Elektrokemijska svojstva komercijalnog i pripravljenog superkondenzatora

undergraduate thesis

• Title (english): Electrochemical properties of commercial and self-assembled supercapacitor
• Author: Dajana Balaić
• Mentor: Zoran Mandić (mentor)
• Committee member: Zoran Mandić (predsjednik povjerenstva)
• Committee member: Helena Otmačić Ćurković (član povjerenstva)
• Committee member: Petar Kassal (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-09-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Zadatak ovog rada je testirati komercijalno dostupan superkondenzator te pripremiti i testirati superkondenzator od aktivnog ugljika. Cilj rada je usporediti ponašanje komercijalno dostupnog superkondenzatora i pripremljenog superkondenzatora te usporediti njihovo ponašanje s ponašanjem idealnog superkondenzatora. Oba superkondenzatora testirala su se cikličkom voltametrijom, galvanostatskim punjenjem/pražnjenjem te elektrokemijskom impedancijskom spektroskopijom. Ciklička voltametrija provodila se u rasponu potencijala od 0,050 V do 2,500 V uz brzinu promjene potencijala od 20 mV s^-1 s tri ponavljanja. Galvanostatsko punjenje/pražnjenje provodilo se pri konstantnoj struji od ±100 mA za komercijalni superkondenzator uz 100 ponavljanja te od ±10 mA za pripremljeni superkondenzator uz 99 ponavljanja. Elektrokemijska impedancijska spektroskopija provodila se na 0,050 V, 1,250 V i 2,500 V u području frekvencija 50 kHz -100 mHz uz 6 točaka po dekadi i amplitudu izmjeničnog napona od 20 mV. Komercijalni superkondenzator pokazao je puno manji unutarnji otpor od pripremljenog superkondenzatora. Oba superkondenzatora pokazala su tipično kapacitivno ponašanje i utvrdilo se postojanje diferencijalnog kapaciteta. Kod komercijalnog superkondenzatora najsporiji stupanj u procesu nabijanja i izbijanja je difuzija iona, a kod pripremljenog superkondenzatora najsporiji stupanj je prijelaz naboja, odnosno vidljiv je kinetički efekt.

Abstract (english)

The assignment in this paper was to test commercially available supercapacitor and to prepare and test supercapacitor assembled in the lab from the active carbon as an electrode component. The aim of this paper was to compare the electrochemical properties of a commercially available supercapacitor and a prepared supercapacitor with the behaviour of an ideal supercapacitor. Both supercapacitors were tested by cyclic voltammetry, galvanostatic charging/discharging and electrochemical impedance spectroscopy. Cyclic voltammetry was performed in the potential range from 0,050 V to 2,500 V at scan rate of
20 mV s^-1 with three repetition cycles. Galvanostatic charging/discharging was performed at a constant current of ±100 mA for a commercial supercapacitor with 100 repetition cycles and at the current of ±10 mA for a prepared supercapacitor with 99 repetition cycles. Electrochemical impedance spectroscopy was performed at 0,050 V, 1,250 V and 2,500 V in the frequency range 50 kHz -100 mHz with 6 points per decade and an amplitude of alternating voltage of 20 mV. Commercial supercapacitor showed much lower internal resistance than the prepared supercapacitor. Both supercapacitors showed typical capacitive behaviour and the existence of differential capacitance was identified. The slowest stage in the charging and discharging process for commercial supercapacitor is the diffusion of ions. For the prepared supercapacitor the slowest stage is charge transfer visible as kinetic effects.

• Keywords: superkondenzator; ciklička voltametrija; galvanostatsko punjenje/pražnjenje; elektrokemijska impedancijska spektroskopija
• Keywords (english): supercapacitor; cyclic voltammetry; galvanostatic charging/discharging; electrochemical impedance spectroscopy
• Language: croatian
• URN:NBN: urn:nbn:hr:149:777062
• Project: Number: IP-2013-11-8825; Title: Elektrokemijski superkondenzator visoke snage i velikog sadržaja energije za primjenu u električnim vozilima; Title: High power-high energy electrochemical supercapacitor for hybrid electric vehicles; Acronym: ESUP-CAP; Leader: Zoran Mandić; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Materials Science and Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2023-05-02 10:20:12