Polyaniline　(PANI)/reduced　graphene　oxide　(rGO)　composites　were　synthesized　by　in　situ　oxidative　polymerization　of　aniline　on　reduced　graphene　sheets.　Fourier　transform　infrared　spectroscopy,　X-ray　diffraction,　thermogravimetric　analysis,　transmission　electron　microscopy,　and　scanning　electron　microscopy　were　used　to　characterize　the　composites.　The　results　indicated　PANI/rGO　composites　were　produced　and　contained　covalent　bonds　between　the　functional　groups　of　PANI　and　rGO.　A　uniform　coating　of　PANI　on　the　rGO　sheets　had　a　synergistic　effect　on　the　properties　of　the　composites.　The　electrochemical　properties　of　the　PANI/rGO　composites　produced　using　different　feed　ratios　of　aniline　to　rGO　were　studied.　The　results　showed　that　the　composites　exhibited　a　maximum　specific　capacitance　of　797.5　F/g　at　0.5　A/g　and　minimum　charge　transfer　resistance　of　0.98　when　the　feed　ratio　of　aniline　to　rGO　was　2:1.　These　values　were　superior　to　those　of　pure　PANI　and　rGO.　The　composites　also　displayed　excellent　cycling　stability,　with　specific　capacitance　retention　of　92.43%　after　1000　cycles.　These　stable　structural　composites　show　promise　for　the　development　of　new　supercapacitor　applications.　(c)　2018　Wiley　Periodicals,　Inc.　J.　Appl.　Polym.　Sci.　2018,　135,　46103.