The　ternary　MnCoNi　layered　double　hydroxides　(MnCoNi-LDH)　used　in　supercapacitors　frequently　encounters　issues　in　low　electronic　conductivity　and　big　volume　expansion　throughout　charge–discharge,　which　compromise　cycling　stability.　Herein,　MnCoNi-LDH　is　effectively　produced　via　the　straightforward　one-pot　hydrothermal　method　with　ZIF-67　as　the　template,　which　delivers　an　ultrahigh　specific　capacitance　performance　of　2254　F　g−1　at　a　current　density　of　1　A/g.　More　importantly,　the　capacitance　lost　is　only　8.47　%　after　5000　cycles　at　10　A/g.　The　fabricated　MnCoNi-LDH　consists　of　the　hollow　polyhedral　nanostructure　with　interior　nanoporous　channels　and　nanosheet　on　the　surface,　which　supply　high　specific　areas　and　a　huge　quantity　of　redox　active　sites.　It　is　found　the　exceptional　performance　of　ternary　MnCoNi-LDH　is　related　to　its　distinctive　nanostructure,　the　synergy　effect　among　metal　ions　and　the　enhanced　ion　transmission　speed　and　the　conductivity.　Additionally,　when　the　ternary　MnCoNi-LDH　is　employed　in　a　flexible　solid-state　hybrid　supercapacitor,　the　device　has　an　excellent　specific　capacitance　of　303.08　mF　cm−2　at　a　current　density　of　1　mA　cm−2,　a　high　energy　density　of　47.42　Wh　kg−1　at　a　power　density　of　404.1　W　kg−1　and　retains　96.3　%　of　capacitance　after　5000　cycles.　©　2022　Elsevier　B.V.