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RISS 인기검색어
- 검색키워드
- 저자 : Moghanni-Bavil-Olyaei, Hamed (검색결과 3 건)
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Arjomandi, Jalal,Moghanni-Bavil-Olyaei, Hamed,Parvin, Mohammad Hadi,Lee, Jin Yong,Chul Ko, Kyoung,Joshaghani, Mohammad,Hamidian, Kourosh Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.746 No.-
<P><B>Abstract</B></P> <P>The inhibition effect of a Schiff base with several functional groups on the corrosion of aluminum in alkaline solution is studied by experimental techniques and density function theory (DFT) calculations. The Schiff base are characterized by <SUP>1</SUP>HNMR, <SUP>13</SUP>CNMR, FT-IR, and CHN elemental analysis. In addition, different electrochemical and corrosion techniques such as weight loss, tafel polarization, electrochemical impedance spectroscopy (EIS) and optical microscopy images are performed to analyze the inhibiting performances. In the Tafel measurements the cathodic Tafel slopes values incurred small changes with increasing the inhibitor concentration, which revealed that the inhibitor was adsorbed on the aluminum surface. The inhibition efficiencies are calculated from weight loss measurement and electrochemical tests. The adsorption of the inhibitor onto the aluminum surface follows the Langmuir adsorption isotherm with the free adsorption energy of −8.66 kJ mol<SUP>−1</SUP>. The calculated adsorption energies and the amount of charge transfer obtained by DFT calculation revealed that corrosion inhibition effectively occurs with chemisorption, where new NAl bonds are formed between of N atoms in azo (–NN–) group and Al surface atoms, which is confirmed from <I>ab initio</I> molecular dynamics (AIMD) simulation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel Schiff base were synthesized as inhibitor for Al corrosion in alkaline. </LI> <LI> The Schiff base were characterized by <SUP>1</SUP>HNMR, <SUP>13</SUP>CNMR, FT-IR, and CHN. </LI> <LI> The inhibition effect of Schiff base were studied by experimental and DFT. </LI> <LI> The adsorption of inhibitor on Al surface follows Langmuir adsorption isotherm. </LI> <LI> The corrosion inhibitions is chemisorptions which confirmed by AIMD simulation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Arjomandi, Jalal,Lee, Jin Yong,Movafagh, Raheleh,Moghanni-Bavil-Olyaei, Hamed,Parvin, Mohammad Hadi Elsevier 2018 Journal of electroanalytical chemistry Vol.810 No.-
<P><B>Abstract</B></P> <P>We introduce high-performance polyaniline (PANI) nanocomposite supercapacitors based on gamma aluminum oxide (γ-Al<SUB>2</SUB>O<SUB>3</SUB>) and gamma iron (III) oxide (γ-Fe<SUB>2</SUB>O<SUB>3</SUB>) nanoparticles with a high specific surface area. PANI and its polymer nanocomposites are synthesized <I>via in situ</I> electropolymerization on gold electrodes. The structures and morphologies are characterized by cyclic voltammetry, FT-IR spectroscopy, SEM, TEM, and EDX. The electrochemical properties and specific surface area of the electrodes are investigated by galvanostatic charge–discharge, electrochemical impedance spectroscopy (EIS) and BET theory. The enhanced specific capacitance with higher surface area and conductivities is observed in PANI/γ-Fe<SUB>2</SUB>O<SUB>3</SUB> (342F/g), PANI/γ-Al<SUB>2</SUB>O<SUB>3</SUB> (292F/g) and PANI (180F/g) electrodes with a constant current density of 1A/g. The cyclic performance of the PANI electrodes following 8000cycles of operations were at 87% (PANI), 91% (PANI/γ-Al<SUB>2</SUB>O<SUB>3</SUB>), and 93% (PANI/γ-Fe<SUB>2</SUB>O<SUB>3</SUB>) of their initial capacitance. In addition, higher specific capacitances, higher conductivity and cyclic self-stabilities observed for the PANI/nanocomposite electrodes can provide new opportunities in the field of energy storage and supercapacitor applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PANI with γ-Al<SUB>2</SUB>O<SUB>3</SUB> and γ-Fe<SUB>2</SUB>O<SUB>3</SUB> supercapacitors were fabricated. </LI> <LI> Samples were characterized by <I>in situ</I> method, FT-IR, SEM, EDX, TEM, BET and EIS. </LI> <LI> Charging-discharging behavior of the electrodes was investigated. </LI> <LI> The specific capacitance values of PANI/nanocomposites were higher than that of PANI. </LI> <LI> Polymer nanocomposites show higher surface area and stability with long cycle life. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Arjomandi, Jalal,Lee, Jin Yong,Ahmadi, Fatemeh,Parvin, Mohammad Hadi,Moghanni-Bavil-Olyaei, Hamed Elsevier 2017 ELECTROCHIMICA ACTA Vol.251 No.-
<P><B>Abstract</B></P> <P>Polypyrrole (PPy) and polypyrrole-based gamma aluminum oxide (γ-Al<SUB>2</SUB>O<SUB>3</SUB>) and gamma iron (III) oxide (γ-Fe<SUB>2</SUB>O<SUB>3</SUB>) nanocomposites were synthesized via <I>in situ</I> electropolymerization methods Films were characterized via cyclic voltammetry (CV) and <I>in situ</I> spectroelectrochemistry methods such as <I>in situ</I> UV–Visible spectroscopy and <I>in situ</I> conductivity measurements. Polymer nanocomposite structures and morphologies were studied and characterized via Fourier transform infrared (FT-IR) spectroscopy, electrochemical impedance spectroscopy (EIS), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). According to the CV results of the nanocomposites, the separation of anodic and cathodic peak potential of the redox couples (ΔE) exhibited good reversibility with a positive potential shift compared with PPy during redox sweeps. The electrochemical properties of PPy, PPy/γ-Fe<SUB>2</SUB>O<SUB>3,</SUB> and PPy/γ-Al<SUB>2</SUB>O<SUB>3</SUB> nanocomposite electrodes in a solution of H<SUB>2</SUB>SO<SUB>4</SUB> were studied via CV, galvanostatic charge–discharge, and EIS measurements to understand the pseudocapacitance that formed due to oxidation and reduction reactions over the double layer capacitance. Results for the nanocomposites revealed that they were very good candidates for supercapacitor applications, with higher specific capacitances, cyclic self-stabilities, and better rate capabilities than those of PPy films. The specific capacitance values of PPy/γ-Fe<SUB>2</SUB>O<SUB>3</SUB> (106F/g) and PPy/γ-Al<SUB>2</SUB>O<SUB>3</SUB> (92F/g) nanocomposites based on a three-electrode cell configuration from galvanostatic charge–discharge at a constant current density of 1A/g were higher than that for PPy (75F/g).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Polypyrrole based γ-Al<SUB>2</SUB>O<SUB>3</SUB> and γ-Fe<SUB>2</SUB>O<SUB>3</SUB> nanocomposites were synthesized. </LI> <LI> The structure and morphology of the polymer nanocomposites were studied. </LI> <LI> Nanocomposites were characterized by <I>in situ</I> spectroelectrochemistry methods. </LI> <LI> PPy and polymer nanocomposites were applied as supercapacitor materials. </LI> <LI> The specific capacitance values of nanocomposites were higher than that of PPy. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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