Highly Conductive Mo2C Nanofibers Encapsulated in Ultrathin MnO2Nanosheets as a Self-Supported Electrode for High-Performance Capacitive Energy Storage.
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 MnO2nanosheets 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.
State Key Laboratory for Metallic Matrix Composite Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China.
Minjie
M
Shi
State Key Laboratory for Metallic Matrix Composite Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China.
Liping
L
Zhao
State Key Laboratory for Metallic Matrix Composite Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China.
Xuefeng
X
Song
State Key Laboratory for Metallic Matrix Composite Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China.
Jing
J
Liu
State Key Laboratory for Metallic Matrix Composite Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China.
Peng
P
Zhang
State Key Laboratory for Metallic Matrix Composite Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China.
Lian
L
Gao
hybrid film; nanofiber; self-standing flexible electrode; supercapacitor; transition metal carbide