TP2 : The effect of ceramic conductive coating on the performance and properties of titanium bipolar plate used in PEM fuel cell
Thesis > Central Library of Shahrood University > Chemical and Materials Engineering > MSc > 2016
Authors:
Mahdi Goodarzi [Author], [Supervisor], Reza Taherian[Advisor]
Abstarct: The study examined the effect of establishing titanium nitride on titanium grade 2 properties with sputtering operations, used in bipolar plate of polymer fuel cells. For this purpose, coating was conducted by using pure titanium in high purity argon gas atmosphere. Titanium nitride coating was created on substrate in different thickness, 200nm, 350nm and 500nm respectively at the time of 120, 150 and 180 minutes. During the coating process, Argon and Oxygen gases was flowing in ratio on 12 to 1. Different phases in coating laxyer were identified using XRD analysis and the corrosion resistance of the samples was investigated by polarization analyses in a half-molar solution of H2SO4 and HF. The XRD results showed that all three samples are containing titanium nitride phase. The cross section SEM results showed that titanium nitride laxyer with good adhesion is formed on titanium substrate and interaction between nitrogen in chamber resulted in the formation of a zone of penetration in the joint with good adhesion. By increasing the time of coating, thickness increases. The EDS results showed the coating was created with equal proportions of nitrogen and titanium. Corrosion resistance tests showed nitride coating increase corrosion resistance also increasing the thickness of samples from 200nm to 500nm increases the corrosion resistance, so that the corrosion current density was reduced from 6/29µA/cm² for uncoated sample to 1/83µA/cm² for 500nm coated sample. To obtain the optimal parameters in fuel cell production, the ICR tests were performed on samples at different pressures between the samples and devices. Contact resistance decreased with increasing thickness of the coating applied on samples from 62mΩ.cm2 in 200nm coated sample to 33mΩ.cm2 in 500nm coated sample. This is due to better conductivity on coated sample without titanium oxide laxyer.
Keywords:
#fuel cell #bipolar plates #sputtering #titanium nitride coating #ICR #corrosion resistance Link
Keeping place: Central Library of Shahrood University
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