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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Frontiers in Chemical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Ethanol,Cu-BDC MOF,electroxidation,chronoamperometry
- چکیده:
- چکیده انگلیسی: Fuel cells are promising alternatives in power generation. Direct ethanol fuel cells (DEFCs) offer significant advantages due to the comparatively safe handling, non-toxicity and renewability of ethanol as well as its high power density. Development of the efficient catalysts for ethanol electroxidation has attracted great attention and represents one of the major challenges in electrocatalysis. This work investigates ethanol electrooxidation on Cu-BDC MOF catalyst-modified electrodes. The catalysts are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), cyclic voltammetry (CV) and chronoamperometry (CA) techniques. The Cu-BDC MOF catalyst shows significantly improved catalytic activity and high durability for ethanol electrooxidation.
- انتشار مقاله: 01-02-1399
- نویسندگان: Behruz Zare,Mahmoud Roushani
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Vanadyl complexes,Tridentate schiff base ligands,Schiff base Complexes,Thermogravimetry,Electrochemistry,Ab initio calculations
- چکیده:
- چکیده انگلیسی: The VO(IV) complexes of tridentate ONO Schiff base ligands derived from 2- aminobenzoicacid and salicylaldehyde derivatives were synthesized and characterized by IR, UV–Vis and elemental analysis. Electrochemical properties of the vanadyl complexes were investigated by cyclic voltammetry. A good linear correlation was observed between the oxidation potentials and the electron-withdrawing character of the substituents on the Schiff bases, showed the following trend: MeO < H < Br < NO2. The thermogravimetry (TG) and differential thermoanalysis (DTA) of the synthesized complexes were carried out in the range of 20–700 °C. All of the complexes decomposed in three steps. The thermal decomposition pathways were closely related to the nature of the Schiff base ligands and preceded via first-order kinetics. The structures of compounds were determined by ab initio calculations. The optimized molecular geometry was calculated at the B3LYP/6-31G(d) level. The results suggested that, in the complexes, V(IV) ion was in square-pyramid or TBP (trigonal bipyramidal) NO4 coordination geometry. Also the bond lengths and angles were studied and compared.
- انتشار مقاله: 12-03-1393
- نویسندگان: Ali Hossein Kianfar,Hajar Mohamadi Malek Abadi,Roghayeh Hashemi Fath,Mahmoud Roushani
- مشاهده
- جایگاه : پژوهشی
- مجله: Frontiers in Chemical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Ethanol,Cu-BDC MOF,electroxidation,chronoamperometry
- چکیده:
- چکیده انگلیسی: Fuel cells are promising alternatives in power generation. Direct ethanol fuel cells (DEFCs) offer significant advantages due to the comparatively safe handling, non-toxicity and renewability of ethanol as well as its high power density. Development of the efficient catalysts for ethanol electroxidation has attracted great attention and represents one of the major challenges in electrocatalysis. This work investigates ethanol electrooxidation on Cu-BDC MOF catalyst-modified electrodes. The catalysts are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), cyclic voltammetry (CV) and chronoamperometry (CA) techniques. The Cu-BDC MOF catalyst shows significantly improved catalytic activity and high durability for ethanol electrooxidation.
- انتشار مقاله: 01-02-1399
- نویسندگان: Behruz Zare,Mahmoud Roushani
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Vanadyl complexes,Tridentate schiff base ligands,Schiff base Complexes,Thermogravimetry,Electrochemistry,Ab initio calculations
- چکیده:
- چکیده انگلیسی: The VO(IV) complexes of tridentate ONO Schiff base ligands derived from 2- aminobenzoicacid and salicylaldehyde derivatives were synthesized and characterized by IR, UV–Vis and elemental analysis. Electrochemical properties of the vanadyl complexes were investigated by cyclic voltammetry. A good linear correlation was observed between the oxidation potentials and the electron-withdrawing character of the substituents on the Schiff bases, showed the following trend: MeO < H < Br < NO2. The thermogravimetry (TG) and differential thermoanalysis (DTA) of the synthesized complexes were carried out in the range of 20–700 °C. All of the complexes decomposed in three steps. The thermal decomposition pathways were closely related to the nature of the Schiff base ligands and preceded via first-order kinetics. The structures of compounds were determined by ab initio calculations. The optimized molecular geometry was calculated at the B3LYP/6-31G(d) level. The results suggested that, in the complexes, V(IV) ion was in square-pyramid or TBP (trigonal bipyramidal) NO4 coordination geometry. Also the bond lengths and angles were studied and compared.
- انتشار مقاله: 12-03-1393
- نویسندگان: Ali Hossein Kianfar,Hajar Mohamadi Malek Abadi,Roghayeh Hashemi Fath,Mahmoud Roushani
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Nanochemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: Chitosan,5-Fluorouracil,Carbon nanotubes,Copper nanoparticles
- چکیده:
- چکیده انگلیسی: A fast and facile electrochemical sensor for detection of important anti-cancer drug 5-fluorouracil (5-FU) is fabricated using a copper-nanoparticles decorated multi-walled carbon nanotube and chitosan composite modified electrode. Copper nanoparticles/multi-walled carbon nanotubes/ionic liquid/chitosan modified glassy carbon electrode (CuNPs/MWCNTs/IL/Chit/GCE) prepared by the consecutive coating of MWCNTs/IL/Chit nanocomposite on the GCE, followed by the electrodeposition of copper. Surface characteristics of the modified electrode were studied by scanning electron microscopy (SEM). The electrochemical capability of the fabricated modified electrode for the detection of 5-FU is examined by cyclic voltammetry, differential pulse voltammetry (DPV). The nano Cu decorated MWCNTs/IL/Chit/GCE is found to be efficient for the electrocatalytic oxidation of 5-FU. The peak current of the DPV exhibited a linear relationship against 5-FU over a wide concentration range of 1-110 µM with a low detection limit (0.15 µM). Additional, the sensor was successfully applied in biological fluid sample analysis.
- انتشار مقاله: 20-03-1398
- نویسندگان: Mahmoud Roushani,Zahra Saeidi,Sara Hemati,Maryam Hosseini
- مشاهده