PRECURSOR SHEET FOR FUEL CELL SEPARATOR, AND FUEL CELL SEPARATOR

    公开(公告)号:EP4270552A1

    公开(公告)日:2023-11-01

    申请号:EP22910782.6

    申请日:2022-11-30

    摘要: This precursor sheet for a fuel cell separator comprises a conductive substrate sheet, a dense layer including first graphite particles, and a conduction layer including second graphite particles, wherein the dense layer and the conduction layer include a resin, the first graphite particles have a volume resistivity of 20 mΩ·cm or greater and a bulk density of 1.7 g/cm 3 or greater when compressed at 30 MPa, and the second graphite particles have a volume resistivity of less than 20 mΩ·cm and a bulk density of 1.5 g/cm 3 or greater when compressed at 30 MPa. This precursor sheet for a fuel cell separator provides a fuel cell separator that has excellent shapability and good mechanical strength, conductivity, and gas impermeability.

    STAINLESS STEEL FOR FUEL CELL SEPARATOR HAVING EXCELLENT THROUGH-PLANE ELECTRICAL CONDUCTIVITY AND CORROSION RESISTANCE AND METHOD FOR MANUFACTURING SAME

    公开(公告)号:EP4261957A1

    公开(公告)日:2023-10-18

    申请号:EP21903834.6

    申请日:2021-12-08

    申请人: POSCO Co., Ltd

    摘要: This specification discloses a stainless steel for a fuel cell separator with excellent through-plane electrical conductivity and corrosion resistance. Disclosed a stainless steel for a fuel cell separator with excellent through-plane electrical conductivity and corrosion resistance, when the surface of stainless steel containing 15% or more of Cr by weight is measured by X-ray angle-resolved photoelectron spectroscopy using an Al-Kα X-ray source under the condition that the photoelectron take-off angle is 12°, following surface oxide element ratio (1) value may be 0.5 to 5, and following surface oxide element ratio (2) value may be 0.5 or less: Sum of atomic concentrations at % of Cr elements in Cr oxides and Cr hydroxides Sum of atomic concentrations at % of Fe elements in Fe oxides and Fe hydroxides Sum of atomic concentration at % of metal element in the metal oxide MO Sum of atomic concentration at % of metal elements in all oxides and hydroxides
    wherein Cr oxides mean Cr 3 O 4 , Cr 2 O 3 , CrO 2 or CrO 3 Cr hydroxides mean CrOOH, Cr(OH) 2 or Cr(OH) 3 , and Fe oxides mean FeO, Fe 2 O 3 or Fe 3 O 4 , and Fe hydroxides mean FeOOH,
    wherein the total oxides and hydroxides comprise the Cr oxides, the Cr hydroxides, the Fe oxides, the Fe hydroxides, and metal oxides(MO), and the metal oxides(MO) comprise mixed oxides, and M is Ti, Nb, Mn, Si, V or a combination thereof excluding Cr and Fe, and O means oxygen.