Capacitance enhancement in supercapacitors by incorporating ultra-long hydrated vanadium-oxide nanobelts into graphene
| Autor: | Kai Zhuo, Chan-Hwa Chung, Jong Wook Bae, Aniu Qian, So Jeong Lee, Bit Na Choi, Pil J. Yoo |
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| Rok vydání: | 2016 |
| Předmět: |
Supercapacitor
Horizontal scan rate Materials science Graphene Mechanical Engineering Metals and Alloys Oxide Nanotechnology 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance Vanadium oxide 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials law Materials Chemistry 0210 nano-technology Hybrid material |
| Zdroj: | Journal of Alloys and Compounds. 688:814-821 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.07.222 |
| Popis: | The oriented synthesis of high-performance nanobelt/graphene hybrids remains a challenge by one-step environmentally friendly process for supercapacitors. Here, PEG-6000 manipulation was employed to facilitate ultra-long V 2 O 5 ·0.5H 2 O nanobelts on surface of reduced graphene oxide (rGO). As a result, due to faster and efficient electron transfer and collection, V 2 O 5 ·0.5H 2 O/rGO hybrid (rGO: 5 wt%–50 wt%) significantly enhances electrochemical capacitance for supercapacitors. Especially, introduction of 50 wt% rGO in the hybrid (denoted as 50 wt% rGO-V) exhibits a high capacitance of 649 F g −1 at a scan rate of 5 mV s −1 in a neutral KCl electrolyte. On the other hand, the hybrid material shows a high-rate capacitance of 160 F g −1 at a current density of 1 A g −1 . Additionally, capacitance retention of 93% was obtained after 600 cycles, implying excellent cycling stability in the 50 wt% rGO-V hybrid. This study is beneficial to understand synergetic effects in V 2 O 5 ·0.5H 2 O/rGO hybrid materials and even useful for oriented synthesis of hybrid materials in other energy storage devices. |
| Databáze: | OpenAIRE |
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