Type
ArticleKAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) DivisionElectrical Engineering Program
Functional Nanomaterials and Devices Research Group
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Sensors Lab
Date
2017-08-17Online Publication Date
2017-08-17Print Publication Date
2017-10Permanent link to this record
http://hdl.handle.net/10754/625995
Metadata
Show full item recordAbstract
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
WileyJournal
Advanced Electronic MaterialsAdditional Links
http://onlinelibrary.wiley.com/doi/10.1002/aelm.201700185/fullae974a485f413a2113503eed53cd6c53
10.1002/aelm.201700185