Biosensing Applications of V₂O₅‐CeO₂ Mesoporous Silica

Abstract

Mesoporous silica has been functionalized with vanadium pentoxide (V2O5) and cerium oxide (CeO2). It was then immobilized with biocatalyst horseradish (HRP) to realize highly sensitive detection of H2O2. The electrode was characterized with SEM, cyclic voltammetry, and impedance measurements. A well‐defined peak for HRP reduction was noticed at about −0.31 V with an apparent heterogeneous electron transfer rate constant of 1.01 s−1. The catalytic reduction of H2O2 was achieved. The Michaelis constant was calculated to be 0.018 mM. On this electrode, H2O2 was detectable in the range of 20 to 180 µM and the detection limit was 3.0 µM.

A Review on Metal- and Metal Oxide-Based Nanozymes: Properties, Mechanisms, and Applications

“…with permission sensitivity and selectivity[345]. Up to now, a variety of metaland metal oxide-based nanozymes (e.g., CuO-g-C 3 N 4[346], MnO 2[347], V 2 O 5 -CeO 2[348]) have been exploited for electrochemical analysis. Zhang et al fixed ZIF-8 on graphene…”