ZIF-67 Derived Co3O4/rGO Electrodes for Electrochemical Detection of H2O2 with High Sensitivity and Selectivity
CHEMISTRYSELECT(2016)
摘要
In 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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关键词
Cobalt oxide,Graphene oxide,Hydrogen peroxide detection,ZIF-67
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