Slide 1.pngSlide 2.pngSlide 3.pngSlide 4.pngSlide 5.pngSlide 6.png

Dr. Farshad Barzegar

Centre for New Energy Studies (CNES), University of Pretoria, South Africam

 

Talk Title
Three dimensional modelling of electrochemical capacitors (Supercapacitors)

Talk Abstract
 

Storage systems with sufficient capacity and highly efficient charge and discharge characteristics are important for portable electronic, biomedical applications, as well as short and medium-term stationary applications. Advanced solutions with high energy densities are batteries, however, they suffer from low power density, a short cycle life, safety risks and poor adaptability with flexible systems. Electrochemical capacitors (ECs) also called supercapacitors (SCs) with high power density, good cycling stability, and fast charge-discharge rate are new energy storage devices that have attracted attention in the scientific community. Currently, research in the field of supercapacitors is focused on fine-tuning electrode, electrolyte and material section to achieve the best performance. However, there are no studies on the effect of the resistance of each parameter on final electrochemical performance which can help researchers to develop and fabricate the best ECs depending on the usage. Until now most researchers have tried to explain the electrical behaviour of the pure EDLCs for ECs, however, none of the reports clearly explained effect and reflection of each component of the ECs on their behaviour leading to the final stored energy. In this study, we provide a deep understanding and study the electrical behaviour of ECs and the effect of each component to the final electrochemical performance.

Three dimension (3D) modelling of supercapacitors (SCs) has been investigated for the first time. Based on this model, the resistance of the electrolyte, membrane, current collectors and active materials, have an effect on the first intersection point on the real axis (x-axis) of the Nyquist plots (equivalent series resistance (ESR)). These results indicate inward shrinking of the cyclic voltammograms (CV) due to a small change in the leakage resistance and resistance of the faradic component of materials, it also explains the parameters that lead to the deformation of the CV from the ideal behaviour. The 3D model was verified with experiments using activated carbon-based SCs devices. The experimental results confirmed the 3D model results and suggest that the proposed 3D model is reliable and can be used for the proper design of SC devices.

Short Biography

Dr. Farshad Barzegar obtained his MSc and PhD from University of Pretoria, in 2014 and 2016, respectively, with a focus on Nano-fibers and nanostructured materials for energy storage applications. In his doctoral studies, he worked extensively on carbon and other relevant materials for improved energy storage applications and have acquired exceptional skills in materials synthesis, characterization and device fabrication. As a follow-up to that, he was offered a postdoctoral fellowship in the physics department where he continued in the same area of application. Since then, he have joined the Centre for New Energy Studies (CNES) at the Department of Electrical, Electronic & Computer Engineering at University of Pretoria, as Senior Researcher. His work there involves researching into new hybrid energy storage device that can solve the energy efficiency and energy storage challenges we face at moment. The outcomes of these studies have resulted in a number of publications published in prestigious journals in the field. He authored and co-authored over 39 papers with h-index 14.

 
Talk Keywords
Supercapacitors; Electrochemical capacitors; Modelling of supercapacitors.
 
Target Audience
Students, Post doctoral, Industry, Doctors and professors
 
Speaker-intro video
TBA 
 

The International Conference on Innovative Applied Energy (IAPE’18)