Exceptional supercapacitor performance from optimized oxidation of graphene-oxide

Li, Z., Gadipelli, S., Yang, Y. , He, Guanjie, Guo, J., Li, J., Lu, Y., Howard, C.A., Brett, D.J.L., Parkin, I.P., Li, F. and Guo, Z. (2019) Exceptional supercapacitor performance from optimized oxidation of graphene-oxide. Energy Storage Materials, 17 . pp. 12-21.

Full content URL: http://doi.org/10.1016/j.ensm.2018.12.006

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Item Type:Article
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Graphene-based materials are highly desirable for supercapacitors, but vary considerably in reported properties despite being prepared by similar procedures; therefore, a clear route to improve the performance is currently lacking. Here, a direct correlation between the initial oxidation of graphene-oxide precursors and final supercapacitor performance is demonstrated. Building on this significant understanding, the optimized three-dimensional graphene frameworks achieve a superior gravimetric capacitance of 330 F g−1 in an aqueous electrolyte. This extraordinary performance is also validated in various electrolytes at a device level. In a commercially used organic electrolyte, an excellent volumetric energy density of 51 Wh L−1 can be delivered, which significantly outperforms the state-of-the-art commercial carbon-based devices. Furthermore, solid-state supercapacitor with a gel electrolyte shows an impressive capacitance of 285 F g−1 with a rate capability of 79% at 20 A g−1 and capacitance retention of 93% after 20,000 cycles. This study presents a versatile design principle for engineering chemically derived graphene towards diverse applications in energy storage.

Additional Information:cited By 14
Divisions:College of Science > School of Chemistry
ID Code:39497
Deposited On:16 Jan 2020 16:32

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