Carbon nanofiber with skin-core structure, method of producing the same, and products comprising the same

A method of producing a carbon nanofiber, the method comprising:

• dissolving polyacrylonitrile in a first solvent, thus preparing a first spinning solution;
• dissolving in a second solvent pitch having a molecular weight such that phase separation ensues upon blending with the polyacrylonitrile, thus preparing a second spinning solution;
• blending the first spinning solution with the second spinning solution, thus preparing a third spinning solution;
• electrospinning the third spinning solution, thus preparing a carbon nanofiber precursor;
• and
• stabilizing the carbon nanofiber precursor, thus obtaining a flame-resistant fiber.