Patent ID: 7559979

Claim:
A hydrogen separator comprising: a porous substrate having a large number of pores communicating from a first surface to a second surface thereof; and a hydrogen-separating layer disposed on the first surface of the porous substrate in a state that the hydrogen-separating layer has a penetrated portion extending through the pores from the first surface to a particular depth; wherein an average pore diameter at the first surface of the porous substrate whereon the hydrogen-separating layer is disposed is 0.02 to 0.5 μm; wherein a thickness of the hydrogen-separating layer is 1 to 5 μm; wherein the first surface of the porous substrate on which the hydrogen-separating layer is disposed has a surface roughness Ra of 1 μm or less; and wherein a penetration depth of the penetrated portion is 0.05 to 1 μm, is at least equal to the average pore diameter at the first surface of the porous substrate whereon the hydrogen-separating layer is disposed, and is not larger than one half of the thickness of the hydrogen-separating layer.