Co/CoO nanoparticles armored by N-doped nanoporous carbon polyhedrons towards glucose oxidation in high-performance non-enzymatic sensors

Abstract

Glucose determination with high sensitivity is crucial in human serum and food products. Herein, the Co/CoO nanoparticles attached on the outer shell and inner core of porous N-doped carbon polyhedrons...

In situ growth of the CoO nanoneedle array on a 3D nickel foam toward a high-performance glucose sensor

“…Therefore, as the glucose concentration increases, the occupation of the active sites of the sensing electrode by the reaction intermediates will affect its sensitivity, which is very common in non-enzymatic glucose sensing. [48][49][50] A long-term stability for the CoO-400 electrode after glucose sensing is measured. The results show that the current density response toward 0.01 mM glucose for the electrode remains 95.4% and 93.8% of the initial current density response after exposing in air for 4 days and a week, respectively, indicating that good long-term stability can be achieved for the CoO-400 electrode after glucose sensing (Fig.…”

“…For cobalt-based sensors, Co(II)/Co(IV) is usually considered as the active center of glucose oxidation. 49,51 As shown in Fig. 5, Co(II) was oxidized to form Co(IV) by a reversible reaction at the anode under OH − conditions (formula (1) and ( 2)).…”

Enhanced photocatalytic activity in ZnO nanoparticles developed using novel Lepidagathis ananthapuramensis leaf extract

“…Over the last decade, various metal oxides such as ZnO, 1–3 CuO, 4 NiO, 5 CoO, 6 Fe 2 O 3 , 7 MnO 2 , 8 TiO 2 , 9,10 SnO 2 , 11 MgO, 12 etc have been synthesised for numerous applications, among which photocatalytic applications and waste water treatment have been explored enormously. Among various metal oxides, ZnO and TiO 2 NPs are studied the most due to their non-toxic nature, cost effectiveness, chemical stability and inertness, eco-friendliness, potential photocatalytic efficiency, etc.…”

“…etc for synthesising metal oxide NPs. [1][2][3][4][5][6][7][8][9][10][11][12] But these methods fail to address the problems related to toxicity, cost, waste production and environmental contamination. In order to overcome them, today's researchers have been immensely focusing on the green chemistry route for synthesizing metal oxides.…”

Hierarchical and ultra-porous copper cobaltite flakes with honeycomb-like physiognomies for highly efficient non-enzymatic glucose sensing

“…The enzyme mobilising and promoting efficiency of the substrate is measured by converting glucose to gluconolactone and carefully estimating the by-product H 2 O 2 . 3 Since enzymes are highly selective species, GOx-based glucose sensors exhibit outstanding selectivity and sensitivity when used directly under physiological conditions such as in the bloodstream (at a pH of ∼7.35–7.45). Despite these advantages, the broad commercialization of enzyme-based glucose sensors for the detection of glucose is hindered by its high cost as well as its unsatisfactory inherent stability in the presence of interfering chemicals, high pH, and humidity conditions.…”