Lead dioxide electrodes on Ti substrates were prepared by thermal-deposition or electro-deposition. The amount of hydroxyl radicals generated at the electrodes prepared by the above-mentioned two methods was compared ...Lead dioxide electrodes on Ti substrates were prepared by thermal-deposition or electro-deposition. The amount of hydroxyl radicals generated at the electrodes prepared by the above-mentioned two methods was compared with that at the electrodes mingled with Bi or La prepared by electro-deposition. The experimental results indicate that the highest concentration of hydroxyl radicals generated by thermal-deposition, electro-deposition mingled with nothing, electro-deposition mingled with Bi or La was 0.781, 1.048, 1.838 or 2.044 μmol/L, respectively. When phenol was electrolyzed on the four electrodes at a current density of 30 mA/cm2, the removal efficiency of phenol after electrolysis for 1.5 h was 87.30%, 93.55%, 97.95% or 98.70%, TOC removal efficiency after electrolysis for 5 h was 86.76%, 94.26%, 98.53% or 99.60%, respectively. Through the degradation experiments of phenol, the amount of hydroxyl radicals was responsible for the removal efficiency of phenol. The electro-catalytic characteristics were investigated by SEM, the generation amount of hydroxyl radicals, the degradation degree of phenol and the stability and conductivity of the electrodes were also investigated. The experimental results indicate that the four electrodes all show good electro-catalytic characteristics; the electro-catalytic characteristics of the electrode mingled with La were superior to those of the other three ones, and the electrochemical degradation of phenol followed one-step reaction dynamics.展开更多
In order to investigate the effect of solid particles dopants on physicochemical properties of α-PbO2 electrodes, a-PbO2 composite electrodes doped with nano-TiO2 and nano-CeO2 particles were respectively prepared on...In order to investigate the effect of solid particles dopants on physicochemical properties of α-PbO2 electrodes, a-PbO2 composite electrodes doped with nano-TiO2 and nano-CeO2 particles were respectively prepared on A1/conductive coating electrodes in 4 mol/L NaOH solution with addition of PbO until saturation by anodic codeposition. The electrodeposition mechanism, morphology, composition and structure of the composite electrodes were characterized by cyclic voltarnmogram （CV）, SEM, EDAX and XRD. Results show that the doping solid particles can not change reaction mechanism of α-PbO2 electrode in alkaline or acid plating bath, but can improve deposition rate and reduce oxygen evolution potential. The doping solid particles can inhibit the growth of a-PbO2 unit cell and improve specific surface area. The diffraction peak intensity of a-PbO2-CeO2-TiO2 composite electrode is lower than that of pure a-PbO2 electrode. The electrocatalytic activity of a-PbO2-2.12%CEO2-3.71%TIO2 composite electrode is the best. The Guglielmi model for CeO2 and TiO2 codeposition with a-PbO2 is also pronosed.展开更多
PbO2/Co3O4 composites were prepared on a Ti substrate by means of a composite electrodeposition method in Pb2+ plating solution containing dissolved nano-Co3O4 particles. X-ray diffraction（XRD）, scanning electron mi...PbO2/Co3O4 composites were prepared on a Ti substrate by means of a composite electrodeposition method in Pb2+ plating solution containing dissolved nano-Co3O4 particles. X-ray diffraction（XRD）, scanning electron microscopy（SEM）, energy dispersive spectrometry（EDS） and transmission electron microscopy（TEM） were used to characterize the chemical composition and morphology of the PbO2/Co3O4 composites. The electrochemical and capacitance performance of the composites were investigated by cyclic voltammetry（CV）, charge-discharge tests and electrochemical impedance（EIS）. The results indicate that the composites comprise rutile phase Co3O4 and β-PbO2. In addition, the surface of the composite electrode is rough and porous. The PbO2/Co3O4 composites exhibit a high specific capacitance up to 215 F/g, which is ten times higher than that of the pure-PbO2 and two times higher than that of the pure-Co3O4 in 1 mol/L NaOH electrolytes.展开更多
