Influence of nanocrystalline nickel powder on oxidation resistance of spark plasma sintered Ni-17Cr6.5Co1.2Mo6Al4W7.6Ta alloy
- Authors: Babalola, Bukola Joseph , Maledi, Nthabiseng , Shongwe, Mxolisi Brendon , Bodunrin, Michael Oluwatosin , Obadele, Babatunde Abiodun , Olubambi, Peter Apata
- Date: 2020
- Subjects: Nickel based superalloy , Nanostructured , Spark plasma sintering
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/453453 , uj:40033 , Citation: Babalola, B.J. et al. 2020. Influence of nanocrystalline nickel powder on oxidation resistance of spark plasma sintered Ni-17Cr6.5Co1.2Mo6Al4W7.6Ta alloy. , DOI: https:// doi.org/10.1016/j.jksues.2019.01.002
- Description: Abstract: An investigation was carried out to evaluate the isothermal oxidation behavior of nickel based superal- loys at 1100 °C for 120 h. The alloys which were microstructured and nanostructured were developed by spark plasma sintering system. The oxidation test was carried out at a temperature of 1100 °C in air at different exposure time up to 120 h. The nanostructured nickel based alloy possessed better oxidation resistance with the formation of continuous adherent alumina, chromia scales, and spinel on the alloy surface and with no significant internal oxides. The oxidation rate of NiO was observed to be lower in the nanostructured nickel superalloy due to low diffusion rate of Nickel. The oxidation kinetics followed a parabolic oxidation law.
- Full Text:
Numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS
- Authors: Ukoba, Kingsley , Imoisili, Patrick Ehi , Jen, Tien-Chien
- Date: 2020
- Subjects: Cu2O , Performance , Nanostructured
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/438876 , uj:38163 , Citation: Ukoba, K., Imoisili, P.E. & Jen, T.C. 2020. Numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS.
- Description: Abstract: This paper reported numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells. Metal oxides thin films including Copper oxides are promising materials for photovoltaic applications. Although, the efficiency is still lower than other solar cells materials. This paper focused on improving the efficiency of Cu2O/TiO2 solar cells using SCAPS simulation tool. This was done by varying the effect of film surface thickness and effect of varying deposition temperature on the solar cells. The aim of the study is to serve as a theoretical guide for laboratory research on the improvement of efficiency of Cu2O metal oxide solar cells. The solar cells equations were modelled and thereafter theoretical validation of the nanostructured metal oxides was performed. The model working points input power of 100 mW/m2 using an illumination of AM1.5 lamp. The modelled solar cell exhibits a short-circuit current (Jsc) of 26.57 mA/cm2, 0.7188 V open-circuit voltage (Voc), fill factor (FF) of 70, and 13.37% efficiency (η). A value of 2.30 eV was recorded for the band gap. Also, electron affinity and Nyquist plot were obtained for the solar cells. Solar cells with thin absorber surface thickness will result in lower fabrication cost. This will open a new frontier for modelling of metal oxide based thin films solar cells especially Cu2O thin films solar cells.
- Full Text:
Numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS
- Authors: Ukoba, Kingsley , Imoisili, Patrick Ehi , Jen, Tien-Chien
- Date: 2020
- Subjects: Cu2O , Performance , Nanostructured
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/461582 , uj:41118 , Citation: Kingsley, U., Imoisili, P.E. & Jen, T-C. 2020. Numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells using SCAPS. DOI:
- Description: Abstract: This paper reported numerical analysis and performance improvement of nanostructured Cu2O/TiO2 pn heterojunction solar cells. Metal oxides thin films including Copper oxides are promising materials for photovoltaic applications. Although, the efficiency is still lower than other solar cells materials. This paper focused on improving the efficiency of Cu2O/TiO2 solar cells using SCAPS simulation tool. This was done by varying the effect of film surface thickness and effect of varying deposition temperature on the solar cells. The aim of the study is to serve as a theoretical guide for laboratory research on the improvement of efficiency of Cu2O metal oxide solar cells. The solar cells equations were modelled and thereafter theoretical validation of the nanostructured metal oxides was performed. The model working points input power of 100 mW/m2 using an illumination of AM1.5 lamp. The modelled solar cell exhibits a short-circuit current (Jsc) of 26.57 mA/cm2, 0.7188 V open-circuit voltage (Voc), fill factor (FF) of 70, and 13.37% efficiency (η). A value of 2.30 eV was recorded for the band gap. Also, electron affinity and Nyquist plot were obtained for the solar cells. Solar cells with thin absorber surface thickness will result in lower fabrication cost. This will open a new frontier for modelling of metal oxide based thin films solar cells especially Cu2O thin films solar cells.
- Full Text: