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Article Dans Une Revue Journal of Materials Chemistry A Année : 2015

An innovative 3-D nanoforest heterostructure made of polypyrrole coated silicon nanotrees for new high performance hybrid micro-supercapacitors

Résumé

In this work, an innovative 3-D symmetric micro-supercapacitor based on polypyrrole (PPy) coated silicon nanotree (SiNTr) hybrid electrodes has been fabricated. First, SiNTrs were grown on silicon substrates by chemical vapor deposition (CVD) and then via an electrochemical method, the conducting polymer coating was deposited onto the surface of SiNTr electrodes. This study illustrates the excellent electrochemical performance of a hybrid micro-supercapacitor device using the synergistic combination of both PPy as the electroactive pseudo-capacitive material and branched SiNWs as the electric double layer capacitive material in the presence of an aprotic ionic liquid (N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl) imide; PYR13TFSI) as the electrolyte. The hybrid device exhibited a specific capacitance as high as similar to 14 mF cm(-2) and an energy density value of similar to 15 mJ cm(-2) at a wide cell voltage of 1.5 V using a high current density of 1 mA cm(-2). Furthermore, a remarkable cycling stability after thousands of galvanostatic charge-discharge cycles with a loss of approximately 30% was obtained. The results reported in this investigation demonstrated that PPy coated SiNTr-based micro-supercapacitors exhibit the best performances among hybrid micro-supercapacitors made of silicon nanowire electrodes grown by CVD in terms of specific capacitance and energy density.
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Dates et versions

hal-01580613 , version 1 (01-09-2017)

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David Aradilla, Dorian Gaboriau, Gérard Bidan, Pascal Gentile, Maxime Boniface, et al.. An innovative 3-D nanoforest heterostructure made of polypyrrole coated silicon nanotrees for new high performance hybrid micro-supercapacitors. Journal of Materials Chemistry A, 2015, 3 (26), pp.13978-13985. ⟨10.1039/c5ta03435c⟩. ⟨hal-01580613⟩
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