Strongly Improved Electrochemical Cycling Durability by Adding Iridium to Electrochromic Nickel Oxide Films
2015 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 18, 9319-9322 p.Article in journal (Refereed) Published
Anodically colored nickel oxide (NiO) thin films :are of much interest as counter electrodes in tungsten oxide based electrochromic devices such as "smart windows" for energy-efficient buildings. However, NiO films are prone to Suffering severe charge density degradation upon prolonged electrochemical cycling, which can lead to insufficient device lifetime. Therefore, a means to improve the durability of NiO-based films is an important challenge at present. Here we report that the incorporation of a modest amount of iridium into NiO films [Ir/(Ir + Ni) = 7.6 atom %] leads to remarkable durability, exceeding 10000 cycles in a lithium-conducting, electrolyte, along with significantly improved optical modulation during extended cycling. Structure characterization showed that the face-centered-cubic-type NiO structure remained after iridium addition. Moreover, the crystallinity of these films was enhanced upon electrochemical cycling.
Place, publisher, year, edition, pages
2015. Vol. 7, no 18, 9319-9322 p.
electrochromic, iridium-nickel oxide, improved durability, charge density, optical modulation
IdentifiersURN: urn:nbn:se:uu:diva-256240DOI: 10.1021/acsami.5b01715ISI: 000354906500002PubMedID: 25919917OAI: oai:DiVA.org:uu-256240DiVA: diva2:826080
FunderEU, European Research Council, 267234