An Ultrahigh Performance Enzyme‐Free Electrochemical H2O2 Sensor Based on Carbon Nanopores Encapsulated Ultrasmall Cobalt Oxide Nanoparticles. Issue 40 (26th October 2021)

• Record Type: Journal Article
• Authors: Yan, Tingting; Chen, Qian; Wang, Yi; Long, Yan; Jiang, Yanshu; Fan, Guangyin
• Is Part Of: ChemistrySelect. Volume 6:Issue 40(2021)
• Page Start: 11121
• Page End: 11129
• Publication Date: 2021-10-26
• Subjects: Cobalt oxide -- Electrochemistry -- Enzyme-free sensing -- Hydrogen peroxide -- Porous carbon -- Sensors.; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202101886
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Small metal oxide nanoparticles (NPs) that possess abundant accessible active areas and optimal geometric/electronic structures show great promise in electrochemical detection of hydrogen peroxide (H2 O2 ) but remain a synthetic challenge. Herein, a simple adsorption‐annealing synthetic strategy is employed for ultrasmall Co3 O4 NPs using the confinement of carbon nanopores in porous carbon (PC). The characterization results indicate that Co3 O4 NPs with an ultrafine diameter of 3.01 nm are well distributed on PC (Co3 O4 /PC−H) with high density because of the carbon nanopore confinement of the support. The achieved Co3 O4 /PC−H can be used as an excellent electrocatalyst for H2 O2 detection, with a high sensitivity of 332 μA mM −1 cm −2, a low detection limit of 1.2 μM, and an excellent linear detection ranges from 0.04 to 20 mM. This catalyst can also be employed for sensing H2 O2 in real samples. The large specific surface area and unique morphology and structure of Co3 O4 /PC−H contribute to the high performance for H2 O2 detection. Provided herein is a facile but efficient strategy for the synthesis of enzyme‐free electrochemical H2 O2 sensor for analytical applications. Abstract : A simple adsorption‐annealing synthetic strategy is employed for ultrasmall Co3 O4 NPs using the confinement of carbon nanopores in porous carbon. The achieved Co3 O4 /PC−H can be used as an excellent electrocatalyst for H2 O2 detection, with a high sensitivity of 332 μA mM −1 cm −2, a low detection limit of 1.2 μM, and an excellent linear detection ranges from 0.04 to 20 mM.