Co2+　and　H+　co-doped　polyaniline　(PCoH)　was　prepared　by　oxidative　polymerization　and　the　effects　of　Co2+/An　mole　ratio,　type　of　the　proton　acid　and　the　volume　ratio　of　water/ethanol　on　the　morphology　and　electrochemical　properties　of　PCoH　were　also　investigated.　The　results　show　that　the　morphology　of　PCoH　changes　from　the　amorphous　agglomeration　state　to　the　ordered　nano　fiber　structure　with　increase　of　the　mole　ratio　of　Co2+/An.　When　the　proton　acid　is　HCl,　PCoH　has　a　loosely　short　bar　structure　with　the　regular　internal　pore　size　distribution　and　the　best　electrochemical　performance.　The　addition　of　ethanol　in　the　solvent　is　helpful　to　growth　of　the　nano　structure　with　uniform　morphology　during　the　polymerization　and　PCoH　exhibits　excellent　electrochemical　performance.　However,　the　excessive　ethanol　could　increase　the　capacitance　impedance　of　PCoH.　PCoH　has　the　maximum　specific　capacitance　of　374　F/g　with　the　Co2+/An　mole　ratio　of　2:1,　HCl　as　the　proton　acid　and　water/ethanol　volume　ratio　of　1:1,　which　still　retain　85.2%　of　the　initial　specific　capacitance　after　1000　cycles,　and　it　exhibits　good　cycling　stability.　©　2017,　Editorial　Board　of　Polymer　Materials　Science　&　Engineering.　All　right　reserved.