Defect engineering have profound influence on the energy storage properties of electrode hybrids by adjusting their intrinsic electronic characteristics. For iron carbide based materials, however, the effect of defect (especially cation vacancies) toward their electrochemical performance are still unclear. Herein, the feasible and scalable synthesis of Fe x C@NC with 3D honeycomb-like carbon architecture and abundant Fe vacancies via template etching is reported. Such structure enable outstanding lithium-ion storage properties owing to hierarchical pores, improved intrinsic electrochemical activity, as well as the introduction of more active sites. As a result, the Fe x C@NC-2 presents a high reversible specific capacity of 1079 mAh g(-1) after 1000 cycles. Moreover, an excellent cycling stability can be achieved via maintaining a high-capacity retention (689 mAh g(-1), 98.4) over 1000 cycles at 5 A g(-1). This study provides a feasible strategy for developing high-performance hybrids with hierarchical pore and rich defects structures.
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机译：缺陷工程通过调整电极杂化物的固有电子特性，对电极的储能性能产生深远影响。然而，对于碳化铁基材料，缺陷（尤其是阳离子空位）对其电化学性能的影响尚不清楚。本文报道了通过模板刻蚀合成具有3D蜂窝状碳结构和丰富Fe空位的Fe x C@NC的可行性和可扩展性。由于多级孔、改进的本征电化学活性以及引入更多活性位点，这种结构使锂离子存储性能得以实现。因此，Fe x C@NC-2 在 1000 次循环后表现出 1079 mAh g（-1） 的高可逆比容量。此外，通过在 5 A g（-1） 下在 1000 次循环中保持高容量保持率 （689 mAh g（-1）， 98.4%），可以实现出色的循环稳定性。本研究为开发具有多级孔和丰富缺陷结构的高性能杂化物提供了一种可行的策略。
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