In this work, a facile and potentially scalable self-template synthesis of bi-component ZnO/ZnFe₂O₄/N-doped C micro-polyhedrons with hierarchical hollow structure (ZZFO-C) is presented. These are obtained through calcination of a single bi-metallic metal-organic framework (MOF) precursor (ZIF-ZnFe, molar ratio of 3:1). The resulting material shows a high surface area and is constituted by the organized assembly of numerous nanoparticles sub-unit (with size in the range of 20 nm). By tuning the annealing conditions, porous ZnO/ZnFe₂O₄ (ZZFO) micro-polyhedrons are obtained. The ZZFO-C composite materials are studied as anodes for LIBs exhibiting remarkable energy storage performance, such as, large reversible capacity (ca. 1000 mA h g⁻¹ after 100 cycles at 200 mA g⁻¹), excellent rate capability and cycling stability. After high-rate capacity testing (1000 cycles at 2.0 A g⁻¹), ZZFO-C shows an excellent reversible capacity of 620 mA h g⁻¹. The excellent performance of ZZFO-C arises from its unique hierarchical hollow structure and the synergy between the two active components and the N-doped carbon matrix. The electrochemical reaction mechanism and structure phase changes upon the initial lithiation are identified via in situ X-ray diffraction studies.

在这项工作中，提出了一种具有分层中空结构的双组分ZnO / ZnFe ₂ O ₄ / N掺杂C微多面体的简便且可能可扩展的自模板合成（ZZFO-C）。这些是通过煅烧单个双金属金属有机骨架（MOF）前体（ZIF-ZnFe，摩尔比为3：1）获得的。所得材料显示出高表面积，并且由许多纳米颗粒亚单元（尺寸在20 nm范围内）的有组织的组装构成。通过调节退火条件，获得了多孔ZnO / ZnFe ₂ O ₄（ZZFO）微多面体。研究了ZZFO-C复合材料作为锂离子电池的阳极，锂离子电池具有出色的储能性能，例如大可逆容量（约1000 mA h g在200 mA g ^{-1的条件下}经过100次循环后^-1），具有出色的倍率能力和循环稳定性。经过高容量测试（在2.0 A g ^-1下进行1000次循环）后，ZZFO-C显示出620 mA h g ^-1的出色可逆容量。ZZFO-C的出色性能源于其独特的分层空心结构以及两个活性成分与N掺杂碳基体之间的协同作用。初始锂化后的电化学反应机理和结构相变是通过原位X射线衍射研究确定的。