Abstract
Nanocrystalline transition metal oxides have attracted a great deal of attention due to their good electrochemical activity. To pursue novel active electrode materials with low detection, high sensitivity and good selectivity for the detection of H2O2, Ni foam-supported ZnO nanowires and Co3O4/NiCo2O4 double-shelled nanocages (ZnO/Co3O4/NiCo2O4/Ni foam) have been successful fabricated by facile and effective methods When tested as an enzymatic-free H2O2 electrochemical sensor, the obtained ZnO/Co3O4/NiCo2O4/Ni foam exhibits fast response time within 5 s, low detection limit of 0.163 μM (S/N = 3), high sensitivity of 0.388 mAmM−1 cm−2, wide linear range from 0.2 μM to 2.4 mM (R2 = 0.996), exhibiting good selectivity and long-term stability. The reason is that special structure of the ZnO nanowires could provide direct electrical pathways for the fast electron transport and Co3O4/NiCo2O4 double-shell nanocages provide abundant mesopores and large specific surface area to enhance the catalytic activity of H2O2 detection. These results suggest that the ZnO/Co3O4/NiCo2O4/Ni foam could be considered as a promising electrode material to build electrochemical biosensor.
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