可逆波循环伏安图的测定及碳纳米管修饰电极对维生素C的电催化检测——介绍一个电化学综合实验

doi:10.3866/PKU.DXHX202101025

Abstract

Abstract:

An undergraduate comprehensive electrochemical experiment was designed and developed. Based on the reversible cyclic voltammograms, the experiment was accomplished with a carbon nanotube modified electrode prepared by droplet coating. Using a Randles-Sevcik equation, the effective area of the electrode could be well calculated. Finally, the electrocatalytic detection of vitamin C was realized. The experiment described above partly filled up the shortage of teaching resources in cyclic voltammetry electrochemical technology for undergraduates. Thus, it shows a possibility of popularization among undergraduates.

Key words: Cyclic voltammetry, Carbon nanotube, Modified electrode, Vitamin C

Kunqi Wang, Zhen Ren, Xiaona Ji, Yan Zuo, Huanxin Yang. Reversible Cyclic Voltammograms and Electrocatalytic Detection of Vitamin C by Carbon Nanotube Modified Electrode: A Comprehensive Electrochemical Experiment[J].University Chemistry, 2021, 36(9): 2101025.

实验参数	数值
Init E/V	0.6
High E/V	0.6
Low E/V	?0.2
Sean Rate/(V?s^?1)	0.1
Segment	2
Sample Interval/V	0.001
Quiet Time/s	2
Sensitivity/(A?V^?1)	1 × 10^?5

体系	扫描速度/(V?s^?1)	E_pc/V	E_pa/V	ΔE_p/V	I_pc/A	I_pa/A	I_pc/I_pa	电极有效面积/cm²
1 mmol?L^?1 K₃[Fe(CN)₆]修饰前	0.10	0.357	0.434	0.077	2.598 × 10^?5	?2.705 × 10^?5	0.96	0.0940
	0.14	0.353	0.436	0.083	3.108 × 10^?5	?3.245 × 10^?5	1.04
	0.18	0.348	0.440	0.092	3.48 × 10^?5	?3.631 × 10^?5	0.96
	0.22	0.348	0.443	0.095	3.798 × 10^?5	?3.994 × 10^?5	0.95
	0.26	0.343	0.440	0.097	4.009 × 10^?5	?4.293 × 10^?5	1.07
	0.30	0.344	0.447	0.103	4.375 × 10^?5	?4.57 × 10^?5	0.96

体系	扫描速度/(V?s^?1)	E_pc/V	E_pa/V	ΔE_p/V	I_pc/A	I_pa/A	I_pc/I_pa	电极有效面积/cm²
1 mmol?L^?1 K₃[Fe(CN)₆]修饰后	0.10	0.148	0.226	0.078	3.504 × 10^?5	?2.853 × 10^?5	1.22	0.1422
	0.14	0.148	0.231	0.083	4.092 × 10^?5	?3.377 × 10^?5	1.21
	0.18	0.148	0.235	0.087	4.724 × 10^?5	?3.808 × 10^?5	1.24
	0.22	0.141	0.236	0.095	5.245 × 10^?5	?4.232 × 10^?5	1.23
	0.26	0.141	0.237	0.096	5.786 × 10^?5	?4.668 × 10^?5	1.24
	0.30	0.137	0.241	0.104	6.310 × 10^?5	?4.953 × 10^?5	1.27

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Reversible Cyclic Voltammograms and Electrocatalytic Detection of Vitamin C by Carbon Nanotube Modified Electrode: A Comprehensive Electrochemical Experiment

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