Nanoporous graphene nanowires and producing methods and applications of same

A method for producing nanoporous graphene nanowires, comprising the steps of:

• dissolving a magnesium compound into water to form a solution having a concentration of magnesium ions in a range of about 0.005-10.0 mol/L, and treating the solution under hydrothermal synthesis to obtain catalysts;
• calcining the catalysts at a temperature in a range of about 100-800° C. to form porous catalyst nanowires;
• introducing a carbon source to a reactor containing the porous catalyst nanowires at a temperature in a range of about 400-1500° C. to grow graphene on the porous catalyst nanowires, thereby forming a composite thereof;
• and
• obtaining porous graphene nanowires from the formed composite.