Patent ID: 8637207

Claim:
A fuel cartridge adapted to connect to a fuel cell comprising: a container having an inner wall and outlet port adapted to connect to a fuel cell; a protective layer provided on the inner wall and containing a polymer or a diamond-like carbon (DLC); and a liquid fuel provided in the container, said liquid fuel containing a cation that is not H + at a concentration falling within a range of 1×10 −7 to 6×10 −6 equivalent/L, said cation being selected from the group consisting of Na + , Al 3+ , Fe 2+ , Ca 2+ , Ni 2+ , K + , Cr 3+ , Mn 2+ , Cu 2+ , Zn 2+ , Co 2+ , Mg 2+ , Sn 2+ , Pb 2+ , Fe 3+ and NH 4 + , wherein said liquid fuel contains said cation at a concentration falling within a range of 1×10 −7 to 1×10 −6 equivalent/L at the outlet port.