Au Nanoparticles@UiO-66 Composite Film-Coated Carbon Cloth Substrate for High-Performance H2O2 Electrochemical Sensing

Anelectrically active Au NPs@UiO-66 composite film wasgrown on three-dimensional carbon cloth (CC) electrodes through anin situ strategy. Due to the unified opening channels in UiO-66, theAu NPs@UiO-66/CC electrode shows excellent selectivity for high-performanceelectrochemical sensing of H2O2 with both highsensitivity and good stability. Due to the strong oxidizability of H2O2,rapid, accurate, sensitive, and stable sensors of hydrogen peroxide(H2O2) have attracted wide attention in thechemical industry, food, medicine, household detergents, and environmentalmonitoring fields. Here, a high-performance H2O2 electrochemical sensing platform is proposed based on an Au nanoparticles@UiO-66film coated on a carbon cloth (CC) electrode (Au NPs@UiO-66/CC electrode).The Au NPs@UiO-66/CC electrode was prepared through solvothermal growthof a UiO-66 film on a functionalized three-dimensional CC electrode,followed by in situ deposition of Au NPs into the UiO-66 film undera periodic galvanostatic pulse current. The in situ preparation strategygreatly improves the electrical interaction between Au NPs@UiO-66and the CC substrate without sacrificing the electrochemical activityof the Au NPs@UiO-66/CC electrode. Meanwhile, thanks to the high specificsurface area of the three-dimensional Au NPs@UiO-66/CC electrode,the optimized Au NPs@UiO-66/CC electrode illustrates excellent electrochemicaldetection capability for H2O2 with an extensivelinear range (0.1-21 mM), high sensitivity (1048.01 & mu;AmM-1 cm(-2)), and lower limit ofdetection [0.033 & mu;M (S/N = 3)] and limit of quantification [0.109 & mu;M (S/N = 3)]. At the same time, the encapsulated structureof Au NPs in the UiO-66 film also endows the composite electrode withspecific sensing performance owing to the regular opening channelsof the UiO-66 films that prevent large-size interferents from reactingto the electrochemically active Au NPs. Together with all these advantages,the proposed sensing platform would exhibit great potential for electrochemicalsensors and bioelectronics.

Automated summary

An electrically active Au NPs@UiO-66 composite film was grown on three-dimensional carbon cloth (CC) electrodes through an in situ strategy. The Au NPs@UiO-66/CC electrode shows excellent selectivity for high-performance electrochemical sensing of H2O2 with both high sensitivity and good stability, due to the unified opening channels in UiO-66. Rapid, accurate, sensitive, and stable sensors of hydrogen peroxide (H2O2) have attracted wide attention in various fields.