Several Ti supported oxide anodic materials are prepared by thermal decomposition method and the anodic kinetic parameters ( a,b,i 0) are determined in 1 mol/L H 2SO 4 solution. The SEM photographs of the electrodes a...Several Ti supported oxide anodic materials are prepared by thermal decomposition method and the anodic kinetic parameters ( a,b,i 0) are determined in 1 mol/L H 2SO 4 solution. The SEM photographs of the electrodes are scanned and saved as a BMP image file, from which a three dimensional space with graph and grey scale is obtained. Then the fractal dimension of the electrodes is calculated by using the formula D B( F ) =log N δ(F )/-log δ and a calculation program. The electrocatalytic performance of the electrodes is discussed combining with the fractal dimension and kinetic parameters. The influences of the electrode composition on the kinetic parameters are also discussed according to the dual barrier model and mechanism of the oxygen evolution at oxide anodes. The results show that the larger fractal dimension of the electrodes is, the better electrocatalytic activity is.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 decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2,RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition,was investigated in the electrolysis system of constant potential and the...The decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2,RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition,was investigated in the electrolysis system of constant potential and the non-electrolysis system respectively.Additionally,the influence of the decomposition of H2O2 caused by Ti-based oxide electrode on the oxidation of aniline was also investigated.The results showed that both higher loading of oxides and higher pH were able to accelerate the decomposition of H2O2 in the non-electrolysis system and in this case the decay of H2O2 was mainly caused by the catalytic action of the oxides coating.In the electrolysis system with Ti-based oxides electrode as anode,the decay rate of H2O2 increased with increasing anodic potential.In this case,the decay of H2O2 involved two mechanisms: catalytic decomposition and electrochemical oxidation.It was also found that the catalytic decomposition of H2O2 at the oxides electrode was useless to the oxidation of aniline while the electrochemical oxidation of H2O2 was only slightly helpful to the oxidation of aniline.This work suggested that using the appropriate anodes of less H2O2 decomposition as well as reasonable potential in the electro-Fenton process could achieve high chemical efficiency of H2O2.展开更多
文摘Several Ti supported oxide anodic materials are prepared by thermal decomposition method and the anodic kinetic parameters ( a,b,i 0) are determined in 1 mol/L H 2SO 4 solution. The SEM photographs of the electrodes are scanned and saved as a BMP image file, from which a three dimensional space with graph and grey scale is obtained. Then the fractal dimension of the electrodes is calculated by using the formula D B( F ) =log N δ(F )/-log δ and a calculation program. The electrocatalytic performance of the electrodes is discussed combining with the fractal dimension and kinetic parameters. The influences of the electrode composition on the kinetic parameters are also discussed according to the dual barrier model and mechanism of the oxygen evolution at oxide anodes. The results show that the larger fractal dimension of the electrodes is, the better electrocatalytic activity is.
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 decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2,RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition,was investigated in the electrolysis system of constant potential and the non-electrolysis system respectively.Additionally,the influence of the decomposition of H2O2 caused by Ti-based oxide electrode on the oxidation of aniline was also investigated.The results showed that both higher loading of oxides and higher pH were able to accelerate the decomposition of H2O2 in the non-electrolysis system and in this case the decay of H2O2 was mainly caused by the catalytic action of the oxides coating.In the electrolysis system with Ti-based oxides electrode as anode,the decay rate of H2O2 increased with increasing anodic potential.In this case,the decay of H2O2 involved two mechanisms: catalytic decomposition and electrochemical oxidation.It was also found that the catalytic decomposition of H2O2 at the oxides electrode was useless to the oxidation of aniline while the electrochemical oxidation of H2O2 was only slightly helpful to the oxidation of aniline.This work suggested that using the appropriate anodes of less H2O2 decomposition as well as reasonable potential in the electro-Fenton process could achieve high chemical efficiency of H2O2.
