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Construction and Performance Characterization of α‑Fe2O3/rGO Composite for Long-Cycling-Life Supercapacitor Anode
journal contribution
posted on 2017-05-08, 00:00 authored by Yuanyuan Zhu, Shuang Cheng, Weijia Zhou, Jin Jia, Lufeng Yang, Minghai Yao, Mengkun Wang, Jun Zhou, Peng Wu, Meilin LiuThumb-ring-like
α-Fe2O3 and reduced
graphene oxide (rGO) composites, α-Fe2O3/rGO, have been synthesized via a simple hydrothermal method accompanied
by surface potential tuning. The obtained samples exhibit good electrochemical
performance with a wide negative potential window of −1–0.2
V vs Ag/AgCl when serving as supercapacitor electrodes. There is only
about 10% decay after 11 000 cycles of galvanostatic charge–discharge
(GCD) test. After a few tens of cycles of cycling activity, the capacitance
achieved a stable value of 255 F g–1 at 0.5 A g–1 and 174 F g–1 at 5 mV s–1; 75% of the capacitance was retained when the scan rate increased
to 200 mV s–1, indicating satisfactory power density.
Most attractively, along with cycling, the α-Fe2O3 particles begin to be well-wrapped by rGO gradually from
prior stacked structure, which is supposed to be the key factor for
the exceptional high cycling stability.
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graphene oxidePerformance Characterization11 000samples exhibitcycling stabilityGCDscan rateelectrochemical performanceα- Fe 2 O 3 particlescapacitancehydrothermal method11 000 cyclessupercapacitor electrodespower density200 mV5 mVrGOcycling activityLong-Cycling-Life Supercapacitor Anode Thumb-ring-like α- Fe 2 O 3
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