In-situ growth of metal-organic frameworks derived CoTe2 nanoparticles@nitrogen-doped porous carbon polyhedral composities as novel cathodes for rechargeable aluminum-ion batteries
Journal of Materials Chemistry(2020)
摘要
Rechargeable aluminum-ion batteries (AIBs) have attracted widespread concern due to their high theoretical capacity, abundant aluminum resources, high safety and low cost. Nevertheless, high-capacity, long-life cathode materials are still the most fundamental pursuit of studying AIBs. In this work, we have successfully synthesized a porous crystalline zeolitic imidazolate frameworks (ZIFs) with a specific morphology and uniform size. More importantly, ZIF-67 nanocrystals can be treated as precursor to acquire CoTe2 nanoparticles@nitrogen-doped porous carbon polyhedral composities (CoTe2@N-PC) through a simple and rapid carbonization/tellurization treatment. Moreover, in-situ grown CoTe2@N-PC can well maintain the porous structure and rhombic dodecahedral morphology of the precursor. Simultaneously, the carbon matrix converted from organic ligands in ZIF-67 with abundant mesopores and large surface area can provide large electrochemically active surface and convenient charge/mass transport. And the doping of heteroatoms such as nitrogen and oxygen has been demonstrated to optimize the electronic structure and enhance conductivity. As a result, when employed as the cathode materials for AIBs with ionic liquid electrolyte of AlCl3/[EMIm]Cl, CoTe2@N-PC can deliver an ultrahigh reversible initial capacity of 635.8 mA h g–1 at a current density of 200 mA g–1, even at high discharge cut-off voltages (voltage window: 0.5¬¬–2.3 V). After 200 cycles, the discharge specific capacity is still as high as 168.6 mA g–1 and the coulombic efficiency of whole cycle exceeded 90%. What’s more, obvious discharge voltage plateaus about 1.4 V are appeared at various current densities. In summary, this work will broaden the synthesis of telluride nanoparticles with controlled morphology under low-cost, non-toxic conditions and provide a theoretical and experimental basis for the application of MOFs-derived functional materials in AIBs and other related secondary batteries.
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