مقالههای Ahmad Rouhollahi
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، اول،شماره۴، Dec ۲۰۰۹، سال ۰
تعداد صفحات: ۷
The corrosion and passivation of tin anode in citrate (0.01 to 1.0 M) solution was investigated using steady state polarization, impedance spectroscopy and cyclic voltammetric techniques. Before permanent passive region, two anodic peaks were observed in the anodic polarization curve, corresponding to the consecutive electroformation of Sn(II) and Sn(IV) species. The corrosion current was calculated by the Tafel extrapolation procedure at different concentrations of citrate ion and different pH values. Also, the corrosion resistance at the corrosion potential was calculated from the Nyquist diagram of different concentration of citrate ion. It was found the latter gives more precise results.
۲Comprehensive Study of Electrochemical and Electrocrystallization Behavior of Silver (I) in Molten Salt Eutectic of Ca(NO3)2–NH4NO3 and Acquiring its Kinetic and Thermodynamic Parameters with Different Electrochemical Techniques
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، سوم،شماره۴، Aug ۲۰۱۱، سال ۰
تعداد صفحات: ۲۳
Electrochemical studies were carried out on silver nitrate in molten eutectic Ca(NO3 )2–NH4NO3 Transient techniques; i.e., cyclic voltammetry, square wave voltammetry, convolution voltammetry and chronopotentiometry were used in order to study the reaction mechanism and transport parameters of electroactive specie on an inert electrode. The reversibility of the system was studied and the results showed that the electrochemical system Ag(I)\Ag(0) was quasi–reversible. Values of the kinetic and thermodynamic parameters; k° (standard rate constant), α (transfer coefficient), io (exchange current), E° (standard potential) and parameter Λ for Ag(I) were obtained (Λ=k°\ (D f υ)1\2). Mass transport toward the electrode is a simple diffusion process, and the D (diffusion coefficient) of Ag(I) was also calculated and the validity of the Arrhenius law for process was also qualified. Diffusion activation energy (Ea) and activation energy (E a) for the electron transfer reaction were calculated. Chronoamperometric study indicated instantaneous nucleation of Ag with threedimensional growth of the nucleus while the applied overpotential was.
۳Pulsed Electrodeposition of Platinum Nanoparticles on Fluorine Doped Tin Oxide in Molten Salt and Its High Electrocatalytic Activity Towards Ethanol Oxidation
نویسنده(ها): Ahmad Rouhollahi، Sepideh Zendehdel، Mohammad Hamed Barzegar Khaleghi and Omid Fazlolahzadeh
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، ششم،شماره۱، Feb ۲۰۱۴، سال ۰
تعداد صفحات: ۱۱
This paper presents pulse potential electrodeposition of platinum nanoparticles on fluorine doped tin oxide (FTO) from AlCl3–NaCl molten salt containing K2PtCl6 at 393K. The results showed that by optimizing the deposition parameters including the on potential, off potential, on time and duty cycle we are able to improved catalytic performance of PtNPs\FTO modified electrode for ethanol electrooxidation. The two– level factorial design was used to screen and optimize the pulse potential electrodeposition variables. The prepared PtNPs\FTO electrodes were characterized by scanning electron microscopy, Energy–dispersive X–ray spectroscopy and cyclic voltammetry. The prepared PtNPs\FTO exhibited high performance in the electrocatalytic oxidation of ethanol in alkaline solution.
نمایش نتایج ۱ تا ۳ از میان ۳ نتیجه