1. Are tomorrow's micro-supercapacitors hidden in a forest of silicon nanotrees?
- Author
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Thissandier, Fleur, Gentile, Pascal, Brousse, Thierry, Bidan, Gérard, and Sadki, Saïd
- Subjects
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SUPERCAPACITORS , *SILICON nanowires , *CHEMICAL vapor deposition , *SEPARATION (Technology) , *THERMAL stability - Abstract
Silicon nanotrees (SiNTrs) have been grown by Chemical Vapor Deposition (CVD) via gold catalysis and a three steps process: trunks and branches growth are separated by a new gold catalyst deposition. The influence of growth conditions and the second gold catalyst deposition method on SiNTrs morphology are investigated. SiNTrs based electrodes show a capacitive behavior and better capacitance than the corresponding silicon nanowires (SiNWs) electrode. Electrode capacitance is increased up to 900 µF cm-2, i.e. 150 fold higher than for bulk silicon. Micro-supercapacitors with SiNTrs electrodes have a remarkable stability (only 1.2% loses of their initial capacitance after more than one million cycles). The use of an ionic liquid based electrolyte leads to a high maximum power density (around 225 mW cm-2) which is competitive with Onion Like Carbon based micro-supercapacitors. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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