Polyaniline inside the pores of high surface area mesoporous silicon as composite electrode material for supercapacitors
Mesoporous silicon (mSi) obtained by the magnesiothermic reduction of mesoporous silica was used to deposit polyaniline (PANI) in its pores, the composite was tested for its charge storage application for high performance supercapacitor electrodes. The mesoporous silica as confirmed by Small Angle X...
Saved in:
| Published in: | RSC advances Vol. 12; no. 27; pp. 17228 - 17236 |
|---|---|
| Main Authors: | , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
England
Royal Society of Chemistry
07-06-2022
The Royal Society of Chemistry |
| Subjects: | |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Mesoporous silicon (mSi) obtained by the magnesiothermic reduction of mesoporous silica was used to deposit polyaniline (PANI) in its pores, the composite was tested for its charge storage application for high performance supercapacitor electrodes. The mesoporous silica as confirmed by Small Angle X-ray Scattering (SAXS) has a Brunauer-Emmett-Teller (BET) surface area of 724 m
2
g
−1
and mean pore size of 5 nm. After magnesiothermic reduction to mSi, the BET surface area is reduced to 348 m
2
g
−1
but the mesoporousity is retained with a mean pore size of 10 nm. The BET surface area of mesoporous silicon is among the highest for porous silicon prepared/reduced from silica.
In situ
polymerization of PANI inside the pores of mSi was achieved by controlling the polymerization conditions. As a supercapacitor electrode, the mSi-PANI composite exhibits better charge storage performance as compared to pure PANI and mesoporous silica-PANI composite electrodes. Enhanced electrochemical performance of the mSi-PANI composite is attributed to the high surface mesoporous morphology of mSi with a network structure containing abundant mesopores enwrapped by an electrochemically permeable polyaniline matrix.
Magnesiothermic reduction was used to reduce mesoporous silica to mesoporous silicon which can host a variety of materials such as polyaniline and has potential to be used in supercapacitors. |
|---|---|
| Bibliography: | real time (a) P (at charge density = 0.143 A g for 50 cycles on GCE in 1 M H log and (c) SBA-P (at charge density = 0.388 A g and in 1 M H vs. specific capacitance. Fig. S7: EIS (electrochemical impedance spectroscopy): Nyquist plots of (a) P, (b) SBA and (c) SBA-P electrolyte). Fig. S8: EIS (electrochemical impedance spectroscopy): Bode plots of (a) P, (b) SBA and (c) SBA-P SO OC (open circuit) at 10 mV rms AC perturbation (in 1 M H https://doi.org/10.1039/d2ra01829b i ) Electronic supplementary information (ESI) available: Polyaniline inside the pores of high surface area mesoporous silicon as composite electrode material for supercapacitors. Fig. S1: X-ray diffraction (XRD) pattern of polyaniline (P), SBA-P and mSi-P composites. Fig. S2(a): scanning electron microscopy (SEM) images of mSi, P and mSi-P composite. Fig. S2(b): energy dispersive X-ray (EDX) pattern of mSi-P composite. Fig. S3: Fourier transform infrared spectroscopy (FT-IR) of SBA (mesoporous silica), polyaniline (P) and composites (mSi-P and SBA-P). Fig. S4: cyclic voltammogram (CV) of (a) P, (b) SBA and (c) SBA-P at different scan rates on GCE in 1 M H versus SCE. Fig. S6: scan rate for the anodic and cathodic current peaks of mSi-P. Fig. S11: proposed mechanism of electrochemical reaction during charging and discharging in 1 M H 1 electrolyte). Fig. S9: galvanostatic cyclic charge-discharge (GCCD): discharge curve; potential 2 electrolyte. Fig. S10: plot of log 4 v SCE. Fig. S5: cyclic voltammetry (CV): cyclic stability of (a) P, (b) SBA and (c) SBA-P at scan rate of 20 mV s electrolyte electrolyte. See b) SBA (at charge density = 0.250 A g ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 2046-2069 2046-2069 |
| DOI: | 10.1039/d2ra01829b |