尿素电氧化反应——推荐一个电化学综合实验

doi:10.3866/PKU.DXHX202212023

Abstract

Abstract:

The urea oxidation reaction (UOR) was comprehensively studied using electrochemical method, including detailed cyclic voltammetry analyses of the UOR behavior on Ni in a standard three-electrode system. The data were analyzed to extract important physical and chemical parameters of the reaction such as the diffusion coefficient, transfer coefficient, and reaction order. This experiment combined current electrocatalysis research with undergraduate electroanalysis courses and the kinetics of chemical and electrochemical reactions. A two-electrode system was used to construct a urea-assisted electrolyzer for hydrogen production to demonstrate the practical application of this system. This experiment was designed to encourage undergraduate students to use their basic knowledge to solve practical problems and stimulate their enthusiasm for scientific research.

Key words: Urea oxidation reaction, Reversible reaction, Cyclic voltammetry, Electrocatalysis

Fulin Yang, Jiaxin Li, Ligang Feng. Urea Electrooxidation Reaction: A Comprehensive Electrochemical Experiment[J].University Chemistry, 2023, 38(9): 242-251.

Figures/Tables 9

References 15

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实验参数	含义	数值
Init E/V	起始电势	0
High E/V	电势上限	0.8
Low E/V	电势下限	0
Final E/V	终止电势	0
Scan Rate/(V∙s⁻¹)	扫速	0.01–0.5
Segment	循环次数(半圈)	6
Sample Interval/V	采样间隔	0.0001
Quiet Time/s	静置时间	2
Sensitivity/(A∙V⁻¹)	灵敏度	10⁻⁵

扫速/(V∙s⁻¹)	E_pa/V	E_pa/2/V	\|E_pa − E_pa/2\|/V	i_pa/A	E_pc/V	E_pc/2/V	\|E_pc − E_pc/2\|/V	i_pc/A
0.5	0.463	0.435	0.028	0.0428	0.365	0.410	0.045	−0.040
0.2	0.456	0.434	0.022	0.0256	0.368	0.403	0.035	−0.0233
0.1	0.451	0.433	0.018	0.0171	0.369	0.399	0.030	−0.0153
0.05	0.447	0.431	0.016	0.0112	0.368	0.394	0.026	−0.00990
0.02	0.442	0.430	0.012	0.00602	0.368	0.390	0.022	−0.00527
0.01	0.438	0.428	0.010	0.00360	0.368	0.387	0.019	−0.00323

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Urea Electrooxidation Reaction: A Comprehensive Electrochemical Experiment

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