2026-02-25 发布日期:2026-05-21
  • 通讯作者: 李亚伟, 郝俊生, 郭炜 E-mail:yaweili@sxu.edu.cn;jshao@sxu.edu.cn;guow@sxu.edu.cn Yawei Li, Junsheng Hao, Wei Guo
  • 基金资助:
    2025年山西省高等学校教学改革创新项目(J20250009)

Improved experiment of potassium ferricyanide electrochemical reaction process analysis based on a new method of rotating electrode dual channel

Yawei Li, Siming Li, Fuhao Duan, Xuran Wang, Yangyang Zhao, Yue Zhang, Wei Guo, Junsheng Hao   

  1. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, Shanxi Province, China
  • Received:2025-11-13 Accepted:2026-02-25 Published:2026-05-21
  • Contact: Yawei Li, Junsheng Hao, Wei Guo E-mail:yaweili@sxu.edu.cn;jshao@sxu.edu.cn;guow@sxu.edu.cn

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摘要： 传统“循环伏安法测定铁氰化钾的电极反应过程”在静态条件下进行，不能有效捕捉传质过程对反应速率的影响，仅能提供热力学参数(如峰电位差，ΔEp)，却无法深入分析反应动力学，限制了学生对反应机制的全面理解。本实验针对仪器分析实验中传统铁氰化钾电极反应实验的局限性，创新性地引入旋转环盘电极(RRDE)技术，构建多参数检测平台。通过盘电极扫描铁氰化钾还原主反应，同步利用环电极恒电位氧化捕获中间副产物，结合Koutecký-Levich方程定量解析传质与反应动力学的竞争机制。实验通过计算电极反应的动力学电流密度与副产物占比，使学生对铁氰化钾的电化学反应过程机制有了更深理解。此外，实验过程中通过优化电极和反应环境清洁度，使学生们测定的铁氰化钾电化学氧化还原ΔEp接近于热力学理想值。该实验设计突破了传统静态体系的局限，为电化学教学衔接前沿科研提供了创新路径。改进后的实验已成功应用于本校化学专业大三年级“仪器分析实验”教学，开设2个学期，覆盖6个教学班共176名学生。

关键词: 旋转环盘电极, 铁氰化钾, 电化学动力学, 传质过程, Koutecký-Levich方程

Abstract: Conventional cyclic voltammetry (CV) experiments for investigating the electrode reaction process of potassium ferricyanide are performed under static conditions, which inherently limits the ability to assess mass transport effects on reaction rates. While this approach yields thermodynamic parameters such as peak potential difference (△Ep), it provides insufficient insight into reaction kinetics, consequently restricting students’ comprehensive understanding of the reaction mechanism. To address these limitations in instrumental analysis teaching, we developed an innovative experimental approach incorporating Rotating Ring-Disk Electrode (RRDE) technology to establish a multi-parameter detection platform. The disk electrode scans the primary reduction reaction of potassium ferricyanide, while the ring electrode simultaneously captures intermediate byproducts through constant potential oxidation. By applying the Koutecký-Levich equation, we quantitatively analyze the competitive relationship between mass transport and reaction kinetics. Students gain deeper mechanistic understanding by calculating the kinetic current density and byproduct distribution ratio. Furthermore, optimized electrode preparation and reaction environment cleanliness enabled measured △Ep values to approach thermodynamic ideal values. This experimental design overcomes the constraints of traditional static systems and provides an innovative approach for connecting electrochemical education with advanced research. The improved experiment has been successfully implemented in our “Instrumental Analysis Experiment” course for third-year chemistry majors, reaching 176 students across six classes over two semesters.

Key words: Rotating ring-disk electrode, Potassium ferricyanide, Electrochemical kinetics, Mass transfer process, Koutecký-Levich equation