Designed Construction of a Graphene and Iron Oxide Freestanding Electrode with Enhanced Flexible Energy-Storage Performance

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• 作者：Meng Li ; Feng Pan ; Eugene Shi Guang Choo ; Yunbo Lv ; Yu Chen ; Junmin Xue
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 23, 2016
• 年：2016
• 卷：8
• 期：11
• 页码：6972-6981
• 全文大小：716K
• ISSN：1944-8252

文摘

In this work, a bendable graphene@iron oxide hybrid film (GFeF) electrode was fabricated through a filtration-assisted self-assembly method. Morphological characterization of GFeF revealed a uniform distribution of iron oxide nanoparticles between graphene nanosheets. Surface chemical characterization confirmed that graphene oxide in the as-prepared hybrid film was effectively reduced after thermal reduction. The electrochemical performance of a GFeF half-cell versus Li/Li⁺ exhibited high gravimetric capacity (855.2 mAh g^–1 at 0.02 A g^–1), high volumetric capacity (1949.9 mAh cm^–3 at 0.02 A g^–1), and superior cycling stability (93% capacitance retention after 500 cycles). On the basis of such a bendable electrode, a hybrid Li-ion supercapacitor that offers an operation voltage of 3.5 V and delivers a high energy density (129.6 Wh kg^–1) like a Li-ion battery combined with a high power density (1870 W kg^–1) like a supercapacitor was fabricated. In addition to the superior energy-storage capability, the as-fabricated prototype pouch cell also exhibited excellent mechanical flexibility and stable electrochemical performances under dynamic bending. The viability of such an energy-storage device provides a possible design pathway for future wearable electronics.