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RISS 인기검색어
- 검색키워드
- 저자 : Ahmad Nozad (검색결과 3 건)
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Taher Yousefi,Ahmad Nozad Golikand,Mohammad Hossein Mashhadizadeh,Mustafa Aghazadeh 한국물리학회 2012 Current Applied Physics Vol.12 No.1
Manganese dioxide (MnO2) nanowires with diameter about 30e70 nm is achieved via a two-step process: first, template-free cathodic electrodeposition from aqueous solution of Mn(NO3)2 on steel substrate and followed by heat treatment. The temperature-annealed sample was studied by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM)methods and Fourier transform infrared (FT-IR) spectroscopy. The electrochemical performance of the MnO2 sample was studied by cyclic voltammetry (CV) and chronopotentiometry in Na2SO4 solutions. The sample showed excellent supercapacitive behavior. The specific capacitance (SC) of 237 F g-1 in a potential window of 0e0.9V was obtained at the scan rate of 2 mV s-1. The SC calculated from the chronopotentiometry data is about 246 F g-1. The SC was decreased by 16% after 1000 cycles. Manganese dioxide (MnO2) nanowires with diameter about 30e70 nm is achieved via a two-step process: first, template-free cathodic electrodeposition from aqueous solution of Mn(NO3)2 on steel substrate and followed by heat treatment. The temperature-annealed sample was studied by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM)methods and Fourier transform infrared (FT-IR) spectroscopy. The electrochemical performance of the MnO2 sample was studied by cyclic voltammetry (CV) and chronopotentiometry in Na2SO4 solutions. The sample showed excellent supercapacitive behavior. The specific capacitance (SC) of 237 F g-1 in a potential window of 0e0.9V was obtained at the scan rate of 2 mV s-1. The SC calculated from the chronopotentiometry data is about 246 F g-1. The SC was decreased by 16% after 1000 cycles.
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Taher Yousefi,Ahmad Nozad Golikand,Mohammad Hossein Mashhadizadeh,Mustafa Aghazadeh 한국물리학회 2012 Current Applied Physics Vol.12 No.2
Uniform and single-crystalline Mn3O4 nano-spheres were synthesized by cathodic electrodeposition at high temperature (80 ℃) and low current density (0.25 mA cm-1) on steel electrode. Further the annealed samples were characterized for their structural and morphological properties by means of Xray diffraction (XRD), Fourier transform infrared spectrum (FTIR), Scanning electron microscopy (SEM),Transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) studies. TEM and SEM images showed that particles have spherical shapes and the average diameter size was about 50 nm. Formation of Mn3O4 compound was confirmed from FTIR studies. The XRD pattern showed that the Mn3O4 exhibit tetragonal hausmannite structure. The results of N2 adsorption-desorption analysis indicated that Mn3O4 nanoesphere has BET surface area of about 177.6 m2 g-1 and average pore diameters of 3 and 4 nm. The possible formation mechanism of Mn3O4 nanostructures has been discussed. The supercapacitive properties of Mn3O4 sample in 0.5 M Na2SO4 electrolyte showed maximum supercapacitance of 235.4 Fg-1 at scan rate 10 mV s-1. Coulumbic efficiency could be kept about 90%during 1000 cycles at 10 mV s-1. Uniform and single-crystalline Mn3O4 nano-spheres were synthesized by cathodic electrodeposition at high temperature (80 ℃) and low current density (0.25 mA cm-1) on steel electrode. Further the annealed samples were characterized for their structural and morphological properties by means of Xray diffraction (XRD), Fourier transform infrared spectrum (FTIR), Scanning electron microscopy (SEM),Transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) studies. TEM and SEM images showed that particles have spherical shapes and the average diameter size was about 50 nm. Formation of Mn3O4 compound was confirmed from FTIR studies. The XRD pattern showed that the Mn3O4 exhibit tetragonal hausmannite structure. The results of N2 adsorption-desorption analysis indicated that Mn3O4 nanoesphere has BET surface area of about 177.6 m2 g-1 and average pore diameters of 3 and 4 nm. The possible formation mechanism of Mn3O4 nanostructures has been discussed. The supercapacitive properties of Mn3O4 sample in 0.5 M Na2SO4 electrolyte showed maximum supercapacitance of 235.4 Fg-1 at scan rate 10 mV s-1. Coulumbic efficiency could be kept about 90%during 1000 cycles at 10 mV s-1.
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Hamzeh Hoseinpour,Mohsen Jahanshahi,Majid Peyravi,Ahmad Nozad 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
A new acid stable copolyamide [PEI-Mel]-PA membrane was developed via interfacial polymerizationassisted by melamine. The physico-chemical properties and separation ability were studied. It wascompared with an acid stable polysulfonamide membrane in terms of acid stability. Melamine improvedthe thermal and acid stability and made the surface of the membrane more positively charged. Thedecreases in MgSO4 rejections were 56% and 31% for [PEI-Mel]-PA membrane after H2SO4 and HNO3treatment, respectively. The stability of [PEI-Mel]-PA improved up to 16% and 48% in H2SO4 and HNO3,respectively in comparison with PEI-PA membrane. It recovered more than 97% of the acid.
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