Three-dimensional Co₃O₄@MWNTs nanocomposite with enhanced electrochemical performance for nonenzymatic glucose biosensors and biofuel cells

Abstract

Three-dimensional nanoarchitectures of Co3O4@multi-walled carbon nanotubes (Co3O4@MWNTs) were synthesized via a one-step process with hydrothermal growth of Co3O4 nanoparticles onto MWNTs. The structure and morphology of the Co3O4@MWNTs were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, scanning electron microscopy and transmission electron microscopy. The electrocatalytic mechanism of the Co3O4@MWNTs was studied by X-ray photoelectron spectroscopy and cyclic voltammetry. Co3O4@MWNTs exhibited high electrocatalytic activity towards glucose oxidation in alkaline medium and could be used in nonenzymatic electrochemical devices for glucose oxidation. The open circuit voltage of the nonenzymatic glucose/O2 fuel cell was 0.68 V, with a maximum power density of 0.22 mW cm−2 at 0.30 V. The excellent electrochemical properties, low cost, and facile preparation of Co3O4@MWNTs demonstrate the potential of strongly coupled oxide/nanocarbon hybrid as effective electrocatalyst in glucose fuel cells and biosensors.

Development of Pd@MWCNT-Co3O4 Electrode Sensors Using Cobalt Recovered from Spent Lithium Ion Batteries

“…The marginal potential shift observed with respect to glucose addition reveals that the sensing capacity was better with respect to the modified electrode. A comparison of the cyclic voltammetric behavior of the Co 3 O 4 electrode and Pd@MWCNT-Co 3 O 4 electrode in the absence and in the presence of the analyte glucose is shown in [52][53][54] But the excellent electron transfer ability of Pd-MWCNT and the electrocatalytic nature of cobalt oxide improved the sensing behavior towards glucose with respect to the Pd@MWCNT-Co 3 O 4 electrode. Due to the excellent electrical property of the Pd@MWCNT-Co 3 O 4 electrode, the electron transfer process was superior that accelerate the reaction sequence which improved the sensitivity of the modified electrode for glucose detection.…”

Reusable, Non-Invasive, and Ultrafast Radio Frequency Biosensor Based on Optimized Integrated Passive Device Fabrication Process for Quantitative Detection of Glucose Levels

“…However, the introduction of some small molecule exotic vectors acting as channels between enzymes and motors electrodes leads to a slowing reaction, a decreasing performance, a deteriorating reliability and frequent replacement. Moreover, another key factor limiting the application of electrochemical sensors is the fact that the electrolytes need to be replenished on a regular basis, which significantly increase burden to subsequent costs [30][31][32]. With regard to optical biosensors, it needs a long settling time for detection and is highly susceptible to change the test results for ambient light [33][34][35][36][37][38][39][40][41].…”

Glucose Oxidase-like Rhodium Single-Atom Nanozymes: A Mimic Platform for Biometabolism and Electrometabolism of Glucose Oxidation at Neutral pH

“…4,5 In this regard, it is practical and of universal significance to promote the effective electrooxidation of glucose by constructing glucose fuel cells. Generally speaking, there are three kinds of feasible anodic catalysts to achieve glucose electrooxidation in fuel cells: (1) noble/transition metal-based metal catalysts (with Pd, Pt, Au, Ni, and their alloys) 6−8 or transition metal oxides (e.g., ZnO and Co 3 O 4 ); 9,10 (2) metal porphyrin-based molecule catalysts, such as deuteroporphyrin dimethylester rhodium(III) ((DPDE)Rh III ) 11 or pyrene-modified metalloporphyrins; 12,13 and (3) redox enzyme-based biocatalysts using, for example, glucose oxidase (GOD) 14,15 or glucose dehydrogenase (GDH). 16,17 Due to the slow reaction kinetics in neutral solutions, the first two kinds of catalysts are frequently used under alkaline, high-temperature, and membranous conditions.…”

“…Glucose possesses a high chemical energy (4430 Wh kg –1 ), and the direct conversion of that chemical energy into electrical energy is highly eco-friendly, without releasing any pollution. , In this regard, it is practical and of universal significance to promote the effective electrooxidation of glucose by constructing glucose fuel cells. Generally speaking, there are three kinds of feasible anodic catalysts to achieve glucose electrooxidation in fuel cells: (1) noble/transition metal-based metal catalysts (with Pd, Pt, Au, Ni, and their alloys) − or transition metal oxides (e.g., ZnO and Co 3 O 4 ); , (2) metal porphyrin-based molecule catalysts, such as deutero­porphyrin dimethyl­ester rhodium­(III) ((DPDE)­Rh III ) or pyrene-modified metallo­porphyrins; , and (3) redox enzyme-based biocatalysts using, for example, glucose oxidase (GOD) , or glucose dehydrogenase (GDH). , Due to the slow reaction kinetics in neutral solutions, the first two kinds of catalysts are frequently used under alkaline, high-temperature, and membranous conditions. Compared with them, redox enzymes are more compatible with the urgent pursuit of biological and physiological applications (i.e., powering implantable and wearable devices by glucose or lactate in the body).…”