Abstract
This work focuses on the fabrication of zero-dimensional (0D) and one-dimensional (1D) based nanocomposite materials for hydrogen peroxide (H2O2) sensing applications. We demonstrate an environmentally friendly synthesis approach for ZIF-67 growth on CTAB functionalized MWCNT using deionized water as a solvent medium (ZIF-67@CT-MWCNT). The pyrolysis treatment effectively formed a 0D/1D composite structure consisting of core-shell Co/N dual-doped carbon nanospheres and a CT-MWCNT network (referred to as Co-N/C@CT-MWCNT). The characteristic properties of composite materials were clearly investigated by SEM, TEM, XRD, micro-Raman, and XPS analysis. The electrocatalytic properties of Co-N/C@CT-MWCNT toward H2O2 reduction are also examined by cyclic voltammetry and amperometry techniques. The results indicated that the Co-N/C@CT-MWCNT modified electrode shows fast electron transfer kinetics for reduction of H2O2 in pH 7 electrolyte compared to other control electrodes. It mainly depends on the high catalytic activity of Co-Nx active species and the high electron conductive carbon network in the composite structure. Amperometry determination of H2O2 reduction on Co-N/C@CT-MWCNT electrode was performed at − 0.4 V (vs. Ag/AgCl), which shows rapid H2O2 sensing response time within 2 s, resulting in a wide linear range (0.5 μM - 25.74 mM) with the detection limit of 0.18 μM. The Co-N/C@CT-MWCNT sensor also showed excellent sensitivity (868.88 μA mM−1 cm−2), operational stability, and selectivity to H2O2 sensing. Thus, our proposed hybrid electrocatalyst material could be able to fabricate with commercial screen-printed carbon electrodes for the real-time H2O2 sensing application.
Published Version
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