You can use a leachable space-holder material for the introduction of the porosity. In this case the concept would be pretty much the same with any other metallic powder.

I attach a corresponding paper (for Al foams) that might help.

Dear, Dr. Alexander Tsouknidas

thank you so much for your quick response and kind consideration

Dear Mr. Khoshnevisan,

can you maybe give a few more details about the application you are interested in, and the property profile it requires? I think this might help to determine what could be a useful methol to suggest - though the suggestion of Dr. Tsouknidas is definitely a viable possibility, of course.

Kind regards,

Dirk Lehmhus

Dear, Dr. Dirk Lehmhus

thank you for your kind consideration. Actually we fabricated silver metal foam for enzyme immobilization but I couldn't find any papers about that if you can help me in this way I'd really appreciate it.