Amperometric detection of hydrogen peroxide and its density functional theory for adsorption on Ag/TiO2 nanohybrid

• Published in: Journal of materials science. Materials in electronics Vol. 31; no. 8; pp. 6017 - 6026
• Main Authors: Lim, Su Pei, Shahid, M. M., Rameshkumar, Perumal, Huang, Nay Ming, Che, Liming
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2020; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemical reduction; Chemical synthesis; Chemistry and Materials Science; Density functional theory; Electrical measurement; Electron transfer; Hydrogen peroxide; Image transmission; Materials Science; Nanocomposites; Nanoparticles; Optical and Electronic Materials; Selectivity; Silver; Titanium dioxide
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-03153-9

Silver/titania (Ag/TiO 2 ) nanocomposites, synthesized through a simple one-step chemical reduction method, are used for electrochemical sensing of hydrogen peroxide (H 2 O 2 ). The images of transmission electron microscopic (TEM) demonstrate a well dispersion of Ag nanoparticles (NPs) with a particle size range of approximately 3 nm on the TiO 2 surface, which makes the sensor based on Ag/TiO 2 exhibit an excellent performance toward H 2 O 2. The AgNPs presented in the nanocomposite exhibit electrocatalytic reduction of H 2 O 2 and the limit of detection (LOD) is found to be 1.23 µM. Density functional theory (DFT) calculation studies reveal that H 2 O 2 could be easily adsorbed onto Ag rather than TiO 2 surface of Ag/TiO 2 via a partial electron transfer from Ag to H 2 O 2 . The nanocomposite-modified electrode has also excellent selectivity toward the detection of H 2 O 2 over the interferents even when the interferents have a 100 times higher concentration than H 2 O 2.