Title :

High performance silicon nanowires/ruthenium nanoparticles micro-supercapacitors

Author(s) :

Bencheikh, Yasmina [Auteur]
Université M'Hamed Bougara Boumerdes [UMBB]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Harnois, Maxime [Auteur]
Institut d'Électronique et des Technologies du numéRique [IETR]
Jijie, Roxana [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Addad, Ahmed [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Roussel, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Szunerits, Sabine [Auteur]
NanoBioInterfaces - IEMN [NBI - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Hadjersi, Toufik [Auteur]
Abaidia, Seddik El Hak [Auteur]
Université M'Hamed Bougara Boumerdes [UMBB]
Boukherroub, Rabah [Auteur correspondant]
NanoBioInterfaces - IEMN [NBI - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]

Journal title :

Electrochimica Acta

Pages :

150-159

Publisher :

Elsevier

Publication date :

2019-07

ISSN :

0013-4686

English keyword(s) :

Silicon nanowires
Micro-supercapacitors
Ruthenium nanoparticles
Solid-state devices

HAL domain(s) :

Chimie/Autre
Sciences de l'ingénieur [physics]/Energie électrique

English abstract : [en]

The continuous increase of small electronic devices calls for small energy storage components, commonly known as micro-supercapacitors, that can ensure autonomous operation of these devices. In this work, we propose a ...
Show more >The continuous increase of small electronic devices calls for small energy storage components, commonly known as micro-supercapacitors, that can ensure autonomous operation of these devices. In this work, we propose a simple and straightforward method to achieve high energy and power densities of a silicon-based micro-supercapacitor, consisting of silicon nanowires decorated with ruthenium nanoparticles (Ru/Si NWs). The Si NWs are obtained through the common vapor-liquid-solid (VLS) growth mechanism, while a simple electroless process is used to deposit Ru nanoparticles. While silicon nanostructuration allows to increase the surface area, coating with Ru NPs introduces a pseudocapacitance necessary to attain high energy and power densities. The Ru/Si NWs micro-supercapacitor exhibits a specific capacitance of 36.25 mF cm(-2) at a current density of 1 mA cm(-2) in a neutral Na2SO4 electrolyte and a high stability over 25 000 cycles under galvanostatic charge-discharge at 1 mA cm(-2). A solid state supercapacitor is then fabricated with symmetric electrodes separated by a polyvinyl alcohol/sulfuric acid electrolyte. The device displays a specific capacitance of similar to 18 mF cm(-2) at a current density of 1 mA cm(-2) and a specific power density 0.5 mW cm(-2). This solid-state nanowire device also exhibits a good stability over 10 000 galvanostatic charge-discharge cycles.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL