Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61404
Title: Suppressing the coffee-ring effect in semitransparent MnO2 film for a high-performance solar-powered energy storage window
Authors: Jin, H
Qian, J
Zhou, L 
Yuan, J 
Huang, H 
Wang, Y 
Tang, WM 
Chan, HLW 
Keywords: coffee-ring effect
Energy storage
Flexible
MnO2 film
Semitransparent
Issue Date: 2016
Publisher: American Chemical Society
Source: ACS applied materials and interfaces, 2016, v. 8, no. 14, p. 9088-9096 How to cite?
Journal: ACS applied materials and interfaces 
Abstract: We introduce a simple and effective method to deposit a highly uniform and semitransparent MnO2 film without coffee-ring effect (CRE) by adding ethanol into MnO2 ink for transparent capacitive energy storage devices. By carefully controlling the amount of ethanol added in the MnO2 droplet, we could significantly reduce the CRE and thus improve the film uniformity. The electrochemical properties of supercapacitor (SC) devices using semitransparent MnO2 film electrodes with or without CRE were measured and compared. The SC device without CRE shows a superior capacitance, high rate capability, and lower contact resistance. The CRE-free device could achieve a considerable volumetric capacitance of 112.2 F cm-3, resulting in a high volumetric energy density and power density of 10 mWh cm-3 and 8.6 W cm-3, respectively. For practical consideration, both flexible SC and large-area rigid SC devices were fabricated to demonstrate their potential for flexible transparent electronic application and capacitive energy-storage window application. Moreover, a solar-powered energy storage window which consists of a commercial solar cell and our studied semitransparent MnO2-film-based SCs was assembled. These SCs could be charged by the solar cell and light up a light emitting diode (LED), demonstrating their potential for self-powered systems and energy-efficient buildings.
URI: http://hdl.handle.net/10397/61404
ISSN: 1944-8244
EISSN: 1944-8252
DOI: 10.1021/acsami.6b00402
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