Preparation and performances of modified Ti4O7 doped polypyrrole coating for metallic bipolar plates

In view of the high chemical stability and good electrical conductivity of Ti4O7 particles, it is proposed in this work to develop Ti4O7 doped polypyrrole coatings on 316 L metallic bipolar plates by electrodeposition technique. Thereby, the conductive Ti4O7 particles are prepared and hydroxylated. Then the modified Ti4O7 particles are chemically bonded with sulfur-containing doped acid, and combined with polypyrrole chain through electrostatic interaction. The composite coating can keep high chemical stability in simulated cathodic proton exchange membrane fuel cells environment at 25 and 70 degrees C. Meanwhile, the electrical conductivity and hydrophobicity are also significantly enhanced.

Automated summary

This study developed Ti4O7 doped polypyrrole coatings on metallic bipolar plates using electrodeposition technique, which showed high chemical stability and good electrical conductivity.