Papers by Keyword: Electrocatalysis

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Authors: B. Łosiewicz, Magdalena Popczyk
Abstract: Electrocatalysis as a catalytic process involving oxidation or reduction through the direct transfer of electrons is of key importance subject in various fields of chemistry and associated sciences. Heterogeneous electrocatalysis is especially important to the development of water oxidation and fuel cells catalysts. This paper presents the brief description of the electrocatalysis and the mechanism of electrochemical reactions. Different factors and their influence on electrocatalytic activity, have been discussed. Role of nanoparticles in electrocatalysis received a particular emphasis. Long-term tasks of electrocatalysis were also definied.
179
Authors: Bu Ming Chen, Zhong Cheng Guo, Hui Huang
Abstract: During electrodepositing pure lead dioxide, the electrocatalytic activity of PbO2 electrodes, as well as their stability, can often be considerably enhanced by the incorporation of some fine particles added to the electrodeposition. The morphology, crystal phase, surface composition, microstructure, of the electrode were characterized by means of SEM, XRD and EDS. SEM-EDS analysis showed the addition of solid particles could inhibit the growth of α-PbO2 unit cells, improving the specific surface areas of coating surface.Under all condition, the matrix was highly oriented α-PbO2. The electrocatalytic activity of the prepared materials has been tested in Zn2+ 50g L-1, H2SO4 150g L-1 solution. It showed that the electrocatalytic activity of the A1/conductive coating/α-PbO2-3.71 wt.% TiO2-2.12 wt.% CeO2 anode is the best.
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Authors: T.A.B. Santoro, Almir Oliveira Neto, Rubens Chiba, Emília Satoshi Miyamaru Seo, E.G. Franco
Abstract: Pt/rare-earth cathode catalysts were synthesized by the alcohol-reduction process and its structure was investigated by transmission electron microscopy (TEM), energy dispersive analyses (EDS), X-ray Diffraction (XRD). The electrochemical behavior of the cathode catalyst was analyzed by cyclic voltammetry (CV) chronoamperommetry (CA).
94
Authors: Ting Yu
Abstract: With mixed rare earth (La, Ce, Nd) doping Ti/TiO2 electrode for the anode, degradation situation of oilfield wastewater was studied. The results showed that electrocatalysis technology excels at treating oilfield wastewater. Electrocatalytic oxidation reaction kinetic equation: At=A0exp(-7.02×10-7D-1.42M-1.66U3.40t).
1674
Authors: De Fa Meng, Gang Li, Fang Yang, Zhi Hua Liu
Abstract: A novel method of cellulose degradation is investigated in this paper. In this work, a three-electrode system, which contains a Pb/PbO2 anode, two copper cathodes and a reference saturated calomel electrode (SCE), is applied to electrocatalytic degradation of cellulose. The composition of the products in filtrate is characterized by phenol-sulfuric acid method, NMR and GC-MS. In addition, the solid sample is analyzed via Ubbelohde capillary viscometer and FT-IR spectra. The results suggest that it is effective to convert cellulose to soluble sugar, 5-hydroxymethylfurfural (5-HMF) and other products by electrocatalytic method. The reaction mechanism of cellulose degradation is also discussed.
1036
Authors: Marcello Baricco, F. Minichilli, E. Angelini, S. Spriano, F. Rosalbino, P. Spinelli, Emma Paola Maria Virginia Angelini
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Authors: Ying Zhang, Guo Bao Li, Qiu Xia Yang
Abstract: The titanium sol was prepared by depositing the organic titanium on glassy carbon electrode surface. Electrophoresis time and the applied voltage as well can markedly influence the electrochemical behavior of the nanoTiO2 film. In contrast with bare glassy carbon electrode, the nanoTiO2 film on glassy carbon electrode had a good electrocatalytic activity to dopamine (DA) and uric acid (UA) in PBS solution. The result showed that there was a linear relationship between the oxidation peak currents and the concentration of DA from 8.0×10-6 to 4.0×10-4 mol·L-1 by differential pulse voltammetry (DPV) and there was a linear relationship between the oxidation peak currents and the concentration of UA from 8×10-6 to 1.0×10-3 mol·L-1. This modified electrode was quite effective to detect DA and UA in simultaneous determination of these species in a mixture.
508
Authors: Xiao Yun Yan, Feng Wu Wang, Mai Xu, Bo Xu
Abstract: Homogeneous and transparent lanthanum La-doped TiO2 nanocrystalline thin films were deposited on pure titanium substrates by sol gel dip coating method. The surface structures, morphologies and electrocatalytic activities of the prepared nano-TiO2 film electrodes were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Cyclic voltammetry (CV). The results demonstrated that the optimum molar proportion of La was 0.5%. This optimum La-nanoTiO2 electrode (Ti/0.5%La nano-TiO2) showed a higher electrocatalytic activity than the undoped nano-TiO2 electrode (Ti/nano-TiO2)
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