Sri Lankan Journal of Physics最新文献_第4页

Zn rechargeable cell with a gel polymer electrolyte based on an ionic liquid 具有基于离子液体的凝胶聚合物电解质的锌可充电电池

Sri Lankan Journal of Physics Pub Date : 2017-12-27 DOI: 10.4038/SLJP.V18I0.8047

K. W. Prasadini, K. Perera, K. Vidanapathirana

{"title":"Zn rechargeable cell with a gel polymer electrolyte based on an ionic liquid","authors":"K. W. Prasadini, K. Perera, K. Vidanapathirana","doi":"10.4038/SLJP.V18I0.8047","DOIUrl":"https://doi.org/10.4038/SLJP.V18I0.8047","url":null,"abstract":"Lithium rechargeable cells based on liquid electrolytes have been used for numerous applications due to their high performance. At present, it has been identified the possible hazardous effects of those cells. As an alternative, much research is focused on non-lithium rechargeable cells based on Gel Polymer Electrolytes (GPEs). Basically, a GPE is consisted of a salt and solvent mixture entrapped inside a polymer network. However, these solvents are toxic and flammable. This imposes a limitation for the safety of GPEs. This paper, reported about a Zn rechargeable cell having a GPE based on an ionic liquid which eliminates the need of solvents. The polymer used was Poly-Vinylidene Fluoride co Hexa FluoroPropylene (PVdF-co-HFP). As the salt, Zinc Tri-Fluoromethanesulfonate (Zn(CF3SO3)2 – ZnTF) was used and 1 Butyl 3 Methyl Immidazolium Tri-Fluoromethanesulfonate (1B3MITF) was used as the Ionic Liquid (IL). It was observed that there is an optimum salt concentration that results the highest conductivity in IL. A Zn rechargeable cell was fabricated using the optimized composition of the GPE. It was observed that the cell is suitable for low power requirements.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"38 1","pages":"35"},"PeriodicalIF":0.0,"publicationDate":"2017-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73181478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Capacitive and Bioenzymevoltaic Characteristics of Photosynthetic Chromolena Odorata – Nanostructured Zinc Oxide System 光合作用下臭草-纳米氧化锌体系的电容性和生物酶光伏特性

Sri Lankan Journal of Physics Pub Date : 2017-10-17 DOI: 10.4038/SLJP.V18I0.8041

A. R. Obasuyi, A. B. Alabi, Emmanuel Dami Kajewole, O. Robert, F. Abejide, T. Adeleke, T. Akomolafe

{"title":"Capacitive and Bioenzymevoltaic Characteristics of Photosynthetic Chromolena Odorata – Nanostructured Zinc Oxide System","authors":"A. R. Obasuyi, A. B. Alabi, Emmanuel Dami Kajewole, O. Robert, F. Abejide, T. Adeleke, T. Akomolafe","doi":"10.4038/SLJP.V18I0.8041","DOIUrl":"https://doi.org/10.4038/SLJP.V18I0.8041","url":null,"abstract":"Zinc Oxide nanoparticles (ZnO) have been successfully synthesized by a chemical method at a low temperature of 60°C and dried at 80°C. The matching of the observed 2 q value with the JCPDS value of the XRD pattern showed that ZnO was synthesized. The pattern obtained showed high peaks as an indication of crystallinity at low temperature without annealing. The average grain size of the crystal obtained using Debye scherrer formular is 18.6 nm. The crystal structure lattice system is hexagonal wurzite structure. The SEM images obtained showed that the material is made up of agglomerated grains resulting in nanostructured islands. The direct optical band gap was obtained using Tauc’s relationship to be 2.4 eV. A bioenzymevoltaic cell was developed in form of a Dye Sensitized Solar Cell but with a photosynthetic material: Chromolaena Odorata acting as both the dye and the electrolyte. The short circuit current of 1.5 mA and open circuit voltage of 170 mV were obtained for the continuous and residual energy on the system. We found that the device exhibited a bio-capacitive effect, as the photosynthetic material generates electron and the energy is being stored in the system as much as 39 mA with a corresponding voltage of 196 mV.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"2 1","pages":"17"},"PeriodicalIF":0.0,"publicationDate":"2017-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86513635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Impact of Coronal Mass Ejection on different characteristic parameters of lower thermospheric region 日冕物质抛射对低层热层不同特征参数的影响

