标题：Metal-organic framework-derived Co0.85Se nanoparticles in N-doped carbon as a high-rate and long-lifespan anode material for potassium ion batteries
作者：Ma, Guangyao ;Li, Chengjun ;Liu, Fan ;Majeed, Muhammad K. ;Feng, Zhenyu ;Cui, Yanhua ;Yang, Jian ;Qian, Yitai
作者机构：[Ma, Guangyao ;Li, Chengjun ;Liu, Fan ;Majeed, Muhammad K. ;Feng, Zhenyu ;Yang, Jian ;Qian, Yitai ] Key Laboratory of Colloid and Interface Chemistry, 更多
来源：Materials Today Energy
摘要：Metal-organic frameworks (MOFs)-derived metal chalcogenides/carbon, has been developed as promising anode materials for lithium/sodium ion batteries. However, they are not explored for potassium-ion batteries yet. Here, ZIF-67 is employed as a self-sacrificed template to synthesize Co0.85Se nanoparticles in N-doped carbon as an anode material for potassium-ion batteries. In this composite, N-doped carbon enhances the electron conductivity, cushions the volume change and inhibits the aggregation of Co0.85Se upon cycling. Meanwhile, mesoporous structure shortens the diffusion distance of potassium ions, as well as increases the contact between electrolyte and electrode. These features endow this composite superior performances. It delivers a specific capacity of 114.7 mA h g−1 at 1000 mA g−1 after 250 cycles. At 2.0 A g−1, the specific capacity still maintains at 110.7 mA h g−1. The electrochemical performances of full cells based on Co0.85Se@NC as an anode material are also investigated. The result greatly spurs the exploration of metal chalcogenides as anode materials for potassium ion batteries.
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