Nickel‐Foam‐Supported Co₃O₄ Nanosheets/PPy Nanowire Heterostructure for Non‐enzymatic Glucose Sensing

Abstract

Cobalt oxide nanosheets (Co 3 O 4 NSs)/polypyrrole nanowire (PPy NW) core-shell nano-heterostructures based on nickel foam (NF) were fabricated for electrochemical non-enzymatic glucose determination. The Co 3 O 4 /PPy nanostructures grew directly on nickel foam substrate by electrochemical deposition processes. The PPy NW core and the Co 3 O 4 NS shell constructed the hierarchical nanocomposites to form a three dimensional microÀnanostructure in the micropores of NF. The as-prepared Co 3 O 4 /PPy/NF heterostructures were characterized by using scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The introduction of the Co 3 O 4 NSs can provide a high surface area and lead to high sensitivity to glucose. Chronoamperometry was used to evaluate the sensitivity of the sensor toward glucose. Compared with NF, PPy/NF, and Co(OH) 2 /PPy/NF electrodes, the Co 3 O 4 /PPy/ NF electrode exhibited higher electrocatalytic activity for the oxidation of glucose, and the proposed glucose sensor showed linear electrochemical responses to glucose with a low detection limit of 0.74 mM (S/N = 3). In addition, the prepared biosensor revealed good selectivity in the presence of electroactive species such as d-fructose, uric acid, ascorbic acid and hydrogen peroxide, and provided an excellent platform for the determination of glucose in human urine samples.

Hierarchical MnCo2O4/NiMn Layered Double Hydroxide Composite Nanosheet Arrays on Nickel Foam for Enhanced Electrochemical Storage in Supercapacitors

“…Figure c shows the high‐resolution Mn 2p spectrum, where the two deconvoluted peaks at 641.3 and 653.4 eV were attributed to Mn 2+ , while the other two deconvoluted peaks at 643.2 and 654.7 eV were attributed to Mn 3+ ,. The high‐resolution Co 2p spectrum in Figure d shows the co‐existence of Co 2+ and Co 3+ , which were accordingly derived from the two deconvoluted peaks at 781.7 and 796.4 eV, and another two deconvoluted peaks at 779.5 and 794.4 eV, respectively ,…”

Metal–Organic Framework‐Derived Nickel/Cobalt‐Based Nanohybrids for Sensing Non‐Enzymatic Glucose

“…However, daily monitoring of human blood glucose levels can improve both the quality of life of diabetic patients and treatment efficiency. [8][9][10] Over the past few decades, a wide variety of methods for detecting glucose content have been reported. These include gas/liquid chromatography, fluorescence, electrochemistry, and capillary electrophoresis.…”

“…Diabetes is a chronic incurable disease. However, daily monitoring of human blood glucose levels can improve both the quality of life of diabetic patients and treatment efficiency [8–10] …”

A yolk–albumen–shell structure of mixed Ni–Co oxide with an ultrathin carbon shell for high-sensitivity glucose sensors

“…[7][8][9] Among these transition metals, Co and Ni show superior electrocatalytic activity and high stability toward electro-oxidation of glucose in alkaline media. [10][11][12][13] In order to increase the electrocatalytic active surface area of these active materials, different kinds of nanostructures have been used for glucose electrocatalysis, such as nanowires, 13 nanosheets, 14 nanodisks, nanorods, 15 nanotubes, 16 nanoflowers 17 and so on. However, the poor electrical conductivity of these metal oxides and their tendency to aggregate has hindered their applications.…”