Sri Lankan Journal of Physics Pub Date : 2017-08-16 DOI: 10.4038/SLJP.V18I0.8035

S. Paul, S. S. De

引用次数: 0

Dirac particles in the field of Frost-Musulin diatomic potential and the thermodynamic properties via parametric Nikiforov-Uvarov method 用参数Nikiforov-Uvarov方法研究了Dirac粒子在Frost-Musulin双原子势场中的热力学性质

Sri Lankan Journal of Physics Pub Date : 2017-01-08 DOI: 10.4038/SLJP.V17I0.8027

C. Onate, M. Onyeaju

引用次数: 8

Polyvinylidene fluoride based gel polymer electrolyte to be used in solar energy to electrical energy conversion 聚偏氟乙烯基凝胶聚合物电解质应用于太阳能到电能的转换

Sri Lankan Journal of Physics Pub Date : 2017-01-08 DOI: 10.4038/SLJP.V17I0.8037

K. Perera, K. Vidanapathirana

引用次数: 4

Temperature dependent structural Phase transition in Lead Mono Hydrogen Aresenate crystal 铅单氢晶体的温度相关结构相变

Sri Lankan Journal of Physics Pub Date : 2017-01-08 DOI: 10.4038/SLJP.V17I0.8028

A. Rawat, A. Rawat, T. C. Upadhyay

引用次数: 1

A Cyclic Voltammetry study of a gel polymer electrolyte based redox-capacitor 凝胶聚合物电解质氧化还原电容器的循环伏安法研究

Sri Lankan Journal of Physics Pub Date : 2016-03-29 DOI: 10.4038/SLJP.V16I1.8026

C. Bandaranayake, W.A.D.S.S. Weerasinghe, K. Vidanapathirana, K. Perera

{"title":"A Cyclic Voltammetry study of a gel polymer electrolyte based redox-capacitor","authors":"C. Bandaranayake, W.A.D.S.S. Weerasinghe, K. Vidanapathirana, K. Perera","doi":"10.4038/SLJP.V16I1.8026","DOIUrl":"https://doi.org/10.4038/SLJP.V16I1.8026","url":null,"abstract":"This work describes the performance of a gel polymer electrolyte (GPE) based redox capacitor using the cyclic voltammetry technique.GPE was prepared with 22.5 wt% polyacrylonitrile (PAN), (1:1weight ratio) ethylene carbonate (EC) and propylene carbonate (PC) having a salt concentration of 1.0 M sodium iodide (NaI). Dependence of ionic conductivity of GPE on temperature was investigated using ac impedance spectroscopy. Two polypyrrole (PPy) electrodes were used as the electrodes of the redox capacitor. The performance of the device was evaluated by cyclic voltammetry. The redox-capacitors were cycled at different scan rates to determine the scan rate at which the maximum capacitance is obtained. After tracking that scan rate, continuous cycling was carried out at that scan rate to investigate the deterioration of capacitance upon cycling. The room temperature conductivity (σ) of the GPE was 4.29 × 10 -3 S cm -1 . The conductivity variation with temperature followed the Arrhenius behavior. From the scan rates selected for the study, the maximum capacity could be obtained at the scan rate of 30 mV s -1 . The average specific capacity of the redox capacitor was 26.70 Fg -1 .","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"88 1","pages":"19"},"PeriodicalIF":0.0,"publicationDate":"2016-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79382366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

Optical particle sensor based measurement and analysis of atmospheric aerosol number concentration of various sizes over a tropical region of Northern India 基于光学粒子传感器的印度北部热带地区不同大小大气气溶胶数浓度的测量和分析

Sri Lankan Journal of Physics Pub Date : 2016-03-24 DOI: 10.4038/SLJP.V16I1.7890

Adarsh Kumar

引用次数: 1

Mesoscale simulation of a flood producing rainstorm over Rangamati, Bangladesh using MM5 model 使用MM5模式在孟加拉国Rangamati产生洪水的暴雨的中尺度模拟

