Oil–water interfacial synthesis of graphene–polyaniline–MnO2 hybrids using binary oxidant for high performance supercapacitor

• G–P–Mn hybrids are prepared via a facile oil–water interfacial polymerization method.
• A binary oxidant composed of KMnO4 and (NH4)2S2O8 was used for aniline oxidation.
• PANI was nanofibered and MnO2-doped due to interfacial synthesis and binary oxidant.
• The G–P–Mn hybrids exhibit enhanced specific capacitance and good cycling stability.
• It opens a new avenue in designing hybrids in supercapacitor using multiple oxidants.

Graphene–polyaniline–MnO2 (G–P–Mn) hybrids were synthesized via a facile approach that includes the reduction of graphene oxide (GO) to graphene (G) by aniline and then followed by oil–water interfacial polymerization of aniline to polyaniline (PANI) using a binary oxidant of KMnO4 and (NH4)2S2O8. PANI was orderly nanofibered and MnO2-doped due to interfacial polymerization and the use of binary oxidant. The hybrids conclude electrical double layer capacitance of G and pseudo capacitance of PANI and MnO2, showing enhanced specific capacitance of 800.1 F g−1 at 0.4 A g−1 with good cycling stability.

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