Developing electrochemical H2O2 sensors with high sensitivity and selectivity is highly desirable in the food industry. Low-dimensional transition metal oxides are promising in electrochemical sensing due to their attractive characteristics. In this study, leaf-like zeolitic imidazolate framework (ZIF-L) and stick-like zeolitic imidazolate framework (ZIF-S) were used to prepare leaf-shaped L-Co3O4 (L-Co3O4) and stick-shaped Co3O4 (S-Co3O4). The low-dimensional structure could shorten the electron transmission paths and expose more active sites. A series of characterizations were carried out to investigate the morphology and composition of these two materials. Further, the L-Co3O4 and S-Co3O4 were investigated for electrochemical H2O2 detection. The L-Co3O4 showed good electrocatalytic activity toward H2O2 in the ranges of 0.5-4500 and 4500-10000 μM with a detection limit of...

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