Conductive, anti-corrosive material
AssigneeRobert Bosch GmbH
InventorsSoo Kim, Lei Cheng, Georgy Samsonidze, Mordechai Kornbluth, Jonathan Mailoa, Sondra Hellstrom, Boris Kozinsky, Nathan Craig
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Abstract
A proton-exchange-membrane fuel cell bipolar plate includes a metal substrate having a bulk portion and a surface portion including an anticorrosive, conductive binary phosphide material having a formula (I): AxPy (I), where A is an alkali metal, alkaline earth metal, transition metal, post-transition metal, or metalloid, x, y is each a number independently selected from 1 to 15, and the binary phosphide material is configured to impart anticorrosive and conductive properties to the metal substrate.
Claims20
A proton-exchange-membrane fuel cell bipolar plate comprising:
- a metal substrate having a bulk portion and a surface portion comprising an anticorrosive, conductive binary phosphide material having a formula (I):
- AxPy (I),
- where A is V, Cr, Ni, Zr, Nb, Mo, or Sn;
- and x and y are each a number independently selected from 1 to 15, and the binary phosphide material being configured to impart anticorrosive and conductive properties to the metal substrate.
A proton-exchange-membrane fuel cell bipolar plate comprising:
- a metal substrate having a bulk portion and a surface portion including an anticorrosive, conductive ternary phosphide material having a formula (II):
- AxBzPy (II),
- where A and B are each V, Cr, Ni, Zr, Nb, Mo, or Sn;
- x, y, and z are each a number independently selected from 1 to 15, and the material being configured to impart anticorrosive and conductive properties to the substrate.
An anticorrosive and conductive substrate comprising:
- a bulk portion;
- and
- a surface portion material including a binary phosphide, ternary phosphide, or both having formulas (I) and (II):
- AxPy (I),
- AxBzPy (II),
- where A and B are each V, Cr, Ni, Zr, Nb, Mo, or Sn;
- and x, y, and z are each a number independently selected from 1 to 15, such that the surface portion material is configured to impart corrosion resistance of less than 10 μA cm−2 at about 80° C., at pH of 2-3, with the presence of 0.1 ppm of HF in the solution and electrical conductivity greater than about 100 S cm−1 to the substrate.
Dependencies are inferred from the claim text.