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High Performance Asymmetric Supercapacitor Based on Hierarchical Carbon Cloth In Situ Deposited with $h-WO_{3}$ Nanobelts as Negative Electrode and Carbon Nanotubes as Positive Electrode
| Content Provider | MDPI |
|---|---|
| Author | Lin, Jianhao Du, Xusheng |
| Copyright Year | 2021 |
| Description | Urchin-like tungsten oxide $(WO_{3}$) microspheres self-assembled with nanobelts are deposited on the surface of the hydrophilic carbon cloth (CC) current collector via hydrothermal reaction. The $WO_{3}$ nanobelts in the urchin-like microspheres are in the hexagonal crystalline phase, and their widths are around 30–50 nm. The resulted hierarchical $WO_{3}$/CC electrode exhibits a capacitance of 3400 $mF/cm^{2}$ in $H_{2}SO_{4}$ electrolyte in the voltage window of −0.5~0.2 V, which makes it an excellent negative electrode for asymmetric supercapacitors. To improve the capacitive performance of the positive electrode and make it comparable with that of the $WO_{3}$/CC electrode, both the electrode material and the electrolyte have been carefully designed and prepared. Therefore, the hydrophilic CC is further coated with carbon nanotubes (CNTs) to create a hierarchical CNT/CC electrode via a convenient flame synthesis method, and a redox-active electrolyte containing an $Fe^{2+}$/Fe$ ^{3+}$ couple is introduced into the half-cell system as well. As a result, the high performance of the asymmetric supercapacitor assembled with both the asymmetric electrodes and electrolytes has been realized. It exhibits remarkable energy density as large as 403 μW $h/cm^{2}$ at 15 $mW/cm^{2}$ and excellent cyclic stability after 10,000 cycles. |
| Starting Page | 1195 |
| e-ISSN | 2072666X |
| DOI | 10.3390/mi12101195 |
| Journal | Micromachines |
| Issue Number | 10 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-09-30 |
| Access Restriction | Open |
| Subject Keyword | Micromachines Electrochemistry Flame Catalytic Deposition Wo3 Nanobelt Cnt Redox-active Electrolyte Asymmetric Supercapacitor |
| Content Type | Text |
| Resource Type | Article |
