A novel self-powered bioelectrochemical sensor based on CoMn 2 O 4 nanoparticle modified cathode for sensitive and rapid detection of hydrogen peroxide

•A novel self-powered bioelectrochemical sensor was developed for H2O2 detection.•The sensor had a wide liner detection range of 1–1000 mM and fast response time of 5 s.•High sensitivity, low detection limit, good selectivity and stability were observed.•The CoMn2O4@GE cathode showed excellent electrocatalytic activity for H2O2 reduction.