Sri Lankan Journal of Physics Pub Date : 2015-01-27 DOI: 10.4038/SLJP.V15I0.6824

M. Ahasan, M. Chowdhury, D. Quadir

{"title":"Mesoscale simulation of a flood producing rainstorm over Rangamati, Bangladesh using MM5 model","authors":"M. Ahasan, M. Chowdhury, D. Quadir","doi":"10.4038/SLJP.V15I0.6824","DOIUrl":"https://doi.org/10.4038/SLJP.V15I0.6824","url":null,"abstract":"Mesoscale simulation of a flood producing rainstorm of 21 June 2004 over Rangamati, Bangladesh has been carried out using the MM5 Model. The model performance was evaluated by examining the different predicted and model derived parameters. The MM5 model suggests that the rainstorm over Rangamati was resulted by the large scale weather circulation associated with active conditions of southwest summer monsoon over the head Bay of Bengal which generated favourable conditions for developing the severe mesoscale convections. The strong confluence of southwesterly low level flow transporting large amount of moisture (which vertically extended up to 350 hPa) from the Bay of Bengal towards southeast Bangladesh and its neighbourhoods appears to be one of the striking features. An elongated vorticity maximum of the order of 30-40×10 -5 s -1 was observed across the Rangamati. A well-defined area of low level convergence (-25×10 -5 s -1 ) is associated with strong divergence (25×10 -5 s -1 ) in the high level (200 hPa) has provided favourable conditions for strong convection. The model simulated realistic pattern of rainfall over Rangamati as compared with TRMM observations. Considering the quantitative comparison of the domain average rainfall with TRMM observations, it is found that the model over predicts by 12% as compared with TRMM observed rainfall.","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"27 1","pages":"31"},"PeriodicalIF":0.0,"publicationDate":"2015-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87741501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ionic conductivity of a PMMA based gel polymer electrolyte and its performance in solid state electrochemical cells PMMA基凝胶聚合物电解质的离子电导率及其在固态电化学电池中的性能

Sri Lankan Journal of Physics Pub Date : 2015-01-27 DOI: 10.4038/SLJP.V15I0.6638

Y. Jayathilake, K. Perera, K. Vidanapathirana, L. Bandara

{"title":"Ionic conductivity of a PMMA based gel polymer electrolyte and its performance in solid state electrochemical cells","authors":"Y. Jayathilake, K. Perera, K. Vidanapathirana, L. Bandara","doi":"10.4038/SLJP.V15I0.6638","DOIUrl":"https://doi.org/10.4038/SLJP.V15I0.6638","url":null,"abstract":"Gel polymer electrolytes are known to be very suitable for many electrochemical devices. They Gel polymer electrolytes are known to be very suitable for many electrochemical devices. They have been extensively studied for lithium based electrochemical cells. But, due to several drawbacks of lithium based cells such as safety issues, handling problems and toxicity, it is the time to develop non Li based cells. In this study, ionic conductivity of a gel polymer electrolyte (GPE) based on polymethylmethacrylate, ethylene carbonate, propylene carbonate and tetrapropylammonium iodide and its performance in an Mg / C: I 2 cell was investigated. GPE was prepared by varying salt concentration using hot pressed method and the composition, 20 PMMA / 30 EC / 30 PC / 40 Pr 4 N + I showed the highest conductivity of 5.02 x 10 -3 Scm -1 at 28 ° C. The cell in the form Mg / GPE / C+I 2 showed an average open circuit voltage of 1.9 V. The average short circuit current was 3.3 mA. It was possible to observe a good stability by the self discharge characteristics of the cell. DOI: http://dx.doi.org/10.4038/sljp.v15i0.6638 Sri Lankan Journal of Physics, Vol. 15 (2014) 11-17","PeriodicalId":21880,"journal":{"name":"Sri Lankan Journal of Physics","volume":"66 1","pages":"11"},"PeriodicalIF":0.0,"publicationDate":"2015-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91313975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8