Dizajn, priprava i testiranje superkondenzatora na bazi ugljika

master's thesis

• Title (english): Design, preparation and testing of carbon-based supercapacitors
• Author: Jurica Bunjevac
• Mentor: Zoran Mandić (mentor)
• Committee member: Zoran Mandić (predsjednik povjerenstva)
• Committee member: Davor Antonić (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2016-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Analysis, Synthesis and Management of Chemical Processes

Abstract

U ovom radu konstruirani su elektrokemijski kondenzatori na temelju električnog dvosloja. Kao elektrodni materijal korišten je aktivni ugljik visoke specifične površine 1600 m^2/g pomiješan sa polimernim vezivom PVDF i acetilenskim crnilom. Kao podloga upotrijebljen je strujni kolektor od aluminija različite površinske finoće, dok je elektrolit bio 0,5 M Na2SO4 a membrana od staklastih vlakana je imala ulogu separatora. Priređeni kondenzatori testirani su metodama cikličke voltametrije te metodom punjenja i pražnjenja konstantnom strujom kroz 500 ciklusa. Rezultati pokazuju da karakteristike priređenih superkondenzatora (specifični kapacitet, specifična energija i snaga te unutarnji otpor) ovise o sastavnim elementima superkondenzatora. Najbolji rezultati dobiveni su kod superkondenzatora čiji je strujni kolektor od aluminija izbrušen na finoću 240, ima dodatni PVDF premaz te je elektrodni materijal sušen na 60 °C. Specifični kapacitet u tom slučaju iznosio je 153,68 Fg^-1, specifična energija 110,64 Ws/g, a specifična snaga 0,037 W/g. Ove vrijednosti pokazuju da osim elektrodnog materijala, na kapacitivna svojstva superkondenzatora može se utjecati i obradom strujnog kolektora i samim načinom pripreme elektroda.

Abstract (english)

In this work electrochemical capacitors based on the electric double layer were designed and constructed. Activated carbon of high specific surface area of 1600 m^2/g mixed with polymeric binder PVDF and acetylene ink were used as active electrode material. As a substrate current collector made of aluminum different surface fineness was used, while the electrolyte was 0.5 M Na2SO4 and membranes of glassy fibers acted as separators. Prepared capacitors were tested using methods of cyclic voltammetry and method of charging and discharging with constant current through 500 cycles. The results show that the characteristics of the prepared supercapacitor (specific capacity, specific energy and power, and internal resistance) depend on the constructional elements of the supercapacitor. The best results were obtained with a capacitor whose current collector of aluminum was polished to a fineness of 240, had an extra coating of PVDF and the electrode material is dried at 60 °C. Specific capacity in this case amounted to 153.68 F^g-1 and specific energy 110,64 Ws/g and power 0,037 W/g. These figures show that in addition to the electrode material, the capacitive properties of supercapacitors can affect the processing of the current collectors and electrodes by way of preparation.

• Keywords: elektrokemijski kondenzator; aktivni ugljik; aluminijski strujni kolektor; vodeni elektrolit; polimerni premaz
• Keywords (english): electrochemical capacitor; activated carbon; aluminum current collector; water electrolyte; polymer coating
• Language: croatian
• URN:NBN: urn:nbn:hr:149:285133
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-10-31 12:55:31