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.

耐腐蚀性和表面导电性的缺点是限制钛双极板在质子交换膜燃料电池（PEMFC）中广泛应用的主要缺陷。通过等离子表面改性技术，在Ti板表面制备了NbC改性层，以改善双极板的性能。NbC改性层具有致密，连续的微观结构，并且与基材的界面粘结良好。在模拟的PEMFC环境（0.5 MH ₂ SO ₄）中研究了NbC-Ti双极板的电化学特性 + 3 ppm HF溶液，温度为75°C）。NbC改性双极板在阳极和阴极电势上显示出更高的正腐蚀电势和更低的电流密度。NbC-Ti双极板的界面接触电阻（ICR）在140 N cm ^-2的压紧力下显示出16.6mΩcm ²的低值，低于裸Ti板（91.9mΩcm ²）。此外，NbC改性双极板的ICR仅在阳极和阴极环境中经过4 h恒电位测试后才显示出轻微的增加。因此，NbC改性的Ti双极板可以作为PEMFC的候选电源。