Issue 62, 2020, Issue in Progress

Mucilage-capped silver nanoparticles for glucose electrochemical sensing and fuel cell applications

Abstract

A simple, cost-effective and green mucilage-capped silver nanoparticles (Mucilage-AgNPs) modified glassy carbon electrode (GC) composite was constructed for efficient and facile electrochemical oxidation of glucose for the first time. Mucilage-AgNPs were synthesized through the direct chemical reduction of Ag+ by mucilage extracted from Opuntia ficus-indica. Mucilage-AgNPs were identified and characterized using ultraviolet-visible spectroscopy, transmission electron microscopy and square wave voltammetry. Modification of the GC with AgNPs was carried out via a transfer-sticking technique with an immobilization time of 1 h. The Mucilage-AgNPs/GC composite was studied as a possible anode for glucose oxidation in a biofuel cell. The composite resulted in glucose oxidation with a current density and power density of 85.7 μA cm−2 and 25.7 μW cm−2, respectively. Glucose sensing using the Mucilage-AgNPs/GC composite was achieved successfully via two pathways: glucose oxidation and AgNP inhibition. The glucose oxidation-based sensor showed a lower detection limit of 0.01 mM and a linear range of 0.01 to 2.2 mM. The AgNPs inhibition-based sensor provides an indirect determination pathway of glucose with a detection limit of 0.1 mM and a linear range of 0.1 to 1.9 mM. AgNP inhibition is a novel pathway that could be used for determining a large number of organic and inorganic molecules. Overall, the Mucilage-AgNPs/GC is considered a pioneering composite for glucose sensing and fuel cell applications.

Graphical abstract: Mucilage-capped silver nanoparticles for glucose electrochemical sensing and fuel cell applications

Supplementary files

Article information

Article type
Paper
Submitted
27 Aug 2020
Accepted
30 Sep 2020
First published
14 Oct 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 37675-37682

Mucilage-capped silver nanoparticles for glucose electrochemical sensing and fuel cell applications

Z. Khalifa, M. Zahran, M. A-H Zahran and M. A. Azzem, RSC Adv., 2020, 10, 37675 DOI: 10.1039/D0RA07359H

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