Background: Owing to the strong oxidizing and reducing properties of hydrogen peroxide (H2O2), it has been widely used in many fields. In particular, H2O2 is widely used in the aseptic packaging of drinks and milk. The residue of H2O2 in food is harmful to human health. Therefore, the quantitative detection of H2O2 is of great practical significance.

Methods: The Ag-Au/RGO/TiO2 nanocomposites were facilely synthesized by photo-reduction approach. Transmission electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy were used to characterize the synthesized Ag-Au/RGO/TiO2 nanocomposites. Cyclic voltammetry was used to analyze the electrochemical behavior of H2O2 on the Ag-Au/RGO/TiO2/GCE. Amperometry was applied for quantitative determination of the concentration of H2O2.

Results: A novel Ag-Au/RGO/TiO2/GCE was prepared. The Ag-Au/RGO/TiO2/GCE displayed high electrocatalytic activity towards H2O2 reduction. An electrochemical reduction peak of H2O2 was achieved on the Ag-Au/RGO/TiO2/GCE. The current responses were linear with the concentrations of H2O2 in the range of 0.01-30 mM with the detection limit of 3.0 μM (S/N = 3).

Conclusion: An amperometric sensor has been prepared for H2O2 detection using Ag- Au/RGO/TiO2/GCE. The Ag-Au/RGO/TiO2/GCE shows good performance for the determination of H2O2. The proposed sensor exhibits good selectivity and stability.

背景：由于过氧化氢（H2O2）的强氧化性和还原性，它已被广泛应用于许多领域。特别地，H 2 O 2被广泛用于饮料和牛奶的无菌包装。食物中的H2O2残留物对人体健康有害。因此，定量检测过氧化氢具有重要的现实意义。

方法：采用光还原法简便地合成了Ag-Au / RGO / TiO2纳米复合材料。用透射电子显微镜，X射线光电子能谱和拉曼光谱来表征合成的Ag-Au / RGO / TiO2纳米复合材料。循环伏安法用于分析过氧化氢在Ag-Au / RGO / TiO2 / GCE上的电化学行为。安培法用于定量测定H2O2的浓度。

结果：制备了一种新型的Ag-Au / RGO / TiO2 / GCE。Ag-Au / RGO / TiO2 / GCE对H2O2还原显示出高电催化活性。在Ag-Au / RGO / TiO2 / GCE上实现了H2O2的电化学还原峰。电流响应与H2O2浓度在0.01-30 mM范围内呈线性关系，检出限为3.0μM（S / N = 3）。

结论：已准备了使用Ag-Au / RGO / TiO2 / GCE检测安培传感器来检测H2O2的方法。Ag-Au / RGO / TiO2 / GCE对H2O2的测定具有良好的性能。提出的传感器具有良好的选择性和稳定性。