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    Fractal Electrochemical Microsupercapacitors

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    Type
    Article
    Authors
    Hota, Mrinal Kanti cc
    Jiang, Qiu cc
    Mashraei, Yousof
    Salama, Khaled N. cc
    Alshareef, Husam N. cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Functional Nanomaterials and Devices Research Group
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Sensors Lab
    Date
    2017-08-17
    Online Publication Date
    2017-08-17
    Print Publication Date
    2017-10
    Permanent link to this record
    http://hdl.handle.net/10754/625995
    
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    Abstract
    The first successful fabrication of microsupercapacitors (μ-SCs) using fractal electrode designs is reported. Using sputtered anhydrous RuO thin-film electrodes as prototypes, μ-SCs are fabricated using Hilbert, Peano, and Moore fractal designs, and their performance is compared to conventional interdigital electrode structures. Microsupercapacitor performance, including energy density, areal and volumetric capacitances, changes with fractal electrode geometry. Specifically, the μ-SCs based on the Moore design show a 32% enhancement in energy density compared to conventional interdigital structures, when compared at the same power density and using the same thin-film RuO electrodes. The energy density of the Moore design is 23.2 mWh cm at a volumetric power density of 769 mW cm. In contrast, the interdigital design shows an energy density of only 17.5 mWh cm at the same power density. We show that active electrode surface area cannot alone explain the increase in capacitance and energy density. We propose that the increase in electrical lines of force, due to edging effects in the fractal electrodes, also contribute to the higher capacitance. This study shows that electrode fractal design is a viable strategy for improving the performance of integrated μ-SCs that use thin-film electrodes at no extra processing or fabrication cost.
    Citation
    Hota MK, Jiang Q, Mashraei Y, Salama KN, Alshareef HN (2017) Fractal Electrochemical Microsupercapacitors. Advanced Electronic Materials 3: 1700185. Available: http://dx.doi.org/10.1002/aelm.201700185.
    Sponsors
    Research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). The authors thank the nanofabrication laboratory staff and the imaging and characterization laboratory staff at KAUST, especially Elhadj M. Diallo for their excellent support.
    Publisher
    Wiley
    Journal
    Advanced Electronic Materials
    DOI
    10.1002/aelm.201700185
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1002/aelm.201700185/full
    ae974a485f413a2113503eed53cd6c53
    10.1002/aelm.201700185
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