Physicochemical identity and charge storage properties of battery-type nickel oxide material and its composites with activated carbon
2016 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 194, 480-488 p.Article in journal (Refereed) PublishedText
The structural properties of annealed nickel oxide and its composites with activated carbon (synthesized via simple precipitation methods) have been addressed using X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption/desorption method and scanning electron microscopy. The charge storage properties of materials have also been investigated in three-and two-electrode configurations by means of cyclic voltammetry and galvanostatic charging/discharging in alkaline media. The results are consistent with the view that, depending on a method of preparation, the resulting nickel oxide films may exhibit redox characteristics different from that typically observed for nickel oxide-based materials. It is demonstrated that faradaic-type (redox) reactions, that are typical for battery-like materials, contribute predominantly to the high electrode capacity of 257C g(-1) (at 0.1 A g(-1)). By combining nickel oxide with a capacitive material such as activated carbon within the two-electrode symmetric cell, systems with increased charge-storage capabilities have been obtained. The fact, that the voltage window of nickel oxide-based cell has been broadened positively from 0.6 V to 1 V upon introduction of activated carbon, has also resulted in the increase of the cell's energy and power densities as well.
Place, publisher, year, edition, pages
2016. Vol. 194, 480-488 p.
battery-type material, double layer capacitance, nickel oxide, nickel oxide/activated carbon composite, charge capacity, two- and three-electrode configuration
IdentifiersURN: urn:nbn:se:uu:diva-288598DOI: 10.1016/j.electacta.2016.01.185ISI: 000372523300054OAI: oai:DiVA.org:uu-288598DiVA: diva2:926088
FunderSwedish Energy AgencyStandUpSwedish Research CouncilKnut and Alice Wallenberg Foundation