Anodic oxidation electrodeposition is the primary way to prepare lead dioxide anode. The regulation of the external circuit for the reaction is a unique advantage of electrocatalytic reaction, which can regulate cryst...Anodic oxidation electrodeposition is the primary way to prepare lead dioxide anode. The regulation of the external circuit for the reaction is a unique advantage of electrocatalytic reaction, which can regulate crystallization and accelerate the reaction process. In this study, lead dioxide coatings with uniform pore size distribution were quickly prepared on three different substrates by potential linear increase electrodeposition(PLIED). Morphology and structure analysis shows that the prepared electrodes have uniform porous morphology, and Ti/SnO_(2)/PLIED has the smallest grain size. Three electrodes all display well degradation performance to azophloxine and diclofenac sodium. Ti/PLIED, and Ti/SnO_(2)/PLIED are appreciated for degrading organics with a simple structure in low concentrations. At the same time,Ti/SnO_(2)/PLIED is more suitable for complex organics in high concentrations. Electrochemical activity tests indicate the different mechanisms of the PLIED electrodes that build the other degradation performance.Three PLIED electrodes show excellent electrical and electrochemical stability during the cycle degradation process. The results provide a reference for the subsequent anodic oxidation electrodeposition research and the regulating effect of the external circuit on coating properties.展开更多
The Ti-supported lead dioxide electrode（Ti/PdO2） consisted of a Sb2O3/SnO2 semiconductive interlayer and electrodeposited PbO2 films was prepared. The optimum ratio of Sb2O3 to SnO2 was 15%25%. Addition of NaF（0.40...The Ti-supported lead dioxide electrode（Ti/PdO2） consisted of a Sb2O3/SnO2 semiconductive interlayer and electrodeposited PbO2 films was prepared. The optimum ratio of Sb2O3 to SnO2 was 15%25%. Addition of NaF（0.40 g/L） in electroplating solution could decrease the rate of PbO2 deposition, which resulted in the formation of small crystal particles and compact PbO2 films. XRD study showed the β-form crystal of electrode. The electrode was tested in synthesis of 4-picoline acid by electro-oxidation of 4-picoline, showing good electroconductivity and stable life.展开更多
The PbO 2 was used as an electrode material with Pt flake as substrate. The optimum plating conditions for electrode preparation are described. The prepared PbO 2 electrode is consisted of α PbO 2 and β PbO 2. XRD, ...The PbO 2 was used as an electrode material with Pt flake as substrate. The optimum plating conditions for electrode preparation are described. The prepared PbO 2 electrode is consisted of α PbO 2 and β PbO 2. XRD, XPS and SEM are used to approve the electrode performance. The results showed that the prepared PbO 2 electrode has advantages of longer life, better stability and higher oxidation efficiency for organic compounds.展开更多
基金the Environment Bureau of Jilin Province, China(No.2006-11)Scientific Institute of Changchun City(No. 2007KZ15)985 Project of Jilin University
文摘Lead dioxide electrodes on Ti substrates were prepared by thermal-deposition or electro-deposition. The amount of hydroxyl radicals generated at the electrodes prepared by the above-mentioned two methods was compared with that at the electrodes mingled with Bi or La prepared by electro-deposition. The experimental results indicate that the highest concentration of hydroxyl radicals generated by thermal-deposition, electro-deposition mingled with nothing, electro-deposition mingled with Bi or La was 0.781, 1.048, 1.838 or 2.044 μmol/L, respectively. When phenol was electrolyzed on the four electrodes at a current density of 30 mA/cm2, the removal efficiency of phenol after electrolysis for 1.5 h was 87.30%, 93.55%, 97.95% or 98.70%, TOC removal efficiency after electrolysis for 5 h was 86.76%, 94.26%, 98.53% or 99.60%, respectively. Through the degradation experiments of phenol, the amount of hydroxyl radicals was responsible for the removal efficiency of phenol. The electro-catalytic characteristics were investigated by SEM, the generation amount of hydroxyl radicals, the degradation degree of phenol and the stability and conductivity of the electrodes were also investigated. The experimental results indicate that the four electrodes all show good electro-catalytic characteristics; the electro-catalytic characteristics of the electrode mingled with La were superior to those of the other three ones, and the electrochemical degradation of phenol followed one-step reaction dynamics.
