Low-cost　catalysts　with　high　performance　toward　the　oxygen　reduction　reaction　(ORR)　in　energy　conversion　systems　are　intensively　desired.　Here,　we　report　the　preparation　of　a　composite　catalyst　that　is　composed　of　pyrrole-doped　carbon　black　(py-CB)　and　Co3O4　nanoparticles　(NPs).　The　synergetic　effect　of　Co3O4　and　pyrrole　on　CB　particles　endows　the　obtained　py-CB/Co3O4　hybrid　with　pronounced　catalytic　activity　toward　the　ORR.　The　onset　potential　of　the　hybrid　is　0.88　V　vs.　RHE　and　the　half-wave　potential　is　only　60　mV　negative　from　that　of　the　commercial　Pt/C　catalyst.　The　diffusion-limit　current　density　of　this　catalyst　reaches　5.47　mAcm　(-2),　which　is　very　close　to　that　of　Pt/C.　The　electron-transfer　number　of　ORR　on　the　py-CB/Co3O4　is　3.9,　indicating　a　desirable　four-electron　reduction　pathway.　Moreover,　the　hybrid　catalyst　exhibits　a　much　higher　durability　toward　the　ORR　than　the　commercial　Pt/C　catalyst.　The　py-CB/　Co3O4　composite　catalyst　is　highly　competitive　compared　to　other　carbon-based　catalysts,　owing　to　its　high　activity,　excellent　stability,　and　especially　the　use　of　inexpensive　CB　and　the　ease　of　preparation.　This　work　may　open　a　new　avenue　for　the　design　and　preparation　of　ORR　catalysts　based　on　cheap　and　commercially　available　CB.