File Name : figs1.jpg Caption : fig. s1. tem images of (a) the high energy ball-milling (hebm) black phosphorus (bp) and (b) bp@irgo nanocomposite; high resolution tem images of (c) hebm bp and (d) bp@irgo nanocomposite. File Name : figs2.jpg Caption : fig. s2. ftir spectra of the bp and rgo. File Name : figs3.jpg Caption : fig. s3. galvanostatic charge-discharge profiles of rgo. File Name : figs4.jpg Caption : fig. s4. enlarged eis spectra of the bp and bp@irgo.