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Nitrogen plasma-implanted titanium as bipolar plates in polymer electrolyte membrane fuel cells |
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| Authors: | Kai Feng Dixon T.K. Kwok Zhuguo Li Paul K. Chu |
| Affiliation: | a Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road 800#, Minhang, Shanghai 200240, China b Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China c School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
| Abstract: | Nitrogen plasma immersion ion implantation (PIII), a non-line-of-sight surface treatment technique suitable for bipolar plates in polymer electrolyte membrane fuel cells, is conducted at low and high temperature to improve the corrosion resistance and conductivity of titanium sheets. X-ray photoelectron spectroscopy (XPS) shows that high-temperature (HT) nitrogen PIII produces a thick oxy-nitride layer on the titanium surface. This layer which provides good corrosion resistance and high electrical conductivity as verified by electrochemical tests, inductively coupled plasma optical emission spectroscopy, and interfacial contact resistance (ICR) measurements renders the materials suitable for polymer electrolyte membrane fuel cells. In comparison, the low-temperature (LT) PIII titanium sample exhibits poorer corrosion resistance and electrical conductivity than the untreated titanium control. |
| Keywords: | Bipolar plate Polymer electrolyte membrane fuel cells Plasma immersion ion implantation Corrosion resistance Titanium |
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