Suppressing the Coffee-Ring Effect in Semitransparent MnO2Film for a High-Performance Solar-Powered Energy Storage Window

Huanyu Jin, Jiasheng Qian, Li Min Zhou, Jikang Yuan, Haitao Huang, Yu Wang, Wing Man Tang, Helen Lai Wa Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)


We introduce a simple and effective method to deposit a highly uniform and semitransparent MnO2film without coffee-ring effect (CRE) by adding ethanol into MnO2ink for transparent capacitive energy storage devices. By carefully controlling the amount of ethanol added in the MnO2droplet, we could significantly reduce the CRE and thus improve the film uniformity. The electrochemical properties of supercapacitor (SC) devices using semitransparent MnO2film 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-3and 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.
Original languageEnglish
Pages (from-to)9088-9096
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number14
Publication statusPublished - 27 Apr 2016


  • coffee-ring effect
  • energy storage
  • flexible
  • MnO film 2
  • semitransparent

ASJC Scopus subject areas

  • General Materials Science


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