Electrochemical determination of hydrogen peroxide by a nonenzymatic catalytically enhanced silver-iron (iii) oxide/polyoxometalate/reduced graphene oxide modified glassy carbon electrode

dc.contributor.authorRoss, Natasha
dc.contributor.authorCivilized Nqakala, Noniko
dc.date.accessioned2021-01-05T09:28:58Z
dc.date.available2021-01-05T09:28:58Z
dc.date.issued2020
dc.description.abstractThe synergism of phosphomolybdic acid hydrate (POM) decorated with silver-iron (III) oxide (Ag-Fe2O3) nanoparticles and anchored on reduced graphene oxide (RGO) have been demonstrated to be effective as a nonenzymatic H2O2 sensor platform. The assembly of the sensor components and their interactions were probed morphologically, spectroscopically and electrochemically. The Ag-Fe2O3/POM/RGO nanocomposite sensor provided an enhanced electroactive surface area, electrical conductivity and sensitivity for hydrogen peroxide compared to an unmodified glassy carbon electrode (GCE) at –0.55 V versus a saturated calomel electrode. The developed sensor amperometric response was linear across the concentration range from 0.3 mM to 3.3 mM (R2 = 0.992) with a detection limit and sensitivity of 0.2 μM and 271 μA·mM‒1·cm−2 respectively. Concomitantly, a short response time of T90 < 5 sec at a signal-to-noise ratio of 4 was achieved. The sensor was shown to determine hydrogen in the presence of interfering species, and exhibited high selectivity with relative standard deviation values less than 4.2%. The results indicate that the use of RGO to anchor and photochemically reduce POM also improved the reduction properties due to the irregular size distribution and catalytic activity of Ag-Fe2O3 stimulated by its adhesion to the distinctive POM/RGO matrix.en_US
dc.identifier.citationRoss, N., & Civilized Nqakala, N. (2020). Electrochemical determination of hydrogen peroxide by a nonenzymatic catalytically enhanced silver-iron (iii) oxide/polyoxometalate/reduced graphene oxide modified glassy carbon electrode. Analytical Letters ,53(15), 2445-2464en_US
dc.identifier.issn1532-236X
dc.identifier.uri10.1080/00032719.2020.1745223
dc.identifier.urihttp://hdl.handle.net/10566/5552
dc.language.isoenen_US
dc.publisherTaylor & Francisen_US
dc.subjectAmperometryen_US
dc.subjectElectrochemistryen_US
dc.subjectElectron-transfer kineticsen_US
dc.subjectNanocompositeen_US
dc.subjectPolyoxometalate (POMen_US
dc.titleElectrochemical determination of hydrogen peroxide by a nonenzymatic catalytically enhanced silver-iron (iii) oxide/polyoxometalate/reduced graphene oxide modified glassy carbon electrodeen_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Electrochemical Determination of Hydrogen Peroxide by a Nonenzymatic Catalytically Enhanced Silver Iron III Oxide Polyoxometalate Reduced Graphene.pdf
Size:
3.76 MB
Format:
Adobe Portable Document Format
Description:
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: