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Metal-Assisted Electrochemical Nanoimprinting of Porous and Solid Silicon Wafers
Published on: February 8, 2022
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High-performance solid state supercapacitors assembling graphene interconnected networks in porous silicon electrode
Cosmin Romanitan1,2, Pericle Varasteanu1,2, Iuliana Mihalache1
1National Institute for Research and Development in Microtechnology (IMT-Bucharest), 126A Erou Iancu Nicolae Street, 077190, Voluntari, Romania.
Scientific Reports
|June 27, 2018
Summary
Researchers developed a scalable silicon-based supercapacitor technology using graphene derived from 2,6-dihydroxynaphthalene. These solid-state supercapacitors (SSC) exhibit high energy and power density, comparable to leading carbon-based devices.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Conformal modification of nanoporous silicon's internal surface presents significant challenges.
- Developing advanced energy storage materials is crucial for high-performance devices.
Purpose of the Study:
- To create a scalable technology for solid-state supercapacitors on silicon.
- To investigate the electrochemical properties of graphene-modified nanoporous silicon.
Main Methods:
- Electrochemical polymerization of 2,6-dihydroxynaphthalene on nanoporous silicon via cyclic voltammetry or potentiometry.
- Thermal treatment at 800°C under N2 atmosphere for 4 hours.
- Fabrication and testing of symmetric supercapacitors (SSC).
Main Results:
- Formation of interconnected graphene networks strongly adhering to the nanoporous silicon matrix.
- Achieved excellent electrochemical properties in the fabricated SSCs.
- Demonstrated high specific capacity, enhanced retention at ultra-high rates (5 V/s sweep, 100 A/g discharge), and good cycling stability (10 A/g).
Conclusions:
- The developed technology offers a scalable route to high-performance silicon-based supercapacitors.
- Cyclic voltammetry approach yielded superior electrode performance due to better substrate coverage and resilience.
- The graphene-nanoporous silicon hybrid electrodes show promise for advanced energy storage applications.
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