A covalently linked dual network structure achieved by rapid grafting of poly(p-phenylenediamine)-phosphomolybdic acid on reduced graphene oxide aerogel for improving the performance of supercapacitors.

Covalent grafting of poly(p-phenylenediamine) (PPD)-phosphomolybdic acid (PMo12) on rGO (PPD-PMo12@rGO) has been realized within 1 minute. PPD-PMo12@rGO shows a characteristic covalently linked dual network structure that can siginificantly enhance its specific capacitance and cycling stability for supercapacitors.