Metal‐Organic‐Framework Derived Core‐Shell N‐Doped Carbon Nanocages Embedded with Cobalt Nanoparticles as High‐Performance Anode Materials for Lithium‐Ion Batteries

Abstract

To enhance the performance of Li-ion batteries, hierarchical carbon-based hollow frameworks embedded with cobalt nanoparticles are prepared by the pyrolysis of core-shell ZIF-8@ZIF-67 polyhedrals prepared via a seedmediated growth method. The resultant hollow frameworks are composed of the N-doped carbon as the inner shells and the porous graphitic carbon embedded with cobalt nanoparticles as the outer shells. Benefiting from the unique hollow architecture with large surface area and good electrical conductivity, the electrode materials exhibit good electrochemical performance with improved specific capacities, high-rate capability, and good cycling stability for Li-ion batteries. More importantly, the quantitative kinetic analysis reveals the crucial contributions of N doping and the porous structure of graphitic carbon with cobalt nanoparticles for boosting the performance of carbon-based materials. The rational design of the unique carbon-based architecture and the understanding of the underlying mechanism for the charge storage process are crucial to construct advanced carbon-based materials for high-performance Li-ion batteries.

Photo‐rechargeable batteries and supercapacitors: Critical roles of carbon‐based functional materials

“…142 Metal-organic frameworks (MOFs), the crystalline and porous materials composed of a threedimensional network of metal ions held in place by multidentate organic ligands, have been widely applied in many energy-related fields, including secondary batteries, water splitting, CO 2 reduction, and so on. [143][144][145] More importantly, MOFs can significantly improve the rate capability and the stability of integrated devices when they are introduced into electrodes of EES units, due to their abundant active sites and porous structures. 146 Besides, more kinds of carbon nanomaterials should be introduced into these integrated devices.…”

“…Phosphorene, a promising 2D nanomaterial exceeding graphene, can bring a significant efficiency improvement for integrated devices due to the adjustable bandgap with layer numbers and the high electron mobility 142 . Metal–organic frameworks (MOFs), the crystalline and porous materials composed of a three‐dimensional network of metal ions held in place by multidentate organic ligands, have been widely applied in many energy‐related fields, including secondary batteries, water splitting, CO 2 reduction, and so on 143–145 . More importantly, MOFs can significantly improve the rate capability and the stability of integrated devices when they are introduced into electrodes of EES units, due to their abundant active sites and porous structures 146 .…”

Synthesis of Tangled Iron‐Nitrogen Co‐doped Carbon Nanosheets through a Dopamine Coordination Strategy for the Oxygen Reduction Reaction

“…The global warming and energy crisis derived from the vast consumption of transitional fossil fuels accelerate the rapid development of new and clean energy storage and conversion devices. [1][2][3][4] Nevertheless, the commercial applications of new energy conversion devices including fuel cells and metal-air batteries are severely limited by the sluggish oxygen reduction reaction (ORR) arising from the high-activation barrier and hydrophobicity of O 2 . [5][6][7] At present, Platinum group metal (PGM)-based catalysts such as Pt/C are considered to be the most active ORR catalysts, but their widespread and large-scale applications are severely restricted by the high cost, scarcity and unsatisfied stability.…”

Fabrication of a Sandwich‐like VS4‐Graphene Composite via Self‐assembly for Highly Stable Lithium‐ion Batteries

“…[6][7][8][9][10] Several transitional metal sulfides (such as Co 9 S 8 , [11,12] MoS 2 , [13][14][15] and FeS 2 [16][17][18][19] ) have been recently investigated as attractive electrode materials in LIBs, because of their large lithium-ion diffusion coefficient, high theoretical capacity, and good redox reversibility behavior. [20][21][22][23][24][25][26][27][28] Vanadium sulfide also shows tremendous potential for application in LIBs as an important affiliate of the transitional metal sulfide family. [29][30][31][32][33] Moreover, it possesses myriad distinctive crystal structures with different physicochemical properties, which have a close relationship with the theoretical capacity and electronic properties.…”

“…Several transitional metal sulfides (such as Co 9 S 8 , [11,12] MoS 2 , [13–15] and FeS 2 [16–19] ) have been recently investigated as attractive electrode materials in LIBs, because of their large lithium‐ion diffusion coefficient, high theoretical capacity, and good redox reversibility behavior [20–28] . Vanadium sulfide also shows tremendous potential for application in LIBs as an important affiliate of the transitional metal sulfide family [29–33] .…”