电加热微电极传热模式的结构依赖性研究

doi:10.13208/j.electrochem.2203211

电化学（中英文） ›› 2023, Vol. 29 ›› Issue (9): 2203211. doi: 10.13208/j.electrochem.2203211

电加热微电极传热模式的结构依赖性研究

李炬^a^,^b^,^*(), 杨森^b^,^c, 孙建军^c^,^*()

^a河南工贸职业学院，河南郑州 451191
^b郑州大学药学院，河南省肿瘤重大疾病靶向治疗与诊断重点实验室，教育部药物关键制备技术重点实验室，药物安全性评价研究中心，河南郑州 450001
^c福州大学化学学院，教育部食品安全与生物分析科学重点实验室，福建省食品安全分析检测技术重点实验室，福建福州 350108

收稿日期:2022-03-21 修回日期:2022-04-27 接受日期:2022-04-28 出版日期:2023-09-28 发布日期:2022-05-07

Dependence of Heat Transfer Model on the Structure of Electrically Coil-Heated Microelectrodes

Ju Li^a^,^b^,^*(), Sen Yang^b^,^c, Jian-Jun Sun^c^,^*()

^aSchool of Henan Industry and Trade Vocational College, Zhengzhou, Henan Province 451191, China
^bKey Laboratory of Targeting Therapy and Diagnosis for Critical Diseases, Henan Province, Key laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Collaborative Innovation Center of New Drug Research and Safety Evaluation, Scbn hool of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China
^cMinistry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China

Received:2022-03-21 Revised:2022-04-27 Accepted:2022-04-28 Published:2023-09-28 Online:2022-05-07
Contact: *Tel: (86-371)67781891, E-mail: liju1124@zzu.edu.cn; Tel: (86-591)22866136, E-mail: jjsun@fzu.edu.cn

摘要/Abstract

摘要：

近年来，电加热微电极在电分析化学中得到了广泛的关注。研究表明，在高温下促进质量传输和反应动力学通常会导致电流信号增加。然而，目前还没有关于微电极内部传热的研究，这对于微传感器的设计和操作是必要的。本文利用有限元模拟软件（COMSOL）来分析影响表面温度（T_s）的因素，这对线圈加热的微盘电极的加热能力至关重要。电极表面和加热铜线底部之间的距离也与T_s（R² = 1）有良好的线性关系。考虑到成本，25 mm长的金丝足以获得相对较高的T_s。此外，当电极材料为金且金盘直径为0.2 mm时，可以获得最高的T_s。本文还研究了不同温度下加热铜线直径与电流的关系。仿真结果有望为电加热微传感器的设计和实际应用提供重要帮助。

关键词: 电加热微电极, 传热, 微盘, 线圈加热, 模型, COMSOL, 温度分布

Abstract:

Electrically heated microelectrodes have gained much attention in electroanalytical chemistry in recent years. It has been shown that the promotion of mass transport and reaction kinetics at high-temperatures often results in increased current signals. However, there is no study about the heat transfer inner the microelectrodes which is necessary for the design and operation for microsensors. This report introduces a finite element software (COMSOL) to analyze the factors that influence the surface temperature (T_s), which is crucial for the heating ability of micro-disk electrodes with coils. Distances between the electrode surface and the bottom of the heated copper wire also have a good linear relationship with T_s (R² = 1). Considering the cost, 25-mm length of the gold wire is enough to obtain a relatively high T_s. In addition, the highest T_s can be obtained when the electrode material is gold and the diameter of the gold disk is 0.2 mm. The relationship of diameters of heated copper wires with currents to obtain different temperatures has also been studied. It is expectable that the simulation results can be used to significantly help the design and operation of electrically heated microsensors in practical applications.

Key words: Electrically heated microelectrodes, Heat transfer, Micro-disk, Coil-heated, Model, COMSOL, Temperature distribution

李炬, 杨森, 孙建军. 电加热微电极传热模式的结构依赖性研究[J]. 电化学（中英文）, 2023, 29(9): 2203211.

Ju Li, Sen Yang, Jian-Jun Sun. Dependence of Heat Transfer Model on the Structure of Electrically Coil-Heated Microelectrodes[J]. Journal of Electrochemistry, 2023, 29(9): 2203211.

图/表 6

参考文献 35

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T_s (°C)	Fitting Equation	R²
40	I = −0.008+0.009D₂	0.9960
60	I = −0.020+0.012D₂	0.9960
100	I = −0.028+0.0145D₂	0.9995
120	I = −0.028+0.0154D₂	0.9999
150	I = −0.031+0.0166D₂	0.9999

Electrode material	¹λ (W·m⁻²·K⁻¹)	T_s (°C)	²T_h (°C)	³∆T (°C)
Silver	429	44.7	47.6	2.9
Copper	400	44.8	47.9	3.1
Gold	317	45.0	48.7	3.7
Graphite	150	44.5	51.7	7.2
Nickel	90.7	43.5	53.5	10
Platinum	71.6	42.6	54.5	11.9

电加热微电极传热模式的结构依赖性研究

Dependence of Heat Transfer Model on the Structure of Electrically Coil-Heated Microelectrodes

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