2024-03-28T07:51:13Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1272742020-02-13T09:49:20Zcom_10261_10252com_10261_3col_10261_10253
2016-01-04T11:21:36Z
urn:hdl:10261/127274
An innovative 3-D nanoforest heterostructure made of polypyrrole coated silicon nanotrees for new high performance hybrid micro-supercapacitors
Aradilla, David
Bidan, Gérard
Gentile, Pascal
Dubal, Deepak P.
Gómez-Romero, P.
Wimberg, Jan
Schubert, Thomas J. S.
Sadki, Saïd
European Commission
Commissariat à l'Ènergie Atomique et aux Ènergies Alternatives (France)
Ministère de la Défense (France)
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 ∼14 mF cm−2 and an energy density value of ∼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.
2016-01-04T11:21:36Z
2016-01-04T11:21:36Z
2015
2016-01-04T11:21:36Z
artículo
Journal of Materials Chemistry A 3(26): 13978-13985 (2015)
http://hdl.handle.net/10261/127274
10.1039/C5TA03435C
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100006489
http://dx.doi.org/10.13039/501100005900
eng
Sí
info:eu-repo/grantAgreement/EC/FP7/309143
closedAccess
Royal Society of Chemistry (UK)