基金Project(51004056) supported by the National Natural Science Foundation of ChinaProject(KKZ6201152009) supported by the Opening Foundation of Key Laboratory of Inorganic Coating Materials,Chinese Academy of Sciences+2 种基金Project(2010ZC052) supported by the Applied Basic Research Foundation of Yunnan Province,ChinaProject(20125314110011) supported by the Specialized Research Fund for the Doctoral Program of Higher EducationProject(2010247) supported by Analysis & Testing Foundation of Kunming University of Science and Technology,China
文摘In order to investigate the effect of solid particles dopants on physicochemical properties of α-PbO2 electrodes, a-PbO2 composite electrodes doped with nano-TiO2 and nano-CeO2 particles were respectively prepared on A1/conductive coating electrodes in 4 mol/L NaOH solution with addition of PbO until saturation by anodic codeposition. The electrodeposition mechanism, morphology, composition and structure of the composite electrodes were characterized by cyclic voltarnmogram （CV）, SEM, EDAX and XRD. Results show that the doping solid particles can not change reaction mechanism of α-PbO2 electrode in alkaline or acid plating bath, but can improve deposition rate and reduce oxygen evolution potential. The doping solid particles can inhibit the growth of a-PbO2 unit cell and improve specific surface area. The diffraction peak intensity of a-PbO2-CeO2-TiO2 composite electrode is lower than that of pure a-PbO2 electrode. The electrocatalytic activity of a-PbO2-2.12%CEO2-3.71%TIO2 composite electrode is the best. The Guglielmi model for CeO2 and TiO2 codeposition with a-PbO2 is also pronosed.
基金Supported by the National Natural Science Foundation of China(No.51502117,No.21671084)Key Research&Development Plan of Zhenjiang City(No.SH2017051)+1 种基金Foundation from Marine Equipment and Technology Institute for Jiangsu University of Science and Technology(No.HZ20170015)Six Talent Peaks Project in Jiangsu Province(No.2014-XCL-008)
文摘PbO2/Co3O4 composites were prepared on a Ti substrate by means of a composite electrodeposition method in Pb2+ plating solution containing dissolved nano-Co3O4 particles. X-ray diffraction（XRD）, scanning electron microscopy（SEM）, energy dispersive spectrometry（EDS） and transmission electron microscopy（TEM） were used to characterize the chemical composition and morphology of the PbO2/Co3O4 composites. The electrochemical and capacitance performance of the composites were investigated by cyclic voltammetry（CV）, charge-discharge tests and electrochemical impedance（EIS）. The results indicate that the composites comprise rutile phase Co3O4 and β-PbO2. In addition, the surface of the composite electrode is rough and porous. The PbO2/Co3O4 composites exhibit a high specific capacitance up to 215 F/g, which is ten times higher than that of the pure-PbO2 and two times higher than that of the pure-Co3O4 in 1 mol/L NaOH electrolytes.
基金the financial supports from the National Natural Science Foundation of China (No. 52270078)the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2021JM-012)+1 种基金the Welfare Technology Research Plan of Zhejiang Province (No. LZY21E080003)the Fundamental Research Funds for the Central Universities (No. xjh012020037)。
文摘Anodic oxidation electrodeposition is the primary way to prepare lead dioxide anode. The regulation of the external circuit for the reaction is a unique advantage of electrocatalytic reaction, which can regulate crystallization and accelerate the reaction process. In this study, lead dioxide coatings with uniform pore size distribution were quickly prepared on three different substrates by potential linear increase electrodeposition(PLIED). Morphology and structure analysis shows that the prepared electrodes have uniform porous morphology, and Ti/SnO_(2)/PLIED has the smallest grain size. Three electrodes all display well degradation performance to azophloxine and diclofenac sodium. Ti/PLIED, and Ti/SnO_(2)/PLIED are appreciated for degrading organics with a simple structure in low concentrations. At the same time,Ti/SnO_(2)/PLIED is more suitable for complex organics in high concentrations. Electrochemical activity tests indicate the different mechanisms of the PLIED electrodes that build the other degradation performance.Three PLIED electrodes show excellent electrical and electrochemical stability during the cycle degradation process. The results provide a reference for the subsequent anodic oxidation electrodeposition research and the regulating effect of the external circuit on coating properties.
文摘The Ti-supported lead dioxide electrode（Ti/PdO2） consisted of a Sb2O3/SnO2 semiconductive interlayer and electrodeposited PbO2 films was prepared. The optimum ratio of Sb2O3 to SnO2 was 15%25%. Addition of NaF（0.40 g/L） in electroplating solution could decrease the rate of PbO2 deposition, which resulted in the formation of small crystal particles and compact PbO2 films. XRD study showed the β-form crystal of electrode. The electrode was tested in synthesis of 4-picoline acid by electro-oxidation of 4-picoline, showing good electroconductivity and stable life.
文摘The PbO 2 was used as an electrode material with Pt flake as substrate. The optimum plating conditions for electrode preparation are described. The prepared PbO 2 electrode is consisted of α PbO 2 and β PbO 2. XRD, XPS and SEM are used to approve the electrode performance. The results showed that the prepared PbO 2 electrode has advantages of longer life, better stability and higher oxidation efficiency for organic compounds.
