Selenium Encapsulated into Metal–Organic Frameworks Derived N-Doped Porous Carbon Polyhedrons as Cathode for Na–Se Batteries,ACS Applied Materials & Interfaces

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Selenium Encapsulated into Metal–Organic Frameworks Derived N-Doped Porous Carbon Polyhedrons as Cathode for Na–Se Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-16 00:00:00 , DOI: 10.1021/acsami.7b14380
Qiuju Xu _{1,

2} , Ting Liu _{1,

2} , Yi Li _{1,

2} , Linyu Hu _{1,

2} , Chunlong Dai _{1,

2} , Youquan Zhang _{1,

2} , Yan Li ₃ , Dingyu Liu _{1,

2} , Maowen Xu _{1,

2}

Affiliation

The substitution of Se for S as cathode for rechargeable batteries, which confine selenium in porous carbon, attracts much attention as a potential area of research for energy storage systems. To date, there are no reports about metal–organic frameworks (MOFs) to use for Na–Se batteries. Herein, MOFs-derived nitrogen-doped porous carbon polyhedrons (NPCPs) have been obtained via facile synthesis and annealing treatment. Se is encapsulated into the mesopores of carbon polyhedrons homogeneously by melt-diffusion process to form Se/NPCPs composite, using as cathode for advanced Na–Se batteries. Se/NPCPs cathode exhibits excellent rate capabilities of 351.6 and 307.8 at 0.5C and 2C, respectively, along with good cycling performance with high Coulombic efficiency of 99.7% and slow decay rate of 0.05% per cycle after 1000 cycles at 2C, which result from the NPCPs having a unique porous structure to accommodate volumetric expansion of Se during discharge–charge processes. Nitrogen doping could enhance the electrical conductivity of carbon matrix and facilitate rapid charge transfer.

中文翻译：

硒封装在金属有机框架中，衍生出N掺杂的多孔碳多面体作为Na-Se电池的阴极

用硒代替硒作为可充电电池的阴极，将硒限制在多孔碳中，作为储能系统的潜在研究领域引起了广泛关注。迄今为止，还没有关于用于Na-Se电池的金属有机框架（MOF）的报道。在此，已经通过容易的合成和退火处理获得了源自MOF的氮掺杂的多孔碳多面体（NPCP）。通过熔融扩散工艺将硒均匀地封装到碳多面体的中孔中，从而形成硒/ NPCP复合材料，并用作高级钠硒电池的阴极。Se / NPCPs阴极在0.5C和2C时分别具有351.6和307.8的优异倍率能力，并具有良好的循环性能，在2C下1000次循环后，库仑效率高达99.7％，缓慢衰减率为0.05％。这是由于NPCP具有独特的多孔结构，以适应Se在放电过程中的体积膨胀。氮掺杂可以增强碳基质的电导率并促进快速电荷转移。

更新日期：2017-11-17

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