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Electrochromic Counter Electrode

National Renewable Energy Laboratory

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Technology Marketing Summary

 

Electrochromic materials change optical properties upon the injection of charge or charge carriers into the material, with the subsequent movement of counterions or electrons to balance the charge in the material. Optical changes in electrochromic materials include a change from one color to another, a change from transmissive to reflective, and a change from transparent to opaque. “Smart” windows, utilizing electrochromic films, provide substantial savings and increased comfort in buildings, cars, and airplanes. Ideally, these devices are comprised with two matched coloring layers; an anodic layer and a cathodic layer. An electrode that exhibits cathodic coloration combined with a counter electrode that has anodic coloration results in a more efficient and visually pleasing electrochromic device.

 

Description

 

Scientists at the National Renewable Energy Laboratory (NREL) have developed an amorphous material comprising nickel oxide doped with tantalum that is an anodically coloring electrochromic material. The material is prepared in the form of an electrode having a thin film of an electrochromic material residing on a transparent conductive film. The material invented is also incorporated into an electrochromic device as a thin film in conjunction with a cathodically coloring electrochromic material layer such that the devices contain both anodically coloring and cathodically coloring layers. The materials of the electrochromic layers in these devices exhibit broadband optical complimentary behavior, ionic species complimentary behavior, and coloration efficiency complimentary behavior in their operation.

 

Benefits

 

·        High coloration efficiency

·        Rapid switching speed

·        Robust reversibility

 

Applications and Industries

 

·        Electrochromic “smart” windows

·        Electrochromic mirrors

·        Electrochromic displays

 

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 6,859,297
Patent
6,859,297
Electrochromic counter electrode
The present invention discloses an amorphous material comprising nickel oxide doped with tantalum that is an anodically coloring electrochromic material. The material of the present invention is prepared in the form of an electrode (200) having a thin film (202) of an electrochromic material of the present invention residing on a transparent conductive film (203). The material of the present invention is also incorporated into an electrochromic device (100) as a thin film (102) in conjunction with a cathodically coloring prior art electrochromic material layer (104) such that the devices contain both anodically coloring (102) and cathodically coloring (104) layers. The materials of the electrochromic layers in these devices exhibit broadband optical complimentary behavior, ionic species complimentary behavior, and coloration efficiency complimentary behavior in their operation.
National Renewable Energy Laboratory 02/22/2005
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
NREL ROI 00-19DevelopmentAvailable01/28/201601/28/2016

Contact NREL About This Technology

To: Erin Beaumont<erin.beaumont@nrel.gov>