The Potential Effect on the Performance of CrN/Cr-Coated SS316L Bipolar Plates and Their Durability in Simulated Cathodic HT-PEFC Environments

Ruiyu Li, Yun Cai (), Yilin Liu, Ziqi Xie, Klaus Wippermann and Werner Lehnert
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Ruiyu Li: DeepHytec Co., Ltd., Shenzhen 518118, China
Yun Cai: DeepHytec Co., Ltd., Shenzhen 518118, China
Yilin Liu: DeepHytec Co., Ltd., Shenzhen 518118, China
Ziqi Xie: DeepHytec Co., Ltd., Shenzhen 518118, China
Klaus Wippermann: Institute of Energy and Climate Research (IEK-14), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
Werner Lehnert: Faculty of Mechanical Engineering, RWTH Aachen University, 52072 Aachen, Germany

Energies, 2023, vol. 16, issue 22, 1-11

Abstract: This study further investigates the effect of potential on the corrosion resistance, the self-healing performance and the durability of CrN/Cr-coated SS316L bipolar plates with artificial defects (CR-316) in simulated cathodic HT-PEFC environments by means of electrochemical methods. The self-healing ability initiated by oxygen is relatively weak and needs the assistance of the cathode working potential for sealing. In some cases, the defects have spread over large parts of the bipolar plate. The influence of the potential on the corrosion resistance of the bare 316L and CR-316 specimens in the simulated cathodic HT-PEFC environments were investigated by electrochemical impedance spectroscopy. Moreover, the durability of the CR-316 specimens was examined under the various potential cycles in the simulated cathodic environment of HT-PEFC and O 2 atmosphere. After 5000 CV cycles in the potential range of 0.4–1.0 V vs. RHE, the CR-316 specimens could maintain the integrity and good corrosion resistance against the hot phosphoric acid. The results demonstrate the superior performance of CR-316 and make it a prime candidate as a non-precious coating for metallic bipolar plates on the cathode side of HT-PEFCs.

Keywords: corrosion; resistance; HT-PEFC; coating (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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