Application of pulse electrodeposition PbO2 coating on stainless steel bipolar plate of PEMFC

被引：0
|
作者：
Yu H. [1 ,2 ]
Guo Q. [1 ]
Du K. [1 ]
Wang C. [1 ]
机构：
[1] Institute of Metal Research, Chinese Academy of Sciences, Liaoning, Shenyang
[2] School of Materials Science and Engingeering, University of Science and Technology of China, Liaoning, Shenyang
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 02期
关键词：
bipolar plates; film; fuel cell; high potential; pulse electrodeposition;
D O I：
10.16085/j.issn.1000-6613.2022-0710
中图分类号：
学科分类号：
摘要：
The electrodeposited PbO2 coating on stainless steel is feasible to apply on the cathode plate of proton exchange membrane fuel cell, but the PbO2 coating prepared by the direct current (DC) process has poor compactness and insufficient corrosion resistance. In this paper, the pulse-controlled process of electrodepositing PbO2 coating on 316 stainless steel was studied, the effects of parameters such as current density, frequency and duty cycle on the growth rate and microstructure were investigated, and the performance of the coating in the fuel cell environment was further investigated. Focusing on the electrochemical performance of PbO2 coating at high potentials. the microstructure and XRD results showed that the PbO2 coating by pulse electrodeposition had finer grains and denser structure than the coating by DC. The potentiodynamic polarization results indicated that the corrosion potential of the pulsed coating was slightly higher than that of the DC, and the corrosion current density was reduced by an order of magnitude. In the high potential polarization test, compared with the DC coating, the current density of the pulse process coating was significantly lower, the stability of the coating was significantly improved, the damage degree under high potential was less, and the substrate could be better protected. The polarization test at working potential showed that the reduction of PbO2was more serious in the anodic environment, but only a slight reduction occured in the cathodic environment. In a word, compared with the DC coating, the microstructure of the pulse coating was denser and finer, and had good corrosion resistance, especially the better stability at high potential, and it had a better application on the PEMFC cathode plate. © 2023 Chemical Industry Press. All rights reserved.
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页码：917 / 924
页数：7
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