SCHEDULED MAINTENANCE
Fabrication and characterization of a novel PbO2 electrode with a CNT interlayer†
Abstract
A novel PbO2 electrode (marked as CNT–PbO2) with a carbon nanotube (CNT) interlayer was prepared by electrophoretic deposition and electro-deposition. The surface morphology, structure, electrochemical activity and stability of the CNT–PbO2 electrodes were characterized by scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ·OH production test, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), bulk electrolysis and accelerated life test. The results show that, compared with the traditional PbO2 electrode, the CNT–PbO2 electrodes electrodeposited β-PbO2 outer layer above the CNT interlayer had a higher crystallinity. The CNT–PbO2-5 min electrode had a higher active surface area and lower charge transfer resistance than traditional PbO2, CNT–PbO2-10 min, and CNT–PbO2-15 min electrodes due to a large number of exposed CNTs. However, the CNT–PbO2-10 min electrode exhibited a stronger ability of ·OH production, higher direct oxidation capacity for degradation of 4-chlorophenol (4-CP) and longer service lifetime than other electrodes, whose apparent rate constant for 4-CP degradation and service lifetime was 2.7 times and 1.7 times those of traditional PbO2 electrode, respectively. Thus, the proposed CNT–PbO2-10 min electrode in this study is a promising anode for the electrochemical oxidation of refractory toxic organic pollutants.
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