Dependence of Heat Transfer Model on the Structure of Electrically Coil-heated Microelectrodes
Document Type
Article
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 (Ts), which is crucial for the heating ability of micro-disk electrodes with coil-heated. Distances between the electrode surface and the bottom of the heated copper wire also has a good linear relationship with Ts (R2 = 1). Considering the costs, 25 mm length of the gold wire is enough to obtain a relative high Ts. In addition, highest Ts 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 temperature has also been studied. It is expectable that the simulation results be used to significantly help the design and operation of electrically heated microsensors in practical applications.
Graphical Abstract
Keywords
Electrically heated microelectrodes, Heat transfer, Micro-disk, Coil-heated, Model, COMSOL, Temperature distribution
DOI
10.13208/j.electrochem.2203211
Online Date
5-7-2022
Recommended Citation
Ju Li, Sen Yang, Jian-Jun Sun. Dependence of Heat Transfer Model on the Structure of Electrically Coil-heated Microelectrodes[J]. Journal of Electrochemistry, doi: 10.13208/j.electrochem.2203211.