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Highly Conductive Mo2C Nanofibers Encapsulated in Ultrathin MnO2 Nanosheets as a Self-Supported Electrode for High-Performance Capacitive Energy Storage
- Shi, Minjie, Zhao, Liping, Song, Xuefeng, Liu, Jing, Zhang, Peng, Gao, Lian
- ACS Applied Materials & Interfaces 2016 v.8 no.47 pp. 32460-32467
- additives, capacitance, carbides, crosslinking, durability, electrical charges, electrochemistry, electrodes, electrolytes, energy, films (materials), ionic liquids, manganese dioxide, molybdenum, nanofibers, nanosheets
- Nanostructured transition metal carbides (TMCs) with superior electrochemical properties are promising materials for high-efficiency energy-storage applications. Herein one-dimensional molybdenum carbide nanofibers (Mo₂C NFs) have been fabricated by a facile and effective electrospinning strategy. Based on the cross-linked network architecture with ultrahigh electronic conductivity, each Mo₂C NF is uniformly encapsulated in lamellar manganese dioxide (MnO₂) via electrodeposition, forming a self-supported MnO₂–Mo₂C NF film with excellent electrochemical activity. Remarkably, the highly conductive inner layer of porous Mo₂C NFs acts like a “highway” to facilitate charge transport and ionic diffusion, while the MnO₂ nanosheets with abundant active area are favorable for the accumulation of effective electric charges. Benefiting from these features, the hybrid film is directly applied as the self-standing electrode of supercapacitors (SCs) without any additives, which delivers considerably large specific capacitance with strong durability in both aqueous and organic (ionic liquid) electrolytes. This work elucidates a feasible way toward heteronanofiber engineering of TMCs on a promising additive-free electrode for flexible and high-performance SCs.