高等学校化学学报2025，Vol.46Issue(12)：67-76,10.DOI:10.7503/cjcu20250252
改性碳纳米管-钛电极的制备及电催化氧化应用
Preparation and Electrochemical Degradation of Ti/Nafion-CNTs/La-PbO2 Electrode
摘要
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.Concur-rently,optimal and stable PhOH removal is achieved under weakly acidic conditions(an electrode plate spacing of 10 mm and a solution pH=6).关键词
钛基电极/碳纳米管/全氟磺酸/电催化氧化Key words
Titanium anode/Carbon nanotubes/Nafion/Electrocatalytic oxidation分类
化学化工引用本文复制引用
郭新,刘淼..改性碳纳米管-钛电极的制备及电催化氧化应用[J].高等学校化学学报,2025,46(12):67-76,10.基金项目
吉林省能源局项目(批准号:3D516l911425)资助. Supported by the Project of the Energy Bureau of Jilin Province of China(No.3D516l911425). （批准号:3D516l911425）
