Please use this identifier to cite or link to this item: https://cris.library.msu.ac.zw//handle/11408/3295
Title: Electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates
Authors: Shumba, Munyaradzi
Nyokong, Tebello
Keywords: Cobalt tetraaminophenoxy phthalocyanine
Graphene oxide nanosheets
Hydrogen peroxide
Issue Date: 2017
Publisher: Elsevier
Series/Report no.: Electrochimica Acta;Vol. 236: p. 212-220
Abstract: Sulfur and nitrogen affinity for gold is utilized to self-assemble gold nanorods (AuNRs) on S, N doped or S/N co-doped graphene oxide nanosheets (SGONS/AuNRs, NGONS/AuNRs or SNGONS/AuNRs) for enhancement of the electrocatalytic activity of nanosized cobalt tetra aminophenoxy phthalocyanine (complex 1) towards hydrogen peroxide detection. Of the electrodes containing AuNRs, 1-SNGONS/AuNRs-GCE gave the lowest limits of detection (LOD) of 0.012μM followed by 1-SGONS/AuNRs-GCE and 1-AuNRs-SNGONS(seq)-GCE both with LOD of 0.016μM. This work shows that in the absence of GONS (when AuNRs are alone and in the presence of 1 in 1/AuNRs-GCE), unfavorable detection limits are obtained and that doping of GONS is important in improving LOD. 1-SNGONS/AuNRs-GCE showed concentration dependent mechanisms resulting in two adsorption Gibbs energies (ΔGo) of −18.55kJmol−1 and −17.35kJmol−1 at high and low concentrations, respectively.
URI: https://doi.org/10.1016%2Fj.electacta.2017.03.154
http://hdl.handle.net/11408/3295
ISSN: 0013-4686
Appears in Collections:Research Papers

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