Composite for porous transport layer, sintered body thereof, and method for preparing the same

A porous transport layer comprising a porous sintered body, wherein the porous sintered body comprises a sintered body of a composite for the porous transport layer,

• wherein the composite for the porous transport layer contains:
• a particulate substrate containing at least one selected from a group consisting of an oxide of a first metal and a second metal;
• nanoparticles of a third metal formed on a surface of the particulate substrate,
• wherein the particulate substrate has an average particle diameter of 20 μm to 50 μm,
• wherein the nanoparticles of the third metal have an average particle diameter of 10 nm to 50 nm,
• wherein the particulate substrate and the nanoparticles of a third metal are bound,
• wherein the sintered body of the composite for the porous transport layer comprises necking between the nanoparticles,
• wherein the nanoparticles do not form a separate layer,
• wherein the oxide of the first metal includes cerium (Ce) doped with at least one metal selected from a group consisting of scandium (Sc), yttrium (Y), and a lanthanide, and
• wherein each of the second metal and the third metal independently include titanium (Ti).