Preparation and Electrochemical Degradation of Ti/Nafion-CNTs/La-PbO2 Electrode

doi:10.7503/cjcu20250252

Abstract

Abstract:

To enhance the electrocatalytic oxidation capability of lead dioxide（PbO₂） electrodes， pretreated titanium plates（Ti） as the substrate， a lanthanum-doped lead dioxide modified electrode（Ti/Nafion-CNTs/La-PbO₂） was prepared by constructing a perfluorosulfonic acid-carbon nanotube（Nafion-CNTs） intermediate modification layer and employing electrodeposition technology. Its electrocatalytic degradation performance towards typical organic pollutants methyl orange（MO） and phenol（PhOH） was systematically evaluated. Material characterisation reveals the electrode possesses excellent physicochemical properties. Firstly， infrared spectroscopy confirms the successful introduction of hydrophilic functional groups， including hydroxyl and carboxyl groups， onto the surface of acid-washed activated carbon nanotubes（CNTs）， effectively enhances surface activity and substrate bonding capability. Scanning electron microscopy（SEM） reveals that the La-PbO₂ catalytic layer on the electrode surface is composed of densely packed irregularly shaped crystalline particles approximately 5 μm in size to form a rough microstructure with high specific surface area. X-ray diffraction（XRD） patterns further indicate lanthanum successful dopes into the PbO₂ lattice， inducing significant lattice distortion， which facilitates the generation of additional catalytic active sites. Electrochemical performance testing demonstrates the modified electrode exhibits outstanding electrocatalytic activity. Compared to the unmodified electrode， the Ti/Nafion-CNTs/La-PbO₂ electrode exhibits lower electrical resistivity and higher hydroxyl radical（^•OH） yield， directly correlating with its enhanced degradation capability. In experiments targeting MO degradation， this electrode demonstrates exceptionally high efficiency， achieving a removal rate of 70.52% within 20 min of reaction， with near-complete degradation observed after 60 min. With PhOH as the target contaminant， the influence of operating conditions on degradation efficiency was further investigated. Experimental results reveal a positive correlation between phenol removal rate and applied current density. Concurrently， optimal and stable PhOH removal is achieved under weakly acidic conditions（an electrode plate spacing of 10 mm and a solution pH=6）.

Key words: Titanium anode, Carbon nanotubes, Nafion, Electrocatalytic oxidation

CLC Number:

O643

TrendMD:

GUO Xin, LIU Miao. Preparation and Electrochemical Degradation of Ti/Nafion-CNTs/La-PbO₂ Electrode[J]. Chem. J. Chinese Universities, 2025, 46(12): 20250252.

Figures/Tables 7

References 36

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Electrode	k₁/min^-1	k_S/（min^-1·m^-2）	t_1/2/min	R²
Ti/Nafion⁃CNTs/La⁃PbO₂	0.0972	25.553	7.148	0.901
Ti/CNTs/La⁃PbO₂	0.0419	11.038	16.549	0.981
Ti/La⁃PbO₂	0.0648	17.070	10.701	0.964
Ti/PbO₂	0.0508	13.382	13.650	0.934

Electrode	k₁/min^-1	k_S/（min^-1·m^-2）	t_1/2/min	R²
Ti/Nafion⁃CNTs/La⁃PbO₂	0.0972	25.553	7.148	0.901
Ti/CNTs/La⁃PbO₂	0.0419	11.038	16.549	0.981
Ti/La⁃PbO₂	0.0648	17.070	10.701	0.964
Ti/PbO₂	0.0508	13.382	13.650	0.934

Preparation and Electrochemical Degradation of Ti/Nafion-CNTs/La-PbO₂ Electrode

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