Manganeso dioxidozko superkondentsadore hibridoen karakterizazio elektrokimikoa

Abstract

Ikerketa lan honetan superkondentsadore hibrido bat prestatu da, elektrodo positibo gisa manganeso dioxidoa erabiliz eta elektrodo negatibo moduan ikatz aktibatu komertzial bat. Horretarako hainbat egituratako manganeso dioxido lagin bi prestatu dira eta beraien karakterizazio fisiko-kimikoa eta elektrokimikoa burutu da hiru elektrolito akuoso desberdinetan: 1 M KOH, 0,5 M Na2SO4 eta 0,5 M Na2SO4 + 0,2 mM MnSO4. Ondoren, emaitza elektrokimiko onenak eman dituen laginarekin sistema hibrido finala eraiki da ikatz:MnO2 masa-balantze aproposa erabiliz 1 M KOH, eta 0,5 M Na2SO4 + 0,2 mM MnSO4 elektrolitoetan. Azken honetan lortu dira emaitzarik onenak, 15,6 Wh kg-1-eko energia dentsitatea lortuz 1 kW kg-1-eko potentzian. Hitz gakoak: Superkodentsadore hibridoa, energia metaketa, elektrokimika, elektrodo pseudokapazitiboa, manganeso dioxidoa.

In this research work, a hybrid supercapacitor has been prepared, using manganese dioxide as positive electrode and commercial activated carbon as negative electrode. Two manganese dioxide samples of different structure have been prepared and their physical-chemical and electrochemical characterization has been carried out in three different aqueous electrolytes: Then, the final hybrid system has been built with the sample that gave the best electrochemical results, using the most appropriate mass balance of AC:MnO2 and using the electrolytes 1 M KOH and 0,5 M Na2SO4 + 0.2 mM MnSO4. The best results were obtained in the latter, with an energy density of 15.6 Wh kg-1 at a power of 1 kW kg-1.