Naslov
Utjecaj temperature predobrade na elektrokemijska svojstva hidratiziranog RuO2
(Effect of the temperature pre-treatment on electrochemical properties of hydrous RuO2)

Autori
Sopčić, Suzana ; Kiseljak ; Marija ; Mandić, Zoran ; Kraljić Roković, Marijana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
XXII. Hrvatski skup kemičara i kemijskih inženjera - Knjiga Sažetaka / Tomašić, Vesna ; Maduna Valkaj, Karolina - Zagreb, 2011, 283-283

ISBN
978-953-6894-42-0

Skup
XXII. Hrvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Zagreb, Hrvatska, 13.02.2011. - 16.02.2011

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
RuO2; Superkondenzator; EQCN; utjecaj temperature
(RuO2; Supercapacitors; EQCN; Temperature effect)

Sažetak
The electrochemical reaction of ruthenium oxide exhibits a capacitive-like behavior, which means that it achieves high currents over a wide potential range. It also has very reversible and reproducible electrochemical behavior, the capability to store very high charge and to release it fast enough upon demand as well as capability to be oxidized and reduced several thousands times without significant chemical or mechanical change. Because of these properties, ruthenium oxide has potential applications as an electrode material in supercapacitors. The overall charging/discharging reaction of ruthenium oxide can be generally represented by equation [1]: RuOx(OH)y + ze- + zH+ -----> RuOx-z(OH)y+z Pseudocapacitance reaction of hydrous ruthenium oxide was investigated by cyclic voltammetry combined with electrochemical quartz-crystal microbalance (EQCM) in H2SO4 and Na2SO4 electrolyte solutions. The ruthenium oxide electrode was prepared by attaching the ruthenium oxide particles on gold covered quartz electrode and was heated at various temperatures. From given reaction it can be concluded that both electronic conductivity and proton availability are necessary for good performance of ruthenium oxide in supercapacitor applications. These two conductivities were regulated by temperature pre- treatment of hydrous ruthenium oxide. The results show that there are at least three different processes taking place simultaneously during the redox reaction of ruthenium oxide electrode, but their contribution vary depending on the electrolyte used, temperature pre-treatment and potential range. The influence of the annealing temperatures on the characteristics of the redox reaction of hydrous ruthenium oxide as well as on its capacitance was confirmed.

Izvorni jezik
Hrvatski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

POVEZANOST RADA