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Preparation of a novel supported electrode comprising a nickel(Ⅱ)hydroxide-modified carbon paste electrode(Ni(OH)_2-X/CPE)for the electrocatalytic oxidation of formaldehyde

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Chinese Journal of Catalysis 2016年第1期37卷 159-168页

作者： Safura Kavian Seyed Naser Azizi shahram ghasemi 马赞德兰大学化学学院分析部马赞德兰大学化学学院

We prepared a novel nickel（II）hydroxide-modified carbon paste electrode（Ni（OH）2-X/CPE）for the electrocatalytic oxidation of *** electrode was prepared by a simple method without the use of linking *** prepared Ni（OH）2-X/CPE material was characterized by scanning electron microscopy and energy dispersive X-ray *** electrochemical performance of the proposed electrode was investigated using cyclic voltammetry,electrochemical impedance spectroscopy,and *** results indicate that Ni（OH）2-X/CPE exhibits good electrocatalytic activity with regards to formaldehyde oxidation owing to its nanoporous structure and the large surface area of zeolite *** values of the electron transfer coefficient and the catalytic rate constant were 0.7 and 6.1 × 104 cm3/（mol·s）,***,the proposed electrode,which showed remarkable electroactivity with regards to formaldehyde oxidation with long-term stability and good reproducibility,could be useful in fuel cells.

关键词： Fuel cell Electrocatalyst Porous NaX nanozeolite Formaldehyde Chronoamperometry

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以方沸石负载Ni(Ⅱ)催化剂修饰的电极电氧化甲醇(英文)

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催化学报 2014年第3期35卷 383-390页

作者： Seyed Naser Azizi shahram ghasemi Neda Salek Gilani Analytical Division Faculty of ChemistryUniversity of Mazandaran Faculty of Chemistry University of Mazandaran

There is a high overvoltage in the oxidation of methanol in fuel cells,and so modified electrodes are used to decrease it.A modified electrode that used Ni(II) loaded analcime zeolite to catalyze the electrooxidation of methanol in alkaline solution was *** zeolite was synthesized by hydrothermal synthesis,and Ni(II) ions were incorporated into the analcime structure,which was then mixed with carbon paste to prepare modified *** electrocatalytic oxidation of methanol on the surface of the modified electrode in alkaline solution was investigated by cyclic voltammetry and *** effects of the scan rate of the potential,concentration of methanol,and amount of zeolite were *** rate constant for the catalytic reaction of methanol was 6 × 103 cm3 mol-1 s-1 from measurements using *** proposed electrode significantly improved the electron transfer rate and decreased the overpotential for methanol oxidation.

关键词：甲醇燃料电池沸石催化剂修饰电极 Ni 电氧化方沸石沸石分子筛改性电极

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Coupling system application in photocatalytic degradation of methylorange by TiO_2, TiO_2/SiO_2 and TiO_2/SiO_2/Ag

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Rare Metals 2015年第12期34卷 851-858页

作者： Hossein ghasemi Mobtaker Seyed Javad Ahmadi shahram Moradi Dehaghi Taher Yousefi Nuclear Fuel Cycle Research School Nuclear Science and Technology Research Institute Faculty of Chemistry Tehran North Branch Islamic Azad University

Three different photocatalysts including TiO2, TiO2/SiO2 and TiO2/SiO2/Ag were synthesized via sol–gel growth method, in which colloidal silica was used as Si source, titanium tetra iso-propoxide (TTiP) as titanium source, Ag+ as dopant ion and hydroxypropyl cellulose (HPC) as dispersant. The purpose was to study the enhancement of photocatalytic activity of TiO2 by deposition on SiO2 colloids and also doping with Ag ion. The catalysts were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FT-IR) and Brunauer–Emmett–Teller (BET) methods. It is confirmed that the major phase in all catalysts is anatase. Photocatalytic activity was studied in various conditions for degradation of methylorange (as a model pollutant) to evaluate the effect of some parameters on degradation efficiency. Studying the degradation process in various pH values reveals that the degradation is more efficient in acidic solution than alkaline condition. Coupling the photocatalytic process with some fields called electro-photochemical (EP), magnetic-photochemical (MP) and ultrasonic-photochemical (UP) was studied at two pH values which were compared with photochemical (P) alone. It is concluded that in most cases, the EP is the best coupled system and has the maximum efficiency. Liquid chromatography–mass spectrometry (LC–MS) analysis was used to check the complete decomposition of methylorange at the end of process.

关键词： Doping Electro-photochemical Magnetic-photochemical Ultrasonic-photochemical Sol–gel

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