Abstract：The detection of H2O2 content by electrochemical sensor method has many advantages and there have been many reports. However, the sensitivity and the limit of detection should be further improved because they are affected by the morphology of nanomaterials and the construction method of sensing interface. The silver (I)-terephthalate metal-organic frameworks (Ag-MOFs) were synthesized by the hydrothermal method.In order to improve the analytical performance of sensor, the gold nanoparticles (AuNPs) were loaded on the surface of Ag-MOFs, AuNPs/Ag-MOFs were synthesized, thus a novel enzyme-free H2O2 electrochemical sensor was constructed. The transmission electron microscope (TEM) characterizations indicated that Ag-MOFs were rod-shaped with length of 400-600nm. The performance of electrochemical sensor was measured by the electrochemical methods including cyclic voltammetry and amperometry. It was found that the constructed electrochemical sensor exhibited excellent catalytic performance on the reduction of H2O2. The catalytic current was linear to the concentration of H2O2 in range of 0.6μmol/L to 18.5mmol/L. The sensitivity was up to 219.5μA·(mmol/L)-1·cm-2 and the limit of detection was 0.3μmol/L (S/N=3). Three disinfectant samples were tested. The sample solution was firstly diluted before experiments. Then the concentration of H2O2 was determined by electrochemical sensor. The relative standard deviations (RSD, n=6) of results were less than 4%. The found results were basically consistent with those obtained by KMnO4 titration method.
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