Yazar "Nar, S." seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • [ X ]
    Öğe
    Al2 o3 supported co-cu-b (Co-cu-b/al2 o3 ) catalyst for hydrogen generation by hydrolysis of aqueous sodium borohydride (nabh4 ) solutions
    (S.C. Virtual Company of Phisics S.R.L, 2019) Baytar, O.; İzgi, M.S.; Horoz, S.; Şahin, Ö.; Nar, S.
    In this study, Al2O3 supported Co-Cu-B (Co-Cu-B/Al2O3 ) catalyst was synthesized by chemical impregnation and precipitation method to be used for catalytic hydrogen generation from NaBH4. Co-Cu-B/Al2O3 catalyst was synthesized at various ratios using Co-Cu-B/Al2O3 (5-20%). The effect of some parameters such as NaOH concentration (0-7%), NaBH4 concentration (2.5-7.5%), catalyst amount (25-150 mg) and solution ambient temperature was investigated on the catalytic hydrolysis of NaBH4. The hydrogen generation rate was found as 2519 and 8962 mL*g-1 *min-1 for Co-Cu-B and Co-Cu-B/Al2O3 catalysts in NaBH4 hydrolysis, respectively. The order rate kinetics and activation energy for Co-Cu-B/Al2 O3 catalyst were determined as 0.125 and 27 kJ*mol-1, respectively. The obtained results suggest that Co-Cu-B/Al2O3 catalysts can be used for mobile applications of PEMFC systems. © S.C. Virtual Company of Phisics S.R.L. All rights reserved.
  • [ X ]
    Öğe
    Al2O3 SUPPORTED Co-Cu-B (Co-Cu-B/Al2O3) CATALYST FOR HYDROGEN GENERATION BY HYDROLYSIS OF AQUEOUS SODIUM BOROHYDRIDE (NaBH4) SOLUTIONS
    (Inst Materials Physics, 2019) Baytar, O.; Izgi, M. S.; Horoz, S.; Sahin, O.; Nar, S.
    In this study, Al2O3 supported Co-Cu-B (Co-Cu-B/Al2O3) catalyst was synthesized by chemical impregnation and precipitation method to be used for catalytic hydrogen generation from NaBH4. Co-Cu-B/Al2O3 catalyst was synthesized at various ratios using Co-Cu-B/Al2O3 (5-20%). The effect of some parameters such as NaOH concentration (0-7%), NaBH4 concentration (2.5-7.5%), catalyst amount (25-150 mg) and solution ambient temperature was investigated on the catalytic hydrolysis of NaBH4 . The hydrogen generation rate was found as 2519 and 8962 mL*g(-1)*min(-1) for Co-Cu-B and Co-CuB/Al2O3 catalysts in NaBH4 hydrolysis, respectively. The order rate kinetics and activation energy for Co-Cu-B/Al2O3 catalyst were determined as 0.125 and 27 kJ*mol(-1), respectively. The obtained results suggest that Co-Cu-B/Al2O3 catalysts can be used for mobile applications of PEMFC systems.
  • [ X ]
    Öğe
    DETERMINATION OPTIMUM Ni CONCENTRATION IN Zn2SnO4/Ni-DOPED Sb2S3 THIN FILMS WITH DIFFERENT Ni CONCENTRATIONS USING INCIDENT PHOTONS TO CURRENT EFFICIENCY (IPCE) AND CURRENT DENSITY (J) - VOLTAGE (V) MEASUREMENTS
    (Natl Inst R&D Materials Physics, 2018) Nar, S.; Sahin, O.; Horoz, S.
    In this present study, Ni-doped Sb2S3 thin films with different Ni concentrations were synthesized on Zn(2)Sna(4) coated with FTO conductive glasses by CBD method at room temperature using Ni as the dopant material. The concentration of Ni to be doped during the experiment was determined as 0.25%, 0.5%, 0.75%, and 1%. In the first stage of this study, incident photons to current efficiency (IPCE) and current density (J) - voltage (V) measurements were conducted to investigate the photovoltaic properties of Zn(2)Sna(4)/Nidoped Sb2S3 thin films with different Ni concentrations for the first time. The main reason for performing IPCE and J-V measurements is to determine Ni-doped Sb2S3 thin film with optimum Ni concentration with the best solar cell performance. It was found that Sb2S3: Ni(0.75%) thin film has the highest IPCE (%) and power conversion efficiency values compare to other Ni concentrations.
  • [ X ]
    Öğe
    Determination optimum ni concentration in Zn2SnO4/Ni-Doped Sb2S3 thin films with different ni concentrations using incident photons to current efficiency (IPCE) and current density (J)-voltage (V) measurements
    (S.C. Virtual Company of Phisics S.R.L, 2018) Nar, S.; Sahin, O.; Horoz, S.
    In this present study, Ni-doped Sb2S3 thin films with different Ni concentrations were synthesized on Zn2SnO4 coated with FTO conductive glasses by CBD method at room temperature using Ni as the dopant material. The concentration of Ni to be doped during the experiment was determined as 0.25%, 0.5%, 0.75%, and 1%. In the first stage of this study, incident photons to current efficiency (IPCE) and current density (J)-voltage (V) measurements were conducted to investigate the photovoltaic properties of Zn2SnO4 /Ni-doped Sb2S3 thin films with different Ni concentrations for the first time. The main reason for performing IPCE and J-V measurements is to determine Ni-doped Sb2S3 thin film with optimum Ni concentration with the best solar cell performance. It was found that Sb2S3: Ni(0.75%) thin film has the highest IPCE (%) and power conversion efficiency values compare to other Ni concentrations. © 2018, S.C. Virtual Company of Phisics S.R.L. All rights reserved.