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A Nanostructured Electrochromic Supercapacitor
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DOI：10.1021/nl2042112.png)
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摘要
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We report the first successful application of an ordered bicontinuous double-gyroid vanadium pentoxide network in an electrochromic supercapacitor. The freestanding vanadia network was fabricated by electrodeposition into a voided block copolymer template that had self-assembled into the double-gyroid morphology. The highly ordered structure with 11.0 nm wide struts and a high specific surface to bulk volume ratio of 161.4 mu m(-1) is ideal for fast and efficient lithium ion intercalation/extraction and faradaic surface reactions, which are essential for high energy and high power density electrochemical energy storage devices. Supercapacitors made from such gyroid-structured vanadia electrodes exhibit a high specific capacitance of 155 F g(-1) and show a strong electrochromic color change from green/gray to yellow, indicating the capacitor's charge condition. The nanostructuring approach and utilizing an electrode material that has intrinsic electrochemical color-change properties are concepts that can be readily extended to other electrochrornic intercalation compounds.
Keyword:
Electrochromic supercapacitor
vanadium pentoxide
copolymer self-assembly
double-gyroid
nanostructured intercalation compound
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9.1
论文数:
2.7W
被引数:
16.5W
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