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2016 | "Capacitance enhancement in supercapacitors by incorporating ultra-lon…

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작성자 관리자 /   작성일2016-08-24 /   조회351회

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Title : Capacitance enhancement in supercapacitors by incorporating ultra-long hydrated vanadium-oxide nanobelts into graphene
Authors: Aniu Qian, Kai Zhuo, Bit Na Choi, So Jeong Lee, Jong Wook Bae, Pil J. Yoo and Chan-Hwa Chung

Journal : Journal of Alloys and Compounds
Vol/No/Page : 688/B/814-821
DOI : 10.1016/j.jallcom.2016.07.222

Abstract :
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 V2O5$0.5H2O nanobelts on surface of reduced graphene oxide (rGO). As a result, due to faster and efficient electron transfer and collection, V2O5$0.5H2O/rGO hybrid (rGO: 5 wt%e50 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 g1 at a scan rate of 5 mV s1 in a neutral KCl electrolyte. On the other hand, the hybrid material shows a high-rate capacitance of 160 F g1 at a current density of 1 A g1. 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 V2O5 0.5H2O/rGO hybrid materials and even useful for or oriented synthesis of hybrid materials in other energy storage devices.

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