Cyclic voltammetry on sputter-deposited films of electrochromic Ni oxide: Power-law decay of the charge density exchange

Journal Article · Mon Oct 20 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4899069· OSTI ID:22350988

Wen, Rui-Tao; Granqvist, Claes G.; Niklasson, Gunnar A. ^[1]

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1. Department of Engineering Sciences, The A°ngström Laboratory, Uppsala University, P. O. Box 534, SE-75121 Uppsala (Sweden)

Ni-oxide-based thin films were produced by reactive direct-current magnetron sputtering and were characterized by X-ray diffraction and Rutherford backscattering spectroscopy. Intercalation of Li{sup +} ions was accomplished by cyclic voltammetry (CV) in an electrolyte of LiClO{sub 4} in propylene carbonate, and electrochromism was documented by spectrophotometry. The charge density exchange, and hence the optical modulation span, decayed gradually upon repeated cycling. This phenomenon was accurately described by an empirical power law, which was valid for at least 10{sup 4} cycles when the applied voltage was limited to 4.1 V vs Li/Li{sup +}. Our results allow lifetime assessments for one of the essential components in an electrochromic device such as a “smart window” for energy-efficient buildings.

• OSTI ID: 22350988
• Journal Information: Applied Physics Letters, Vol. 105, Issue 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHARGE DENSITY
CHARGES
CLATHRATES
DIRECT CURRENT
ELECTRIC POTENTIAL
ELECTROCHROMISM
ELECTROLYTES
LIFETIME
LITHIUM IONS
LITHIUM PERCHLORATES
MAGNETRONS
NICKEL OXIDES
RUTHERFORD BACKSCATTERING SPECTROSCOPY
SPECTROPHOTOMETRY
SPUTTERING
THIN FILMS
VOLTAMETRY
X-RAY DIFFRACTION