TEM as shown in the right pic

Precious metal platinum black nanoparticles, due to their nanoscale particle size and structure, have unique mechanical, magnetic, optical and electrical properties, and  widely used in industrial catalysis, biosensing, medical cosmetology fields.
Platinum black nanoparticles, have a series of unusual properties and good catalytic activity. It is an important catalyst material in the automobile industry, used in the catalyst of automobile exhaust purifier and fuel cell catalyst.