Abstract
The drawback of corrosion resistance and surface conductivity is the main deficiency to restrict the widespread application of Ti bipolar plate in proton exchange membrane fuel cell (PEMFC). A NbC modified layer has been prepared on the surface of Ti plate by plasma surface modification technology to improve the performance of bipolar plate. The NbC modified layer possesses dense, continuous microstructure and exhibits well interface bonding with substrate. The electrochemical characteristic of NbC-Ti bipolar plate is investigated in simulated PEMFC environment (0.5 M H2SO4 + 3 ppm HF solution at 75 °C). The NbC modified bipolar plate exhibits more positive corrosion potential and lower current density at anode and cathode potential. The interfacial contact resistance (ICR) of NbC-Ti bipolar plate shows a low value of 16.6 mΩ cm2 at compaction force of 140 N cm−2, lower than that of bare Ti plate (91.9 mΩ cm2). In addition, the ICR of NbC modified bipolar plate only exhibits slight increase after potentiostatic test of 4 h in both anode and cathode environment. Thus, the NbC modified Ti bipolar plate can act as candidate supplies for PEMFC.
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