Table 2: Potential coating materials for metallic bipolar plates.

Coating Base plate material Reference Aluminum Stainless steel Titanium Nickel Conductive polymer •       [33] Chromium   •     [83] Chromium nitride   •     [84–87] Diamond-like carbon •       [33] Gold •   •   [81, 82] Gold-titanium   •     [88] Gold-nickel   •     [88] Graphite foil •   • • [89] Graphite topcoat • • • • [89] Indium tin oxide •       [90] Lead oxide   •     [90] Nickel   •     [91] Niobium   •     [92] Organic monopolymer •       [33] Platinum     •   [88, 93, 94] Silicon carbide   •     [90] Silver   •     [91] Silver-PTFE   •     [95] Titanium-aluminum •       [90] Titanium nitride oxide   •     [90] Zirconia   •     [96]