A　novel　Ni(OH)(2)/graphene　nanosheets　(GNs)　composite　with　Ni(OH)(2)　nanoflakes　dispersing　within　a　3D　fluffy　and　conductive　graphene　network　has　been　successfully　prepared　by　a　facile　hydrothermal　reaction　for　pseudocapacitor　applications.　Using　the　as-prepared　Ni(OH)(2)/GNs　composite　as　active　material,　the　pseudocapacitor　electrode　exhibits　very　high　capacitance　and　encouraging　rate　capability,　as　indicated　by　the　experimental　results　that　its　specific　capacitance　is　2260　F　g(-1)　at　a　current　density　of　1　A　g(-1)　and　1401　F　g(-1)　when　the　current　density　is　increased　to　10　A　g(-1)　(61.9%　retention).　In　addition,　its　shows　remarkable　long-term　cycling　stability,　with　a　high　capacitance　retention　of　115.6%　at　100　mV　s(-1)　after　4000　cycles　and　only　2.6%　of　decay　at　a　current　density　of　16　A　g(-1)　over　1000　cycles.　The　excellent　electrochemical　performance　of　the　Ni(OH)(2)/GNs　composite　electrode　is　ascribed　to　its　enhanced　ion　and　electron　transport　kinetic　arising　from　its　unique　microstructure,　namely　a　3D　electron　conductive　graphene　network　with　ion　diffusive　fluffy　pathways.　Therefore,　the　Ni(OH)2/GNs　composite　electrode　is　a　promising　candidate　for　high　performance　pseudocapacitors;　the　fluffy　crystalline　GNs　are　promising　matrix　for　advanced　energy　materials　with　ensured　ion　and　electron　conductivities.　(C)　2016　Elsevier　B.V.　All　rights　reserved.