Mesoporous NiO nanosphere: a sensitive strain sensor for determination of hydrogen peroxide

Abstract

Exploring the sensitive and reliable methods for the determination of hydrogen peroxide (H 2 O 2 ) is a crucial issue for the health and environmental challenges. Herein, we demonstrate a facile, but rational and effective solvothermal approach to the synthesis of hierarchical NiO mesoporous nanospheres (NiO-MNS) as an effective non-enzymatic sensor towards the H 2 O 2 detection. Owing to the intercalation and stabilization effect of polyethylene glycol for the Ni(OH) 2 intermediate, the NiO mesoporous nanosphere (NiO-MNS) product is consistent with the low-dimensional nanostructured NiO blocks with large surface area and plentiful mesopores after the calcination treatment. The obtained NiO-MNS sensor presents superior electrochemical performance with a high sensitivity (236.7 mA mM À1 cm À2 ) and low limit of detection (0.62 mM), as well as the good selectivity and reliability for the further application of H 2 O 2 detection. In addition, the unraveling mechanism of the mesopores formation derived from the in situ measurements also offers the valuable guidance for the future design of porous materials for electrochemical devices and other applications.

Selective Reduction of O2 to H2O2 by Novel EDTA-Derived Ni-Nanoparticle-Set Nitrogen-Doped Carbon Catalysts

“…These findings correlate with electron microscopy results that depict nickel nanoparticles embedded within a carbon matrix (Figure c). The peaks with binding energies of 858.9 and 878.3 eV are the satellite peaks of Ni 2p …”

“…The peaks with binding energies of 858.9 and 878.3 eV are the satellite peaks of Ni 2p. 39 Analysis of the N 2 adsorption−desorption isotherm (Figure S3a) unveiled BET surface areas of 6.81 m 2 /g for N−C and 31.8 m 2 /g for Ni 0.75 NP s @N−C. Furthermore, the pore size distribution determined using the BJH method from the desorption branch of the isotherm (Figure S3b) indicates a predominantly mesoporous structure for Ni 0.75 NP s @N−C with a pore size of 7.4 nm, compared to 5.8 nm for N−C.…”

Treatment with ROS detoxifying gold quantum clusters alleviates the functional decline in a mouse model of Friedreich ataxia

“…The oxidation peak intensity decreased with the number of cycles, in agreement with the progressive transformation of all the H2O2 in solution. This signal marks the oxidation of the H2O2 that evolve in the production of water and oxygen molecules (54). The dynamic of the H2O2 oxidation was then verified in presence of Au8-pXs.…”

NiO-nanoflowers decorating a plastic electrode for the non-enzymatic amperometric detection of H2O2 in milk: Old issue, new challenge

“…The nanocomposite exhibited high electrocatalytic activity in alkaline media with LOD of 0.766 µM and linear range of 0.25-4.75 mM. Li et al (2018) synthesized a 3D hierarchical NiO mesoporous nanospheres with enhanced electrochemical performance for the determination of H2O2 with a LOD of 0.62 µM, good sensitivity and reliability (Li et al, 2018). Another approach is stabilizing or embeds at the conventional electrode surface, NiO nanostructures by "dip and dry" strategy or by entrapment in ionic polymers (Singh et al, 2020, Hosseinian et al, 2019.…”