Abstract
AbstractIn this work, zeolitic imidazolate framework (ZIF) nanocrystal arrays were supported by graphene oxide (GO) nanosheets by a graphene assembly route. Then, ZIF‐67/GO was transformed into nanoporous Co3O4/rGO composites through calcination. Both ZIF‐67/GO and Co3O4/rGO were employed as active materials to modify glass carbon electrodes for hydrogen peroxide (H2O2) non‐enzymatic sensor. The measurement results indicate that ZIF‐67/GO presented excellent electro‐catalytic activity towards H2O2 with a linear range of 0.1‐22.9 mM and a low detection limit of 1.92 mM. More important, the Co3O4/rGO modified GC electrode showed higher detection sensitivity for H2O2 and the limit of detection can be as low as 7.87 nM. Furthermore, ZIF‐67/GO and Co3O4/rGO modified electrodes both exhibited excellent selectivity in phosphate buffer solution and NaOH.
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