Flexible metal-templated fabrication of mesoporous onion-like carbon and Fe2O3@N-doped carbon foam for electrochemical energy storage
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/631642
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AbstractNanostructured carbon materials have served as potent electrode materials and crucial components for energy storage; however, multi-function integration of the synthesis route is hugely challenging. Consequently, we report herein a facile and general methodology for the synthesis of multifunctional materials, specifically mesoporous onion-like carbon (OLC) and core-shell FeO@N-doped carbon hybrids, derived from water soluble gelatin and ferric nitrate precursors, which could function as high-performance electrodes for supercapacitors (SCs) and Li-ion batteries (LIBs). Owing to the strong chelation effect between the abundant functional groups of gelatin chains and metal ions, in situ-formed uniform confined nanoparticles (NPs) in a three-dimensional (3D) carbon framework could exert the triple roles of templates, graphitizing catalysts, and active materials via controllable annealing. Mesoporous OLC-3 with hollow core size of 5-8 nm, high specific surface area of 418 m g, thin shells of 3-5 graphitic layers, and rich oxygen content (18.62%) exhibited a remarkable specific capacitance (251.2 F g at 0.5 A g), surpassing most OLC state-of-the-art SC electrodes. Besides, the as-obtained core-shelled FeO@N-doped carbon annealed at 500 °C composed of a gelatin-derived carbon-coating layer (ca. 4 nm) and uniform FeO core (ca. 30 nm) greatly enhanced the rate capability (achieving an average reversible capacity of 735.9 mA h g at 0.1 A g and 480.6 mA h g at a large current density of 2 A g) and demonstrated an excellent cycling life (372 mA h g after 500 cycles at 1 A g, or 0.39 mA h g decay per cycle) for Li storage. This method is quite flexible and could be also extended to the synthesis of other metal-based functional materials.
CitationLi J, Wang N, Deng J, Qian W, Chu W (2018) Flexible metal-templated fabrication of mesoporous onion-like carbon and Fe2O3@N-doped carbon foam for electrochemical energy storage. Journal of Materials Chemistry A 6: 13012–13020. Available: http://dx.doi.org/10.1039/c8ta02417k.
SponsorsThe authors acknowledge the financial support from National Natural Science Foundation of China (NSFC, No. 21476145), the National project of 2016YFA0200102 and the Beijing key project of Z161100002116012.
PublisherRoyal Society of Chemistry (RSC)
JournalJournal of Materials Chemistry A