Electrochromic Iridium-Containing Nickel Oxide Films with Excellent Electrochemical Cycling Performance. Issue 2 (24th November 2015)

• Record Type: Journal Article
• Authors: Wen, Rui-Tao; Niklasson, Gunnar A.; Granqvist, Claes G.
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 2(2016)
• Page Start: E7
• Page End: E13
• Publication Date: 2015-11-24
• Subjects: durability -- Electrochromic -- Ir-Ni oxide -- thin films; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0591602jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Electrochromic Ni oxide thin films attract much interest because of their large potential for applications as optically active layers in energy-saving and comfort enhancing smart windows in buildings. However Ni oxide, typically being the anodic counter electrode in a W-oxide-based device, may suffer severe charge capacity degradation upon extended electrochemical cycling. It is therefore important to identify improved Ni-oxide-based thin films for electrochromics. Here we describe a new class of such films wherein an addition of a small amount of Ir to Ni oxide is found to provide strongly improved electrochemical cycling durability. Best properties were achieved with Ir/(Ir + Ni) = 7.6%, and such films displayed charge capacity and optical modulation that, remarkably, were still increasing after 10, 000 cycles.