Cosmetic Hydrogen Peroxide Detection Using Nano Bismuth Species Deposited Built-in Three-in-One Screen-Printed Silver Electrode

摘要

A built-in three-in-one screen-printed electrode assembly containing nano bismuth species depositedsilver as working, pre-oxidized silver as reference and unmodified silver as counter electrodesnano (designated as SPAgE-Bi ), has been developed for simple electrochemical sensing of H2O2 in pH 7phosphate buffer solution. The working electrode showed ~250 mV reduction in over-potential and atwo-fold increased peak current values for electrocatalytic reduction of H2O2 over the respectiveunmodified silver working electrode (i.e. SPAgE) following a diffusion-controlled electron-transfermechanism. 50 nm sized Bi particles on SPAgE surface was seen in SEM picture of the workingelectrode. Linear range of H2O2 detection from 100 M to 5 mM, a sensitivity of 0.627 A /mM andnano detection limit (S/N = 3) of 56.59 M were obtained. Finally, SPAgE-Bi sensor assembly wasutilized for cosmetic H2O2 determination, where obtained values and labeled values were in goodagreement with recovery in the range of 94.7501.03 %.