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Efficient and portable electrochemical biosensors are received to evaluation of pesticides in the environment, which can make great significance for food safety. In this study, the Co-based oxides with a kind of hierarchical porous hollow and nanocages were constructed, in which the materials (Co3O4-NC) were encapsulated with PdAu Nanoparticles (NPs). Due to the unique porous structure, the changeable valence state of cobalt and the synergistic effect of bimetallic PdAu NPs, PdAu@Co3O4-NC possessed excellent electron pathways, and showed more exposed active sites. Accordingly, the porous Co-based oxides have been applied to construct an activeacetylcholinesterase (AChE) electrochemical biosensor, which showed good performance for organophosphorus pesticides (OPs) detection. The optimum AChE-CS/PdAu@Co3O4-NC/GCE platform allows to exhibit highly sensitive determination of omethoate and chlorpyrifos, with the relative low detection limit of 6.125 × 10-15 M and 5.10 × 10-13 M, respectively. And a wide linear range of 6.125 × 10−15 ~ 6.125 × 10−6 M and 5.10 × 10−13 ~ 5.10 × 10−6 M for these two pesticides were also achieved. Therefore, the PdAu@Co3O4-NC may represent a powerful tool for ultrasensitive sensing of (OPs), and have great potential application.

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