The　N-doped　carbon　materials　have　natural　advantages　as　the　potential　catalyst　of　oxygen　reduction　reaction　(ORR).　However,　the　lack　of　practical　synthesis　techniques　for　enabling　highly　efficient　ORR　performance　hinders　the　go-ahead　of　robust　carbocatalysts.　Here,　we　design　and　synthesize　nitrogen-doped　carbon　nanosheets　(N-CN-Fd)　with　abundant　activate　sites　from　Sterculia　lychnophora　via　a　brief　freeze-drying　technology.　This　universal　route　promotes　the　specific　surface　areas,　strengthens　the　degree　of　graphitization　and　increases　the　atom　ratio　of　electron-donating　groups　of　N-CN-Fd.　The　obtained　N-CN-Fd　displays　an　onset　potential　of　0.91　V,　a　half-wave　potential　of　0.79　V,　and　a　limited-diffusion　current　density　of　3.6　mA/cm(2)　for　ORR　under　alkaline　conditions,　comparable　to　commercial　Pt/　C.　Meanwhile,　a　four-electron　ORR　pathway　is　revealed　and　N-CN-Fd　maintains　higher　stability　than　Pt/C　in　chronoamperometric　response.　Moreover,　the　advantage　of　the　N-CN-Fd　catalyst　in　increasing　the　discharge-charge　capacity　and　improving　the　cycling　stability　of　the　Li-O-2　battery　is　demonstrated.　The　theoretical　calculation　result　illustrates　that　the　abundant　electron-donating　surface　groups　on　the　samples　able　to　accomplish　the　activation　of　ortho-C　atoms,　which　endow　N-CN-Fd　the　excellent　ORR　activity.　Our　findings　provide　guidelines　for　designing　various　carbon-based　electrocatalysts　with　multiple　active　sites　through　freeze-drying　crafts.　(C)　2021　Elsevier　Ltd.　All　rights　reserved.