Biosensing Applications of V2O5‐CeO2 Mesoporous Silica. Issue 9 (30th June 2015)

• Record Type: Journal Article
• Authors: Luo, Xi; Shu, Hao; Wan, Qijin; Wang, Zhaohao; Yang, Nianjun
• Is Part Of: Electroanalysis. Volume 27:Issue 9(2015:Sep.)
• Page Start: 2194
• Page End: 2200
• Publication Date: 2015-06-30
• Subjects: Electrochemical analysis -- Periodicals; Chemistry, Analytical -- Periodicals; Electrochemistry -- Periodicals; 543.4
• DOI: 10.1002/elan.201500250
• Languages: English
• ISSNs: 1040-0397

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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.</p> </abstract>