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Chronopotentiometric Deposition of Nanocobalt Oxide for Electrochromic Auxiliary Active Electrode Application
Author(s) -
Pathak Devesh K.,
Chaudhary Anjali,
Tanwar Manushree,
Goutam Uttam K.,
Pfnür Herbert,
Kumar Rajesh
Publication year - 2020
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202000173
Subject(s) - electrochromism , electrode , auxiliary electrode , materials science , oxide , opacity , optoelectronics , inorganic chemistry , chemistry , optics , metallurgy , physics , electrolyte
A dense nanofilm of Co 3 O 4 is synthesized using constant current electrodeposition on a conducting transparent electrode that works not only as a counter electrode but also shows electrochromic (EC) properties on its own. The isolated active nano‐Co 3 O 4 electrode shows reduction in the redox potential and good color contrast between its yellowish transparent and dark states at different bias conditions. The electrode shows improved color contrast, stability, and cycle life. In situ spectroelectrochemical studies of the nanoelectrode reveals that the bias‐induced redox activity of the metal oxide leads to the color change between yellowish and opaque states. The bias‐induced color change makes it an active EC counter‐ion electrode for appropriate solid‐state EC devices.